Chemical Regulation Of Noodle Rice Grain Amylose Content And Its Physiological Foundations

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.