Rice Genetics IV - IRRI books - International Rice Research Institute

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S. Wessler, unpublished data). Other DNA element families, including Ac/Ds andMutator, also target genic, low-copy regions by a mechanism that has yet to be described(Chen et al 1992, Cresse et al 1995). It is intriguing that these previouslycharacterized class 2 elements have not apparently given rise to MITEs. The maizeDs1 element resembles MITEs in size and structure. However, like the rest of the Ac/Ds family, it has a very low copy number (
MITEs as a source of allelic diversity in maize and riceThrough numerous studies, a great deal has been learned about the comparative structureof the genomes of members of the grass clade including rice, sorghum, maize,and wheat (reviewed in Bennetzen 2000). The take-home message from these studiesis that grass genomes are highly conserved for coding exon sequences and gene orderbut completely different for the presence or absence of TEs at particular loci (definedherein as TE-insertion site polymorphism). This situation has led to speculation thatTEs play a major role in creating the variation that fuels speciation in the grass clade(Zhang et al 2000).This hypothesis cannot be tested through intergeneric comparisons or by decipheringthe complete genome sequence of one strain. Although such studies are criticalto understanding gene function, they do not reveal how genes or genomes evolve.To address evolutionary questions, it is necessary to first quantify the extent of TEinsertionsite polymorphism between members of the same species and then to determinewhether this polymorphism is functionally significant and/or generated in responseto external cues. To understand the contribution of MITEs to the creation ofallelic diversity, we are focusing on MITEs that have recently spread through thegenome in maize and rice. Two features distinguish such MITEs: they have highwithin-family sequence identity (usually >90%) and their insertion sites are highlypolymorphic within the species.Several recently amplified MITEs in maizeThe first member of the MITE family, Hbr, was isolated from a mutant allele of themaize HM1 disease resistance gene (Johal and Briggs 1992). Subsequent studies revealedthat there are about 3,000–4,000 Hbr elements in maize with more than 90%sequence identity (Zhang et al 2000). Although the majority of the maize genomecontains moderate to highly repetitive DNA, randomly chosen Hbr elements are predominantlyin single or low-copy genic regions. Preliminary studies have identifiedthree additional maize MITE families each with more than 5,000 copies per haploidgenome, with more than 90% sequence identity, and with target site preference: B2-Tourist (Bureau and Wessler 1992, N. Jiang and S. Wessler, unpublished data), mPIF(Walker et al 1997, X. Zhang, Q. Zhang, and S.Wessler, unpublished data), and Hb2(Spell et al 1988, Z. Magbanua and S. Wessler, unpublished data).Transposon display: assaying TE polymorphismMITE-transposon display (MITE-TD) is a modification of the amplified fragmentlength polymorphism (AFLP) technique and the transposon display technique (Vos etal 1995, Van den Broeck et al 1998) that permits the simultaneous detection of manyMITEs from high copy number lines. Unlike conventional AFLP products that aredelimited by two restriction sites, one restriction site (usually Mse1 or Bfa1) and aMITE delimit MITE-TD polymerase chain reaction (PCR) products. MITE-TD hasbeen applied to several MITEs from maize including Hbr (Casa et al 2000). As withAFLP, the segregation of a MITE product that is present in the parent of one mappingMiniature inverted repeat transposable elements . . . 111
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Retrotransposons of rice as a tool
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First, the Rice Genetics Cooperativ
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OverviewRice genetics from Mendel t
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Rice genetics from Mendelto functio
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nese cultivar Nipponbare. The chrom
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Gene symbolization in riceIn the ab
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Table 2. Some examples of mapping g
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and YAC libraries, respectively. Th
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gene from wild species is the intro
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ReferencesAbbasi FM, Brar DS, Carpe
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Nagao S. 1951. Genic analysis and l
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Yoshimura S, Yamanouchi U, Katayose
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important traits for which segregat
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trolled by a single recessive gene,
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AromaAromatic rice varieties often
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Submergence tolerance is an interes
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Kinoshita T, Maekawa M. 1986. Genet
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NotesAuthors’ addresses: J.N. Rut
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The Rockefeller Foundation has a lo
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Evolution and implementation of the
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Scientific progress and outputsIn t
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Another salient example is that of
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BOX NO. 1recent international works
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For the purposes of this discussion
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Because of the great diversity (sci
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eeders where final products to enha
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Chen S, Lin XH, Xu CG, Zhang Q. 200
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Toenniessen GH. 1998. Rice biotechn
Page 73 and 74: Molecular markers,genetic diversity
Page 75 and 76: Evolution and domestication of rice
Page 77 and 78: ABCDO. barthiiO. rufipogonO. longis
Page 79 and 80: Wild(O. rufipogon)Geographical diff
Page 81 and 82: South Asia (particularly on the wes
Page 83 and 84: al 1992, Sun et al 1996a,b,c), thou
Page 85 and 86: wild and cultivated types (Est10, W
Page 87 and 88: Cai HW, Morishima H. 2000a. Diversi
Page 89: Sato YI, Tang SX, Yang LU, Tang LH.
Page 92 and 93: The solid base laid by classical ri
Page 94 and 95: The synthesis shown in Figure 1 is
Page 96 and 97: Arabidopsis, long heralded as a “
Page 98 and 99: Monocots and eudicots: Is there sti
Page 100 and 101: Zhang H, Jia J, Gale MD, Devos KM.
Page 102 and 103: ility of rice productivity (Lu 1999
Page 104 and 105: Table 1 continuedIntrageneric class
Page 106 and 107: Molecular markers and evolutionary
Page 108 and 109: A100100521010078100991009894100O. s
Page 110 and 111: Two distinct types of sequences wer
Page 112 and 113: arthii and O. longistaminata, and t
Page 114 and 115: testing Ka/Ks between the homeologo
Page 116 and 117: Roschevicz RI. 1931. A contribution
Page 119 and 120: Miniature inverted repeattransposab
Page 121: eau and Wessler 1992, 1994), rice (
Page 125 and 126: ATIR Olo-D* Olo-CTIRBCas Exp Wan Sn
Page 127 and 128: Le QH, Wright S, Yu Z, Bureau T. 20
Page 129 and 130: Microsatellite markers in rice:abun
Page 131 and 132: make the best SSR markers for rice.
Page 133 and 134: Predicted frequency100,00080,000Cla
Page 135 and 136: Relationship between SSRs and genes
Page 139 and 140: are indicated with RM locus designa
Page 141 and 142: SSRs have been used to define intro
Page 143 and 144: provide a bridge for moving rapidly
Page 145 and 146: Ishii T, McCouch SR. 2000. Microsat
Page 147: NotesAuthors’ addresses: S.R. McC
Page 150 and 151: traits of economic importance (Mack
Page 152 and 153: Table 2. Tagging and mapping of som
Page 154 and 155: even at the juvenile stage. Several
Page 156 and 157: Chen et al (2000) transferred the b
Page 158 and 159: genome sequence of rice, this will
Page 160 and 161: Kurata N, Nagamura Y, Yamamoto K, H
Page 162 and 163: Witcombe JR, Hash CT. 2000. Resista
Page 165 and 166: QTL mapping in rice:a few critical
Page 167 and 168: M-QTLsM-QTLs are defined as single
Page 169 and 170: (genetic/statistical models and cor
Page 171 and 172: Table 5. The percentage of three ty
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Table 7. Some environment-specific
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ferently to the environments. Simil
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(case 3), one may infer that this g
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Simultaneous QTL introgression and
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Doebley J, Stec A, Gustus C. 1995.
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Visscher PM, Haley CS, Thompson R.
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unavailable until recently with the
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Table 1 continued.Trait QTL a Flank
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the remaining parts of the linkage
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Table 3. QTLs detected for yield an
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Table 6. Correlations of various pa
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The functions of these sequences ne
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Structural and functional genomicsT
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The International Rice GenomeSequen
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the RGP, a PAC (P1-derived artifici
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Progress of sequencing in the RGPWe
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ice genome sequencing to organize a
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Strategies and techniquesfor finish
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uses the quality values generated b
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with the advanced techniques requir
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times contain sufficient data to ma
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amplification of regions that previ
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4. Structure problems—subcloning
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estriction maps or optical maps are
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nal assembly may point to areas tha
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McMurray AA, Sulston JE, Quail MA.
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Sequence-tagged connector/DNA finge
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1999). The development of multiple-
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Transposable elements in the rice H
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ers, maps, mapping populations, and
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Miropeats-OSJNBa0065H03 1.2 cMThres
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NotesAuthors’ addresses: R.A. Win
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Sasaki 1997). Such analysis is ofte
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ABNipponbare × KasalathF 2QTL anal
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were classified into two groups bas
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effective at determining the genoty
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addition, some accessions of wild r
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Sasaki T, Burr T. 2000. Internation
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Mutational analysis has long been t
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marked by a deletion/chromosomal re
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analysis suggests that the mutation
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For drought-response screening, our
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Pi-7(t)Xa21Xa10Xa3Xa4Pi-1(t)Pi-k, P
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Although mutants with discrete gene
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Generation of T-DNA insertionaltagg
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Aprobe AEEprobe BpGA1633RBgus Tn p3
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Number of loci36%224%170%010 20 30F
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Table 2. GUS assay in roots of tran
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1999, Krysan et al 1999, Sato et al
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Transposons and functionalgenomics
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cesses. To study the interactions a
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Constructs were made with the aim o
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RBcis-effect of the adjacent strong
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Ac knockout mutagenesisThe Ac lines
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Table 2 summarizes the transformati
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ReferencesBaldwin D, Crane V, Rice
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NotesAuthors’ addresses: R. Greco
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These include T-DNA (Azpiroz-Leehan
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polyproteins and two identical 138-
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mutant. The mutation in the ent-kau
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primers (G1, G2) and two Tos17-spec
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of insertion mutants by sequencing
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Grandbastien M-A, Spielman A, Caboc
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NotesAuthors’ addresses: H. Hiroc
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human endeavor, greatly contributed
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Equally important as the genomic in
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Oryzabase is one of the most recent
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Database structureA characteristic
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types of users. An annotation datab
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ReferencesAntonio BA, Fang Z, Sanch
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Gene isolation and functionEnhancin
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Enhancing deployment of genes forbl
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mochi and Tsuyuake (Wu et al 1996).
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tive indica rice varieties supports
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transcription factor, resulting in
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facilitate breeding durable resista
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(Inukai et al 1994, Yu et al 1996,
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Rossman AY, Howard RJ, Valent B. 19
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Molecular signaling in diseaseresis
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AOsRac1IED II III IV 214aaOsRac1 KC
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Japonica rice variety Kinmaze, whic
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Table 1. Characteristics of lesion-
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an effective inducer of host resist
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Takahashi A, Kawasaki T, Henmi K, S
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et al 2000). Sequence analysis of t
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612-amino acid protein, including t
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Genetic dissection of the Xa21-medi
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ReferencesAnderson PA, Lawrence GJ,
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Isolation of candidate genesfor tol
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Materials and methodsPlant material
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Microarray hybridization and data a
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Table 3. Most abundant transcripts
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Microarray technologyThe rapid accu
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view of procedures, pitfalls, and n
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Log(2) ratio1.51.0OC104E01—WCP1OC
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Table 5. Strongly regulated transcr
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ReferencesAdams MD, Soares MB, Kerl
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Acknowledgments: We thank Chris Bor
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y cells separating during tissue de
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(Erwee and Goodwin 1983). The sympl
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tion between the abundance of CDK t
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in a complex of 105 kDa. These resu
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Drew MC, Jackson MB, Giffard S. 197
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Umeda M, Umeda-Hara C, Yamaguchi M,
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asexual reproduction through apomix
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MPManual pollination by breeders×
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Search for apomixis in riceThere ar
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Issues related to achieving synthet
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come and may use imprinting to achi
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Embryo-inducing geneInactive ablati
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M 1 3 3 4 5 6 7 8 9 10 11 12 13 14
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embryos, several genes characterist
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Our search for a rice homologue of
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sequenced the two rice DMC1 genes a
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Gustine DL, Sherwood RT, Huff DR. 1
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Peel MD, Carman JG, Leblanc O. 1997
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TransformationEngineering for virus
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Engineering for virusresistance in
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proteins, (2) the expression of dys
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Antisense and cosuppression RNA. Ex
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Table 1. Transgenic rice with patho
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the disease symptoms. Efforts from
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an ambisense coding strategy (Fig.
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first produced and shown to have vi
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McLean GD, Evans G. 1997. Some pote
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Waterhouse PM, Upadhyaya NM. 1998.
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duction in response to dehydration
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(KIKEKLPG) in the carboxyl terminus
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These three plasmids were used to t
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We now show the effects of the toba
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Since one major goal of plant scien
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Table 4. Copy number of transgenes
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Chan M-T, Chang H-H, Ho S-L, Tang W
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NotesAuthors’ address: Department
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initially fixed by phosphoenolpyruv
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High-level expression of maize C 4-
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The effect of illumination on PPDK
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ate in 2% O 2 can be limited by Pi
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Transgene integration,organization,
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duced by organogenesis, somatic emb
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ing transgene organization. FISH an
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ments and the integration of exogen
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Level 2: activation of local repair
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strongly suggested that plant facto
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other cases it was not. We observed
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Gorbunova V, Levy AA. 1997. Non-hom
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Gene silencing and itsreactivation
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Carbofuran (trade name, Furadan) is
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Akb4xHpaIIJKA52 (R 0)52-6 (R 1)52-9
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ABCDhptuidAmUbi1kb10.08.05.04.13.0F
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Fig. 4. X-gluc staining of germinat
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eflect different causes for silenci
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Table 4. Suppressors of silencing f
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Garrick D, Fiering S, Martin DI, Wh
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Xu Y, Buchholz WG, DeRose RT, Hall
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Rice molecular breeding workshopThi
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the working group can develop a net
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Rice genetics cooperativeA meeting
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