K型杂交小麦灌浆特性的杂种优势及相关分析

Studies on the Heterosis and Correlation of Grain Filling Characteristics in Hybrid Wheat with Ae kotschyiCytoplasm

１９９４～１９９６年用５个Ｋ型小麦不育系与７个恢复系进行不完全双列杂交，研究杂交小麦灌浆特性的杂种优势及最终粒重与各灌浆参数间的关系。结果表明，第１灌浆阶段，杂交种普遍表现出持续期的正优势，灌浆速率的负优势，干物质积累量不同组合则优势表现不同；第２阶段，持续期大都表现为负优势，速率和干物质积累量杂种间差异较大；优势变异最广泛的是第３阶段，无论是持续期、速率，还是干物质积累量都如此。杂交种最终粒重受各种灌浆速率的影响较大，而受持续期的影响较小，以第２阶段干物质积累量ｇ２的直接贡献最大。

The heterosis of parameters about grain filling characteristics and correlation between them were studied in 35 wheat hybrids crossed with 5 A-lines with Ae kotschyi cytoplasm and 7 R-lines  The results showed that generally the grain filling period t1 was passitive heterosis , the grain filling rate FR1 Was negativ heterosis and the heterosis of grain weight g1 varied with hybrids in 1st stage of grain filling  In the 2nd stage , the heterosis of t2 in most hybrids was negative, g2 and FR2 varied greatly  in the 3rd stage , the heterosis , not only g3 , FR3 but also t3 , varied very greatly  GW was influenced mainly by all kinds of grain filling rate  In all parameters , g2 had the greatest direct contribution to GW