【摘要】 通过砂培试验,研究了水稻根系和地上部分(苗)对局部根系供应氮素的适应性变化。局部根系供应氮素对水稻根系形态,生物量及碳、氮分配有明显的影响。无论供氮量高低,供氮一侧均能诱导根系生长发育,表现为供氮一侧侧根长、根表面积、根系体积、根重等明显高于无氮侧,但是根系直径明显变细。供氮侧根系碳水化合物含量高于无氮侧;随供氮量的增加,碳水化合物含量相对减少。根据试验结果,认为局部供应氮素诱导根系生长发育的可能机理是无氮一侧根系的饥饿信号诱导地上部碳水化合物定向运输和分配到供氮侧的根系,从而促进该侧根系的生长发育。更多还原

【Abstract】 Sandy culture was conducted to investigate the effect of localized nitrogen supply on rice root, such as root tips, root length, root surface area and allocation of carbon and nitrogen in rice for studying the adaptation of rice to nitrogen supply. Localized nitrogen supply had a significant effect on rice root morphology, plant biomass as well as partition of carbon and nitrogen in plant. Lateral root length, root surface area, root volume and root biomass were induced in section supplied nitrogen fertilizer, whereas root diameter decreased by localized supply of nitrogen no matter how much nitrogen used. The content of carbohydrate in nitrogen supplied section is higher than that in nitrogen deprived section. With the increase of nitrogen supply, the content of carbohydrate decreased. The possible mechanism which supplying nitrate to partial roots could induce the growth of rice root on the nitrogen supplied section is that nitrogen may induce transport and allocation of carbohydrate from shoots to roots on the section supplied nitrate nitrogen.更多还原