Effects of reduced plant height on breeding requirements and ...

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that, despite dlfferences i_n coleoptile length, the senidwarfs were capable <strong>of</strong> emerging as well as the talls. tauti.on should be observed. Ín drawing conclusions from these results since the study was carrfed. out in the green- house under relatively i-deal conditlons, and the sample and replicate sizes were smatl. fhe liníted numbers <strong>of</strong> lines representing each heÍght class represent yet a further linitation. 222
GENER¡.L DTSCUSS]ON Since desired changes in <strong>plant</strong> type can affect the attainment <strong>of</strong> other desirable goaIs, or ¡nay influence the methodol.gy which nust be ernproyed, to attain then in a breeding progran, the clarification <strong>of</strong> the interreLationships <strong>of</strong> <strong>plant</strong> type with agronomic and quality paraneters is important. The initiat investigation reported was carried out to determine whether semi-dwarfisro is a phenotypÍc change that i.nvolve,s such effects. The methodology employed in the present study was inadequate for the estimation <strong>of</strong> genotypic r¡alues for some <strong>of</strong> the traits investigated. This Ínadequacy 1ay partially in the techníques empJ.oyed during the inve stlgation; however, the effects <strong>of</strong> reducêd <strong>plant</strong> <strong>height</strong> did cornplicate matters in some instances. lhe nature <strong>of</strong> the populations involved led to an ínflated heritability estimate for <strong>plant</strong> heíght. lhe breeding be_ haviour <strong>of</strong> other characterístics closely related to hefght was somewhat affected by this, and thelr heritabilitj,es were also high. The resuLts further lndieated that ínvoLvement <strong>of</strong> <strong>reduced</strong> <strong>plant</strong> <strong>height</strong> in hybrict barley populations would not necessítate a radi.cal departure fror¿ conventíonal selec_ tion methods to attain desirable levels <strong>of</strong> any <strong>of</strong> the other 223
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University of Mani
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ACKNOWI,EDGMENTS It has been a grea
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ÎABI,E OF TONTENTS av írÞâ dô
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Þâ o-â r Days to l'{aturity ....
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vaal ËÞe rro Days to Heading . ".
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SUGGÊSTIONSFORFIIIURSRESEÀRCH ,.,
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11. Nitrogen Fertil-izer Applicatio
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TABT-,8 42, 43, I+4, r+5. 46. 48. 4
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74. 75" ?6, 77, 78,. 79, 80. 81" 82
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xvii i occurred for yield, but the
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I]TERATURE REVIEW Semi-dwarf Growth
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In the United States the barley bre
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Tabl-e 1. Broad Sense Ileritability
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Table 2. Broad Sense Heritability E
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wíth yield. fhis group discussed t
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ship in common wheat. 0n the other
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c onpared 'r . Two other important
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eported a non-significant positive
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majority of studie
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correfation between diastatic power
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extent. Frey et al-. (1951) indicat
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seni-dwarf wheats to nitrogen ferti
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number of spíkes
Page 47 and 48:
Stanberry and Lowrey (L965) reporte
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Íright be of grea
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from varyíng seeding rates in barl
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Reports on the effect of</s
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the effect of seed
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l,upton et 41. (7974) pointed out t
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Table 3. Pedigrees of</stro
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(4) 200 Kernel weight * record.ed i
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population, using individual line m
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Site Sanford 19?6 Clay Cawnan 19?6
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Orthogonal single degree of
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Experiment lV: _-.t0qlepptite lenet
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ferences between genotype s which w
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and plant
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Table 7. con¡tonêlts of</
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was significant" fhe only case in w
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(28 to 5B/"), as reported by nost o
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Table 8. Continued Range Lor{est Li
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the Highest Yielding l,ines within
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Phenot:'¡pic Corre-Lations Sinpl-e
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Table 10. (Cortínued) Châracteris
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did Syme (f972), Fonseca and patter
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significant negative correlation wi
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elãted negative association betwee
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Aglononie ChArae'qeri s! ic s Pl"an
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Table 12. N1Ërogen FertLlizer Àpp
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Teble 14. NltrogeÍ FertLlLzêr ApP
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Table 15. NíËrogen ¡'ertil,izer
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lable 16. Nltrogen Fertlllzer Appll
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freedom comparison indicated lqínn
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lab1e 19. Nftrogen trertÍlizer Áp
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Tâble 20, Nltrogei¡ FeltLltzêr A
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TabIe 22, Nltrogen Fertillzer Appli
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Table 23. Nitrogen Fertilizer Appl
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TabLe 25. Nltrogen Fefttlizef Appll
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itable 26. Nitrogen Fertfllzer Appl
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latlê 28. Nltrogen ¡'ertlllrer Ap
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Sanford â.nd Carnan, 1926, Since N
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Tabl-e 31 . Nítrogen Fertilizer Ap
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Îable33. Nítrogen Fertllizer Appl
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Table 34. Nitrogen Fertilfzer Appli
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îab1ê 36. NLtrogeî Fertl,LLzer A
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Table 38. Nitrogen Fertllizer Appli
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lab1e 39,. NLtrogen Fertllf¿er App
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Table 41. Nitïogen Iertillzer Appl
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Table 42. Nitrogen Fertllizer Appli
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'IabLe 44. Nítrogen ¡'ertilizer A
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Q UAT,TTY Cltq.RÀcTER rsrf ts Q ua
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lable 47. Nitrogen ¡'ertilLzer App
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Table 49. Nltrogen ferrlllzer AppLl
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îhe F x G i.nteraction at portage
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fable 52, Nltrogen Fertfllze¡ Appl
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'labLe 54- Seedlng Råte - Row Spac
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Table 55. Seeding Rate - Ror'7 Spac
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Table 57. Seeding Rate - Roúr Spac
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while the tall sho\^/ed virtually n
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Table 59. Seedlûg Rate - Row Spacl
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Table 60. Seedlng Rate - Row Spacin
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Table 61. Seedlng Rate - RotT Spaci
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Table 62, SeedLng Rate - Rorar Spac
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?áble 64. Seedlng Rare - Ror.r Spa
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Table 65. SeedÍng Rate - Row Spaci
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Table 67. Seedfng Rate - Row Spací
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Table 68. AN0VA for Coleoptile Leng
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'Iable 72. Means for Experíment IV
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Table 73. (Continued ) B Variables
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'IabLe 74' Ranks of</strong
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Table 76. cenotype Means for Root D
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fabTe ?6 Cid not indicate this diff
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Table 79. Ranks of
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Tabl"e 81. ANOVA for Number <strong
Page 189 and 190: the second v¡as not significant (f
Page 191 and 192: Table 85. Mean Numbers of</
Page 193 and 194: of two locations f
Page 195 and 196: have increased the precision <stron
Page 197 and 198: showed no environmental interaction
Page 199 and 200: yield testlng experiments. Furtherm
Page 201 and 202: could in part account for the poor
Page 203 and 204: signlficant, the correl_ations were
Page 205 and 206: height and the qua
Page 207 and 208: trial period. The area in which the
Page 209 and 210: any specific cross. However, they d
Page 211 and 212: as strong nor as consl-stent as is
Page 213 and 214: with several critical agronomic par
Page 215 and 216: maturity and days in post-anthesis
Page 217 and 218: significantry rerated to several ot
Page 219 and 220: icularly when nore optimum growing
Page 221 and 222: would be useful to know the rerativ
Page 223 and 224: Kernel Weight Added N had little ef
Page 225 and 226: much as the tall genotypes. Also th
Page 227 and 228: îhe effects of N
Page 229 and 230: with the overall results of
Page 231 and 232: Phenotypicaì.J_y novel gernplasm,
Page 233 and 234: drastícaIIy changed phenotype as t
Page 235 and 236: should not be recomnended for produ
Page 237 and 238: One of the problem
Page 239: The associatíon between root growt
Page 243 and 244: inheríted" observation of<
Page 245 and 246: indicated by this study suggests th
Page 247 and 248: individual lines. It is generally c
Page 249 and 250: sístent suppLy of
Page 251 and 252: possibílity of ir
Page 253 and 254: Testing et one site for one year wa
Page 255 and 256: height genotJpes t
Page 257 and 258: ïn terms of the o
Page 259 and 260: Concern has been expressed by dryla
Page 261 and 262: ), +. ( 6, 7, Attempts should be ma
Page 263 and 264: Beech' D.F" and M.J.T, Norman. 196g
Page 265 and 266: Day, A.D, and R.K. Thonpson, 1970.
Page 267 and 268: Guitard, 4,4., J.A. Neûrnan, and p
Page 269 and 270: Konishi, T. L976. The nature and ch
Page 271 and 272: Pawlisch, P.E., and H.L. shandp. Lg
Page 273 and 274: Sisler, I^I.I^I, and p.J. Olsen. 19
Page 275 and 276: trIoodward, R.trI. 7956. The effect
Page 277 and 278: Appetrdr*' cenotvprc ìlêans fot j
Page 279 and 280: ^ppendlx conrlnue¿- Genotype Plán
Page 281 and 282: .9anul¡uor xlpuâd¡¡V ezro tzz ,
Page 283 and 284: ^pIe¡¡¿tx conrtnued. Solu It lß
Page 285: ¿\tÎen¿lr conÈtnu€d, .,¡ÃE
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