Proceedings of the Fifth Asian Regional Maize Workshop - Search ...

More documents

Recommendations

Info

Horner, E.S., E. Magloi re, and J .A. Morera. 1989. Comparison of selection of S2 progeny vs. testcross performance for population improvement in maize. Crop SCi. 29:868-874. Hull, F.H. 1945. Recurrent selection and specific combining ability in corn. J. Am. soc. Agron. 37:134-145. tlJll, F.H. 1952. Recurrent selection and overdominance. p. 451-473. In J.W. Gowen (ed.) Heterosis. Iowa State univ. Press. Ames, IA. Iglesias, C.A., and A.R. Hallauer. 1991. Response to S2 recurrent selection in exotic and semiexotic populations of maize (Z8a IRIJYS L.). J. Iowa Acad. SCi. 98:4-13. Jenkins, M.T. 1935. "rhe effect of inbreeding and ,selection within inbred lines of maize upon hybrids made after successive generations of selfing. Iowa State COllege J. SCi. 9:429 450. Jenkins, M.T. 1940. The segregation of genes affecting yield of grain in maize. J. Am. soc. Agron. 32:55-63. Jenkins, M.T. 1978. Maize breeding during the development and early years of hybrid maize. p. 13-28. In D.B. Walden (ed.) Maize Breeding and Genetics. John Wiley and Sons. New York. Jenkins, M.T., and A.M. Brunson. 1932. Methods of testing inbred lines in crossbred combinations. J. Am. SOC. Agron. 24: 523-530. Keeratinijaka1, V., and K.R. Lamkey. 1993. Responses to reciprocal recurrent selection in BSSS and BSCB1 maize populations. Crop SCi. 33:73-77. Klenke, J.R., W. A. Russell, and W.O. Guthrie. 1986. Recurrent selection for resistance to European corn borer in a corn synthetic and correlated effects on agronomic traits. Crop SCi. 26:864-868. Lamkey, K.R., and A.R. Hallauer. 1984. Comparisons of maize populations improved by recurrent selection. Maydica 29:357-374. Lonnquist, J.H. 1964. A modification of the ear-to-row procedure for the improvement of maize populations. Crop SCi. 4:227-228. Mang1esdorf, P.C. 1974. COrn: Its Origin, Evolution, and Improvement. Harvard Univ. Press. cambridge, MA. Moll, R.H., and H.F. Robinson. 1966. Observed and expected response in four selection experiments in maize. Crop SCi. 6:319-324. Rawlings, J.O. 1970. Present status of research on long and short term recurrent selection in finite popu1ations--choice of population size. Proc. second Meet. Work. Group Quant. Genet., sect. 22. IUFRO, Raleigh, N.C. p. 1-15. Russell, W.A. 1991. Genetic improvement of maize yields. Adv. Agron. 46:245-298. Shull, G.H. 1909. A pure-line method in corn breeding. Am. Breeders' Assoc. Rep. 5: 51-59. smith, J.S.C. 1988. Diversity of United States hybrid maize germp1asm: Isozymic and chromatographic evidence. Crop SCi. 28:63-69. smith, O.S., A.R. Hallauer, and W.A. Russell. 1981. Use of selection index in recurrent selection in maize. Enphytica 30:611-618. Sprague, G.F. 1946. Early testing of inbred lines. J. Am. Soc. Agron. 38:108-117. Sprague, G.F., and L.A. Tatum. 1942. General vs. specific combining ability in single crosses of corn. J. Am. Soc. Agron. 34:923-932. Tanner, A.H., and O.S. smith. 1987. Comparison of half-sib and 51 recurrent selection in Krug Yellow Dent maize populations. Crop SCi. 27:509-513. Williams, P.N., and F.M. Davis. 1983. Recurrent selection for resistance in corn to tunneling by the second-brood southwestern corn borer. Crop SCi. 23:169-170. Questions to the author: FFOt: C. De Leon a Most programs in lowlands are trying to "tropicalize" temperate lines. However, you are going "the other way" by selection for lowland tropical germplasm adapted in your temperate conditions. Would you suggest to continue tropical izing the temperate adapted 1ines, or go 176
straight and select for good combining lines extracted from tropical germplasm? A Yes, I would certainly continue to adapt temperate lines to tropical conditions. Widely used temperate lines have had extensive selection for high, stable performance by the recycling of lines in elite by elite line crosses. At Iowa State University, we have adopted tropical lowland germplasm to temperate conditions with intense mass selection (500 plants) in large populations. Everett Gerrish, however, also was effective in adapting tropical germplasm to temperate areas by crossing and backcrossing to elite lines. I feel the reverse situation can be done (and should be done to capture the superior alleles of temperate lines), but it may be more difficult because of the disease and insect pressures of the tropical environments. The disease pressures experienced by tropical germplasm enhances their potential value in temperate areas. Because temperate lines have not been exposed to the disease and insect pressures of the tropics, more intercrossing between cycles of backcrosses may be needed to pyramid the necessary levels of resistance. But it can be done. FROM: E. R. Bautista Q In hybrid maize development, which should be given more emphasis, heterotic pattern or combining ability values? Is there any relationship between the two which could be used as a good basis in hybrid maize development? A Heterotic patterns vs general combining ability are two different issues. Assume we are interested in identifying a heterotic pattern among 10 populations of maize. We could produce a diallel set of 45 crosses among the 10 POPUlations. We evaluate the 10 populations and 45 populations crosses in replicated experiments conducted in different environments, analyze the data, and estimate the general (GCA) and specific (SCA) combining ability effects for the populations and population crosses, respectively. GCA effects are the average performance of a parent in crosses and are due to primarily additive genetic and additive x additive epistatic effects. A significantly positive estimate of GCA for a parent indicates the parent had above average performance in crosses. A significantly positive estimate of SCA effects indicates that the specific cross exceeded the expected, based on the average performance of the parents, or GCA, i.e. non additive effects were expressed in the cross. This does not mean that a parent with good GCA will not have good SCA with one specific parent. Iowa Stiff Stalk Synthetic (BSSS) is a good example: BSSS has good GCA with other populations but it also has good SCA with Lancaster Sure Crop. A Significantly positive SCA effect suggests a possible heterotic pattern, but one must be careful because the one parent may have poor performance per se. Generally, populations with good GCA also can have good SCA with other populations; the reverse situation of high SCA for a specific pair may not indicate good GCA with other parents. FROM: S. J. Patil Q In the population improvement or maintenance how often you advise the introgression of new variability? A I feel that populations under selection to develop germplasm for breeding programs should be open-ended populations, but the introgression of new genetic materials in the populations has to be considered very carefully. Presumably, selection has been effective for increasing the frequency of desirable alleles in the populations for the trait(s) considered in selection. Hence, it seems genetic variability was reduced. If we introgress other materials into the selected population, we do not want to dilute the previous progress from selection. If other germplasm sources are introduced into a selected population, we would want to ensure that the new genetic variability will not regress the previous gains. If information from other studies suggest that other germplasm could enhance the' selected population; then it would be appropriate to introgress the other germplasm source into the selected population. FROM: M. Dahlan Q In recurrent selection, the progeny is evaluated say in 3 very different environments. There is high genotype by environment interaction, therefore difficult to select families with good yield in all environment. How do you select the families for intercrossing? A You will need to identify your target environments. It seems that if selection and 177
Page 2 and 3:
Proceedings of the Fifth Asian Regi
Page 4 and 5:
Page Foreword List of participants
Page 6 and 7:
For several years, the Asian countr
Page 9 and 10:
LAOS MALAYSIA MYANMAR NEPAL PAKISTA
Page 11 and 12:
Chamnan Chutkaew Dept. of Agronomy
Page 13 and 14:
I t· PRIVATE PRIVATE SECTOR: SECTO
Page 15 and 16:
Pioneer Overseas Corp. ProAgro Seed
Page 17 and 18:
MP COP NGOs TK = Muriate of Potash.
Page 19 and 20:
Table 3. Land suitability for maize
Page 21 and 22:
Depending on how this wheat is rele
Page 23 and 24:
Individual field sizes in the GKF a
Page 25 and 26:
Table 12. Demonstration block resul
Page 27 and 28:
alance of composite, synthetics and
Page 29 and 30:
Elias, S.M., F.S. Sikder and J.Ahme
Page 31 and 32:
~IZE ItAIMJ4ENT PRXJW4ME IN IHlf'AN
Page 34 and 35:
3. Low level of soil fertility. Exp
Page 36 and 37:
3. Farmers could not afford to purc
Page 38 and 39:
Table 1. Hybrid maize production in
Page 40 and 41:
100,000 mu (1 ha = 15 mu). Fran 198
Page 42 and 43:
+ The planting area of inbred line
Page 44 and 45:
ty levels. Selection interia should
Page 46 and 47:
Dao13, Oa19, SSE232 etc.). b. combi
Page 48 and 49:
~ZE I~ IN IN>IA - AN OVERVIEW WITH
Page 50 and 51:
inbred 1ines possessing good genera
Page 52 and 53:
Table 3. Details of medium and earl
Page 54 and 55:
increasing the yield levels of the
Page 56 and 57:
Production of ~zygous diploid inbre
Page 58 and 59:
EntQllOlogical research. In the fie
Page 60 and 61:
A 1) OUr coordinated efforts for ma
Page 62 and 63:
Table 1. Maize area harvested, proW
Page 64 and 65:
Table 4. Grain yield of Semar 1 and
Page 66 and 67:
ut they have been selecting ears fr
Page 68 and 69:
MAIZE ~ N«J ~ION IN LAOS. Kanyavon
Page 70 and 71:
to rice in order to reach self-suff
Page 72 and 73:
0\ 0\ ."'0- ~I.u'. u: 0 50 100 STAT
Page 74 and 75:
. According to the findings of the
Page 76 and 77:
IR:EDIIIG IHJ N:RHJotIC RESEAfDI C
Page 78 and 79:
tion with estate or mini-estate typ
Page 80 and 81:
Table 4. MYR grain maize yields ove
Page 82 and 83:
techniques. References Anonymous. 1
Page 84 and 85:
Table 1. Total area under maize and
Page 86 and 87:
Year Township Area planted Total pr
Page 88 and 89:
cover, short plant stature, and sat
Page 90 and 91:
Table 3. Res.Stat. Multilocational
Page 92 and 93:
3. Plant protection: a. Diseases Th
Page 94 and 95:
Questions to the author: FROM: S. K
Page 96 and 97:
were unacceptable in some parts due
Page 98 and 99:
Table 2. CCRI maize hybrid yield tr
Page 100 and 101:
HYBRID MAIZE BREEDlt.G AN> ALH»DII
Page 102 and 103:
of highly productive technologies,
Page 104 and 105:
Maize varietal improvement continue
Page 106 and 107:
Peronosc lerospora phi 1ippinensis
Page 108 and 109:
elow to help clarify the farm level
Page 110 and 111:
Premium Grade (emulsifiable concent
Page 112 and 113:
support. The versatile planter/fert
Page 114 and 115:
Table 1. Climatic conditions in the
Page 116 and 117:
T1l1t:i----------------------------
Page 118 and 119:
the maha season. Yala season is cha
Page 120 and 121:
. Spacing Blackgram Maize 40 em x 5
Page 122 and 123:
Sri Lanka. Ariyanayagam, R. P. 1967
Page 124 and 125:
It took almost 10 years to develop
Page 126 and 127:
g; CUS0 4 (5H 2 0): 0.39 g; NaF: 0.
Page 128 and 129:
3. Making single cnosses: Plant the
Page 130 and 131:
experiments showed that the fertili
Page 132 and 133: Long term evaluation of mass releas
Page 134 and 135: Chang, S.C., and Y.Z. Wu. 1976. Pra
Page 136 and 137: DEVELCHENT OF HYBRID ~ IN THAILAN>
Page 138 and 139: Table 2. Quantity and value of Thai
Page 140 and 141: was approved by KU and OOA in 1991
Page 142 and 143: Table 8. Mean yields of fresh dehus
Page 144 and 145: 4. Prevention and control of aflato
Page 146 and 147: Table 17. Mean grain yield and agro
Page 148 and 149: Sittipanuwong, S., C. Chutkaew, A.
Page 150 and 151: Early rainy season plantings have a
Page 152 and 153: P. R.CHINA TMilAKD CAMPUCHiA
Page 154 and 155: In 1992, the hybrid maize acreage i
Page 156 and 157: organizing visits as well as field
Page 158 and 159: Table 1 Area, production and yield
Page 160 and 161: plants per hill) 4. Intercropping e
Page 162 and 163: VIEl1'W4 YELLOW MAIZE EXRRT: MARKET
Page 164 and 165: 6,------------------~3,5 Producllon
Page 166 and 167: MAIZE BREEDUG Arnel R. Hallauer-L!
Page 168 and 169: method was provi ded by Eberhart (1
Page 170 and 171: can vary by the complexity of inher
Page 172 and 173: Table 3. Response to selection for
Page 174 and 175: Table 5. Comparative responses for
Page 176 and 177: increased response for grain yield.
Page 178 and 179: Sure Crop (0h43 and C103). several
Page 180 and 181: Sprague and Tatum (1942) demonstrat
Page 184 and 185: evaluation are conducted in only on
Page 186 and 187: Table 1. Maize: Production Unit 100
Page 188 and 189: Table 3. Maize: Area harvested Unit
Page 190 and 191: v) Incentives to private sector are
Page 192 and 193: possible through adoption of suitab
Page 194 and 195: will be described highlighting thos
Page 196 and 197: will fluctuate. As a general rule,
Page 198 and 199: help of maize breeders from the nat
Page 200 and 201: Table 4. Possible heterotic partner
Page 202 and 203: use as OPVs and broad based synthet
Page 204 and 205: c. Integrat;on of populat;on ;mprov
Page 206 and 207: Table 8. Announced CIMMYT lines 199
Page 208 and 209: HYBRID MAIZE ~ 1l£ SMALL-SCALE FNI
Page 210 and 211: Table 2. Growth rate of maize area
Page 212 and 213: At the same time that CIMMYT was sh
Page 214 and 215: when grown under farmers' condition
Page 216 and 217: seed often varies substantially bec
Page 218 and 219: kilograms of maize grain that must
Page 220 and 221: Table 8. COst of producing, process
Page 222 and 223: case in which the hybrid replaces a
Page 224 and 225: J i-----1'-_.,-_I........ i M*iIBia
Page 226 and 227: egions which do not allow a suffici
Page 228 and 229: participation; where foreign compan
Page 230 and 231: Wellhausen, E.J. Walden (ed.) 1978.
Page 232 and 233:
To recover value, seed companies ca
Page 234 and 235:
In recent years, many new companies
Page 236 and 237:
nology and its reliance on patents,
Page 238 and 239:
Table 6. Intellectual property righ
Page 240 and 241:
for crop improvement programs. It i
Page 242 and 243:
capabi 1ities Despite these constra
Page 244 and 245:
TftNlAlll CAMPUCI-1iA Fig. 1. Seven
Page 246 and 247:
* Yield potential of 8.0 t/ha. II.
Page 248 and 249:
CAOOILL MAIZE RESEAFDI ACTIVITIES I
Page 250 and 251:
RESEARCH AN> POTENTIAL OF HYBRID (X
Page 252 and 253:
ClBA SEEDS IN SJJ11£AST ASIA. Jose
Page 254 and 255:
ACTIVIlY OF MAHYOO IN INJIA Rajendr
Page 256 and 257:
PACIFIC SEEDS - PlANT ~ FOO ASIA Pe
Page 258 and 259:
Questions to the author: FROM: R. S
Page 260 and 261:
Just start In 1980 the demonstratio
Page 262 and 263:
VOLUME 1000 IQnt/ 10.--------------
Page 264 and 265:
(Notes by Dr. V.L. Chidley, Raporte
Page 266:
1. Rhizoctonia leaf and sheath blig
show all

Proceedings of the Fifth Asian Regional Maize Workshop - Search ...

You also want an ePaper? Increase the reach of your titles

Delete template?

Save as template?