玉米根系电容双向选择研究

采用Pool 16以及按20%的录选比例, 用全姊妹交轮回选择方法对群体根系电容进行双向选择筛选出的4个世代的种子, 分别在干旱、氮胁迫和正常环境下进行了评定. 在高根系电容(壮根)选择中, 根系电容按1.29 nF*代-1增加; 而在低根系电容(弱根)选择中, 根系电容以0.99 nF*代-1降低. 两种选择在胁迫条件下籽粒产量都增加, 但在正常

The Effects of Divergent Selection for Root Capacitance in Maize

Root capacitance was divergently selected using a full sib recurrent selection scheme at 20% selection rate in Pool 16. Cycle bulks from four cycles were evaluated under drought stressed, N stressed and optimal conditions. Root capacitance increased with the high capacitance selection("strong root") at 1.29 nF cycle -1 and decreased with the low capacitance selection ("weak root") at -0.99 nF cycle -1 . Grain yield increased in both selections under stress conditions but increased in root and decreased in stalk under optimal conditions. Aboveground biomass increased in root at 0.35 t/ha cycle -1 and decreased in stalk at 0.25 t/ha -1 cycle -1 across environment. The anthesis silking interval decreased in both populations while leaf senescence decreased more in root. Thus, selection for high or low root capacitance may affect plant characteristics that are of importance under stress conditions.