作物学报 ›› 2013, Vol. 39 ›› Issue (10): 1843-1848.doi: 10.3724/SP.J.1006.2013.01843
王晔,田晓莉*
WANG Ye,TIAN Xiao-Li*
摘要:
以中棉所41和辽棉17为材料,采用单接穗双砧木嫁接的方法构建分根体系,在营养液培养条件下研究棉花幼苗钾吸收的系统反馈调节。分根处理6 d后,高钾侧(2.50 mmol L–1)根系(Sp.+K)的吸收能力受到低钾侧(0.01 mmol L–1)K+需求信号的诱导,吸收动力学参数Imax (最大吸收速率)与整根高钾对照(C.+K)相比增加了79%~92%;低钾侧根系(Sp.-K)的Imax则受到高钾侧K+供应信号的抑制,与整根低钾对照(C.-K)相比下降了27%~40%。中棉所41分根处理3 d后去除低钾侧根系,保留的高钾侧根系失去K+需求信号的诱导,其Imax下降。棉花幼苗K+吸收的这种反馈调节与地上部和根系的K+含量关系不大。
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