【作者】 吴成春；

【导师】 李合松；

【作者基本信息】 湖南农业大学 ， 生物物理学， 2007， 硕士

【摘要】 本文以米粉专用稻品种湘早籼33号和高产杂交早稻组合陆两优996为试材，采用核素示踪技术和常规技术相结合，系统研究了两种化学调节剂对其稻米直链淀粉含量(Amylose Content，AC)的影响及其生理基础，有关结论如下：1、喷施化学调节剂可定向调控米粉稻稻米AC，对其产量也有一定影响。齐穗期喷施调节剂A能降低米粉稻稻米AC，而喷施调节剂B提高稻米AC。调节剂对米粉稻产量的影响因品种而异，调节剂A增加湘早籼33号产量，调节剂B降低其产量，两调节剂都使陆两优996产量降低，但与对照相比，差异都不显著。2、喷施化学调节剂影响米粉稻籽粒淀粉的积累过程，最终改变其AC。齐穗期喷施调节剂A既能促进米粉稻灌浆前期籽粒淀粉积累，也能促进灌浆后期以支链淀粉为主的籽粒淀粉的积累，最终降低了稻米AC；喷施调节剂B也促进米粉稻灌浆前期籽粒淀粉的积累，但减弱其灌浆后期籽粒淀粉积累，最终提高稻米AC。3、喷施化学调节剂可改变米粉稻“源—库”特征，影响其产量。喷施调节剂A使湘早籼33号增“源”、强“库”、畅“流”，增加其产量；调节剂B降低了湘早籼33号灌浆后期“流”的畅通性，使其产量降低；两调节剂均破坏了陆两优996灌浆后期“源—库”协调性，导致其减产。4、喷施化学调节剂不仅可改变米粉稻植株地上部的生长特性，也影响其根系活力。齐穗期喷施调节剂能增强米粉稻根系活力，协调植株地上与地下部生长，增加植株对磷的吸收率，提高植株地上部各部位的磷含量。更多还原

【Abstract】 Effect of two chemical regulators on Amylose Content(AC) of rice grainand their physiological foundations were studied with isotope tracertechnique and regular technology. Xiangzaoxian 33 and Luliangyou 996 wereused as materials for experiments, the former is a conventional ricevariety of noodle rice, while the latter is a High-yielding Early HybridRice Combination. The conclusions are as follows:1. AC of noodle rice grain could be directionally changed by sprayingthe chemical regulator on rice plant, which also changed noodle rice yield.AC of noodle rice grain could be decreased by spraying regulator A onnoodle rice plant at full heading stage, while AC could be increased byspraying regulator B. The effects of regulators on yield of noodle ricevary with cultivars and regulators: Regulator A could increase yield ofXiangzaoxian 33, while regulator B decreased it. Both of the regulatorsdecreased yield of Luliangyou 996. But none of these had significantdifference with CK.2. Grain starch accumulation of noodle rice could be changed byspraying regulators, which finally lead to change of AC. Starchaccumulation of early filling stage could be accelerated by sprayingregulator A at full heading stage, which also accelerated starchaccumulation of later filling stage, when it mainly synthesis Amylopectin.Finally, Grain AC of noodle rice was decreased. Starch accumulation ofearly filling stage also could be accelerated by spraying regulator B,which decreased starch accumulation of later filling stage, increasedgrain AC of noodle rice finally. 3. The "source-sink" relationship of noodle rice was changed byspraying regulators, which finally affected noodle rice yield. "source"、"sink" and "flow" of Xiangzaoxian 33 were increased、promoted and unimpeded by regulator A respectively, which increased itsyield, while yield of Xiangzaoxian 33 was decreased by regulator B, whichdecreased its free "flow" at later filling stage. The yield of LU LIANGYOU 996 were decreased by both of the regulators due to its harmony of"source-sink" was damaged.4. The root activity of noodle rice was also affected by regulatorsas shoot was. The root activity and uptake percent of phosphorous wereincreased by Spraying regulators on noodle rice plant at full headingstage, which could also harmonized noodle rice growth of root and shoot,increased phosphorous content of all shoot parts.更多还原