【摘要】 利用弯穗型品种丰锦和直穗型品种辽粳5杂交高世代(F14)中分离的一对直立穗型和弯穗型近等基因系(ZF14和WF14)研究了粳稻直立穗型基因对农艺性状的影响。结果发现,直立穗基因(EP)除了使穗型直立外,还具有使植株矮化、穗长变短、叶型直立、叶片变短变宽等作用。它能使一次枝梗上的二次枝梗数增加,从而增加二次枝梗颖花数和着粒密度,达到增加产量的目的。直立穗基因(EP)可能从幼苗开始生长阶段(播种后10 d)就有表达效应,使得幼苗在株高、叶形态和干物质重上表现出差异。内源激素含量上的差异是使近等基因系在形态性状上表现出差异的内在生理原因。更多还原

【Abstract】 Effect of erect panicle japonica gene on agronomic traits were studied using a pair of erect panicle type near-isogenic lines(ZF14 and WF14) derived from high-generation(F14) of curved panicle variety Toyonihiki and erect panicle variety "Liaojing 5" cross.The results showed that the erect panicle gene(EP) have the effect of not only making panicle type erect,but also making plant height dwarf,panicle length short,leaf posture erect,leaves wide and short and so on.EP increased the number of secondary branch on primary branch,consequently EP raised yield through increasing fertilized spikelet number on secondary branch and grain density.EP may have expression effect from the seedling growth stage(10 d after sowing).It make seedlings present differences in plant height,leaf shape and dry weight.The inherent physiological causes that NILs made difference in morphological traits were that endogenous hormone contents differenced in each growth stage.更多还原