摘要
水稻幼苗根吸收的７５Ｓｅ在顶叶分布较多，以下各对依次减少，但根内积累更多。当Ｙｏｓｈｉｄａ营养液加入０．１和０．３ｕｇ／ｍｌ亚硒酸钠，根吸收３２Ｐ多，幼苗长高并生根；但经０．６ｕｇ／ｍｌ处理后幼苗生长受抑制，叶片失绿。加Ｓｉ可抑制Ｓｅ高浓度使叶片变黄。在同样加Ｓｅ处理中，加Ｓｉ的株高、根长、叶绿素含量和叶片可溶性蛋白含量以及对３２Ｐ吸收量和幼苗地上部分布量均高于不加Ｓｉ的处理，并随着Ｓｅ浓度的增加而增高，而当Ｓｅ浓度过高时则下降。加Ｓｉ促进１４Ｃ－同化物分布在稻穗。
The 75Se absorbed by roots of riceplant (W6154s×Sheng-You-2, F1 )was distributed more in top leaf than inlower leaves (Fig. 1 ) and was highlyconcentrated in roots (Fig. 2 ). Plantheight, root length(Fig. 3), 32P distribution in plant shoot (Fig. 4 ) werehigher under selenium treatment(Na2SeO3) at 0.3μg/ml than at 0.1μg/ml. Na2SeO3 at 0. 6μg/ml decreasedplant growth, lowered the contents ofsoluble protein and chlorophyll in leaves(Fig. 5), making them chlorotic. Theaddition of sodium silicate (SiO280μg/ml ) together with selenite increasedplant height, contents of chlorophylland soluble protein, and the amount of32P absorbed and distributed to shoots,and made leaves greenish (Figs. 3-5 ).When selenite concentration was toohigh, they were decreased. The addition of St promoted 14C-assimilate exportfrom leaf, distribution in panicle andIAP(Wang 1987) (Fig. 6) at booting,milky and dough stages of rice plant.
关键词
水稻
硒
硅
吸收
rice, selenium, silicate, Se and Si mixed application
