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用~(14)CO_2饲喂杂交籼稻威优35功能叶,研究光合产物在体内的运转。结果表明,源叶光合产物的输出及库(幼叶或谷粒)同化物输入的百分率(v)和时间(t)之间的关系均极显著地符合回归方程v=V[t+k)/[K_m+(t+k))。在分蘖期,主茎顶部完全展开叶可输出66％～79％的~(14)C-光合产物;低钾处理使源叶输出潜能和速率下降,过量钾处理加快光合产物输出速率;未展开的幼叶可输入28％～59％的~(14)C-光合产物,低钾不仅降低输入潜力,且使输入延迟。在灌浆期,剑叶可输出83％～97％的光合产物,其中77％～88％运往谷粒;低钾处理延迟光合产物输出时间,降低输出速率;过量钾处理降低输出潜力,但提高输出速率;低钾处理还降低同化物输入谷粒的比例和速率,过量钾处理降低同化物输入谷粒的比例,但提高输入速率。所以,从总体上看,低钾和过量钾处理都不利于新固定的同化物在体内的运输。
The functional indica rice, Youyilou 35, was fed with ~ (14) CO_2 to study the photosynthetic products in vivo. The results showed that the relationship between the output of photosynthate of source leaves and the percentage of assimilate input (v) and time (t) of sink (young leaf or kernel) all accorded with regression equation v = V [t + k) / [K_m + (t + k)). At the tillering stage, the fully developed leaves on the top of the main stem could output ~14% C-photosynthate of 66% -79%; the low potassium treatment decreased the output potential and rate of the source leaves, the excessive potassium treatment accelerated the photosynthate output rate; Of young leaves can input 28% ~ 59% of ~ (14) C-photosynthetic products, low potassium not only reduces the input potential, and the input delay. During the filling stage, the flag leaves can output 83% -97% of the photosynthetic products, of which 77% -88% are transported to the grain; the low potassium treatment delays the output time of photosynthetic products and reduces the output rate; excess potassium treatment reduces the output potential but increases the output Low potassium treatment also reduced the ratio and rate of assimilates input to grains, while excess potassium treatment decreased the rate of assimilates input to grains, but increased the input rate. Therefore, in general, both low potassium and excess potassium treatment are not conducive to the transport of the newly fixed assimilates in the body.