【摘要】 选取不早衰、轻度早衰及严重早衰三种类型的冬小麦品种,测定其主茎旗叶的叶氮量(单位叶面积含氮量,N/LA)、硝酸还原酶活性(NRA)、氮收获指数(籽粒 N/地上部 N,NHI)、千粒重日增长量及根系活力(RA)。结果表明:随品种早衰程度的不同各生理参数具相似的变化规律,总是不早衰类型的高于严重早衰类型的,轻度早衰的居中。更多还原

【Abstract】 Three types of winter wheat(Triticum aestivum)varieties on premat-ure senescence were measured for the nitrogen content per unit leaf area(N/LA),the nitrate reductase activity(NRA)of main shoot flag leaves,the nitrogen harvest index(the nitrogen content of grain/total nitrogencontent of whole shoot,NH(?)),the daily increment of thousand grain we-ight and the activity of root(RA).The similar trends were observed in the relationship between the de-gree of premature senescence and the physiological parameters.Therealways were higher values in the type of unpremature senescence varietiesthan that in the type of premature senescence ones.更多还原