墨西哥春小麦品种熟期与穗部rn经济性状的遗传通径分析

摘要

Genetic relationship of 8 character, e.g. shooting period, heading period, flowering stage, mature period and grains per spike,1000 -seed weight, grain weight per spike, yield per plot etc. were studied by mean s of path analysis. The results indicated that positive phenotype and genetic c orrelation of heading period and flowering to mature period were significant or highly significant, positive genetic correlation of heading period and flowering to grains per spike were significant, negative phenotype and genetic correlat ion of shooting period and heading peroid and flowering and mature period to 100 0-seed weight were significant or highly significant, positive phenotype and g enetic correlation of shooting period to yield per plot were significant or highly significant, relationship of path of flowering period to mature period, heading period and flowering to grains per spike and 1000-seed weight,shooting period and grain number per spike to yield per plot were real%对35份墨西哥春小麦品种的拔节期、抽穗期、开花期、成熟期和穗粒数、千粒重、穗粒重及小区产量等8个性状的遗传相关和通径关系进行分析研究，结果表明：①墨西哥小麦品种的抽穗期、开花期与成熟期呈极显著表型正相关(r＝0.5 9和0.569）和遗传正相关(r＝0.67和0.712）；②抽穗期、开花期和成熟期与穗粒数呈显著遗传正相关(r＝0.389、0.442和0.418)；③拔节期、抽穗期、开花期及成熟期与千粒重呈显著或极显著表型负相关(r＝－0.495、－0.381、－0. 463和－0.298)和遗传负相关(r＝－0.78、－0.66、－0.77和－0. 374)；④拔节期与小区产量呈显著或极显著表型正相关和遗传正相关(r＝0.396和 0.519)；⑤开花期对成熟期、拔节期和开花期对穗粒数和千粒重、拔节期和穗粒数对小区产量具有真实的通径关系