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以籼稻扬稻 4号和粳 /籼亚种间杂交稻组合测 0 3/扬稻 4号为材料 ,研究结实期不同土壤水分状况下稻茎 (含鞘 )中碳同化物的运转与淀粉水解酶活性的变化。结果表明 :土壤水分胁迫处理可加速稻茎中淀粉的减少 ,促进稻茎14 C向籽粒的运转 ,增加可溶性糖和蔗糖在稻茎中的累积。水分胁迫下稻茎中α 淀粉酶和β 淀粉酶活性均增加 ,但前者大于后者。α 糖苷酶和淀粉磷酸化酶活性在水分胁迫和非胁迫处理间无显著差异。在稻茎中淀粉迅速减少时期 (花后 9～2 8d) ,淀粉和14 C向籽粒的运转与α ,β 淀粉酶活性呈极显著正相关 ,尤其与α 淀粉活性的相关值更大 ,而与其他 2种酶活性的相关不显著 ,表明在水分胁迫下茎鞘中α 淀粉酶活性的增加对促进淀粉的水解和碳向籽粒的运转起着重要作用。
Using the indica rice Yangdao 4 and japonica / indica intercross hybrid rice combination 0 3 / Yangdao 4 as materials, the effects of carbon assimilation and starch hydrolysis in rice stems (including sheath) under different soil moisture conditions during the consolidation period were studied. Changes in enzyme activity. The results showed that soil water stress could accelerate the reduction of starch in rice stems, promote the 14 C of rice stems to run on grains, and increase the accumulation of soluble sugar and sucrose in rice stems. Under water stress, the activity of α-amylase and β-amylase in rice stem increased, but the former was greater than the latter. There was no significant difference between α-glucosidase and starch phosphorylase activity in water stress and non-stress treatment. During the rapid reduction of starch in the stem (9 ~ 28 days after flowering), the activities of starch and 14 C to the grain were significantly and positively correlated with α, β amylase activity, especially with α starch, There was no significant correlation with the other two enzyme activities, indicating that the increase of α-amylase activity in stem and sheath under water stress played an important role in promoting the hydrolysis of starch and the movement of carbon to grain.