育苗移栽对麦套棉^14CO2同化量及运转分配的影响

育苗移栽不仅使陆地棉(Gossypium hirsutum L.)株在苗期、蕾期、花铃期的(14)~CO_2同化强度和同化量显著提高,而且对上述各生育期同化产物向籽棉的再动员具有明显的促进作用。各期标记后3d的测定结果显示,育苗移栽增加了棉苗同化物质向根系中的分配而减少了向顶芽的分配,有利于促根壮苗;使蕾期同化物质向顶芽和边心的分配比例下降,有利于控制棉花的营养生长,防止或减轻茎叶狂长,使棉株健壮稳长,促进花芽分化;在花铃期,促使更高比例的同化物质向成铃中分配,有利于蕾铃发育。

EFFECT OF SEEDLING TRANSPLANTATION ON THE ~(14)CO_2ASSIMILATION AND THE APPORTIONMENT OF ~(14)CASSIMILATIONS WITHIN THE COTTON PLANTINTERPLANTED IN STANDING WHEAT

Using C tracer technique, the effect of cotton (Gossypium hirsutum L.) seedling transplantation on the C assimilates and 14CO2 assimilate distribution as well as redistribution were studied . It was shown that transplantation of seedlings increased both 14C assimilates and their retranslo-cation in cotton seedling markedly. The distribution of 14C assimilates in the plant organs 3 days after labelling indicated that transplantation could increase the translocation of 14C assimilates into the roots and main stem, but decrease it into the tip of cotton seedling, which benefited in establishing good quality of the seedling. Furthermore, the apportionment of 14C assimilates into growing points decreased, in favor of avoiding or reducing spindling of stead growth and improving the develope-ment of floral buds. From bloom to boll great increase of the apportionment of 14C assimilates into bolls of the transplanted plant could promote the growth and the development of squares and bolls.