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Zhang Xiusheng;Shen Zhenguo and Shen Kang(Deparlment of Agronomy, Nanjing Agricultural Univcrsity, Nanjing, 210095)  
ot experiments were conducted to study the effects of boron on floral organsdevelopment and seed-setting of rapeseed (Brassica napus L.).The results are asfollows:In boron-free(B_0)and boron-normal (B_1) plants, boron concentrations offloral organs were greater than those of leaves, especially with boron in pistil andstamen twice as high as that in leaves. But leaves had the greatest boron concentra-tion when boron was excess (B_2). Boron deficiency led in reduction of the lengthand weight of stamen and in abnorniality of anther tapetum development.Diffe-rentiation of pollen sac was inhibited. It was found that both boron deficiencyand excess reduced the numbers of effective siliques per plant and seeds per silique,rate of siliques,rate of seed-setting, and rape seed yield. The effect of boron onthe number of ovules per silique was not significant. Compared with Ningyou No.7 (a high erucic acid type),Ningyou No. 8 (a low erucic acid type) was moresensitive to boron-deficiency and boron-excess.
【CateGory Index】: S565.401
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