大豆叶片衰老QTL的初步定位

 【目的】叶片衰老是植物的一个发育性状，对植物体内营养再分配与光合作用有重要影响。【方法】利用2套重组自交系群体进行大豆叶片衰老QTL的初步定位，并进行与产量性状的相关分析。【结果】在C1、D1b+W和O连锁群上检测到3个与大豆叶片衰老有关的QTL，可解释表型变异的5.8%～13.7%。除NJ(SP)BN群体熟期与叶片衰老相关程度较低外，两个RIL群体中生物学产量、籽粒产量、株高和熟期与叶片衰老间均存在显著或极显著的正相关；而收获指数与叶片衰老间一个群体为极显著负相关，另一个群体则表现为极显著正相关。【结论】在大豆育种中，针对延迟叶片衰老选育出的材料有时仅能提高收获指数，这样的材料往往产量潜力不高。

Mapping of QTLs Associated with Leaf Senescence in Soybean

【Objective】Leaf senescence is a character of plant development, Delayed leaf senescence or stay green character has received considerable attention because of its negative impact on photosynthesis and its role in nutrient redistribution within the plant. 【Method】RIL-1 and 2 populations were used identified QTLs associated with leaf senescence, and correlation between leaf senescence and yield traits were also conducted. 【Result】The primary results indicated that three QTLs for leaf senescence were detected and mapped on LG-C1, D1b+W and O, each QTL explained 5.8~13.7% of total variation. Leaf senescence significantly and positively correlated with biological yield, seed yield, plant height and days to maturity in both populations except lower correlation with days to maturity in RIL-2. However, different correlation between leaf senescence and harvest index were observed, negatively and significantly in RIL-1 and positively and significantly in RIL-2. 【Conclusion】These indicated that harvest index may be increased through the selection of delayed leaf senescence in soybean breeding, but breeding materials with high potential of yield couldn’t be obtained.