CAJ | 학술논문

目的通过比较模拟干旱胁迫条件下全生育期抗旱性不同的云南小麦资源种子萌发期抗旱性相关性状的差异，寻找早期阶段对全生育期抗旱性强弱有指标作用的种子萌发期性状。方法采用PEG-6000高渗溶液渗透胁迫法，观察了2种5亚种70份材料的发芽势、发芽率、胚根数、最大胚根长、胚芽鞘长和胚芽长等6个种子萌发期抗旱性的相关性状，分析了观察平均值及相对值与抗旱指数、抗旱系数的相关性。结果和结论在5个亚种的全生育期抗旱性强－极强品种与极弱的对照品种云选11-12、与中等或弱－极弱的品种比较中，没有一个观察性状的平均值及其相对值有一致的显著差异，也没有一个观察性状的平均值及其相对值与所有5个亚种抗旱性强－极强品种的抗旱指数、抗旱系数有一致的显著或极显著的相关性。结果表明仅用同一个抗旱性相关性状将所有亚种抗旱性强－极强的品种都区分出来是不现实的，需要利用种子萌发期的一些相关性状（如相对胚根数、相对胚芽鞘长、相对胚芽长、相对最大胚根长和根芽长比等）并结合其与抗旱指数、抗旱系数的相关性，才能筛选出不同亚种的抗旱性强－极强的育种材料。
목적통과비교모의간한협박조건하전생육기항한성불동적운남소맥자원충자맹발기항한성상관성상적차이，심조조기계단대전생육기항한성강약유지표작용적충자맹발기성상。방법채용PEG-6000고삼용액삼투협박법，관찰료2충5아충70빈재료적발아세、발아솔、배근수、최대배근장、배아초장화배아장등6개충자맹발기항한성적상관성상，분석료관찰평균치급상대치여항한지수、항한계수적상관성。결과화결론재5개아충적전생육기항한성강－겁강품충여겁약적대조품충운선11-12、여중등혹약－겁약적품충비교중，몰유일개관찰성상적평균치급기상대치유일치적현저차이，야몰유일개관찰성상적평균치급기상대치여소유5개아충항한성강－겁강품충적항한지수、항한계수유일치적현저혹겁현저적상관성。결과표명부용동일개항한성상관성상장소유아충항한성강－겁강적품충도구분출래시불현실적，수요이용충자맹발기적일사상관성상（여상대배근수、상대배아초장、상대배아장、상대최대배근장화근아장비등）병결합기여항한지수、항한계수적상관성，재능사선출불동아충적항한성강－겁강적육충재료。
[Objective]To explore indicative characters for predicting drought resistance in the whole growing period of different wheat germplasm in Yunnan Province at seed germination stage by simulating drought stress .[Method] Six germination characters associated with drought resistance , including germi-nation energy , germination rate , number of radicels , length of maximal radicels , length of coleoptiles and length of embryos among 70 accession wheat materials of Yunnan with 5 subspecies in 2 species , were studied under water and hypertonic solution of polyethylene glycol ( PEG-6000 ) described by GB/T21127-2007 treatment conditions .Moreover, the correlations between observed average values and rela-tive values of six germination characters and indexes and coefficients of drought resistance were analyzed .[Result and conclusion] Among 5 subspecies , most of the observed average values and relative values of six germination characters did not show consistently significance in the whole growing period between vari -eties of drought resistance and highly drought resistance and the control of Yunxuan 11-12 of highly weak resistance , between varieties of drought resistance and highly drought resistance and varieties of middle resistance or between drought resistance and highly drought resistance and weak and highly weak resist -ance.Accordingly, most of the observed average values and relative values did not indicate conformable significance to their relative indexes and coefficients of drought resistance in the whole growing period . These results show that it is impossible to filter out the varieties of drought resistance and highly drought resistance in the whole growing period among all subspecies just depending on a single associated germi -nation character of drought resistance .Thus, the breeding materials of different subspecies with drought resistance and highly drought resistance should be screened out by a combination of some germination characters ( relative number of radicels , relative length of maximal radicels , relative length of coleoptiles and relative length of embryos , and ratios of length of radicels-embryos) associated with drought resist-ance and indexes and coefficients of drought resistance .