水稻生育中后期使用外源植酸对产量和米质的影响

Effect of Exogenous Phytic Acid Application on Rice Grain Yield and Quality During Mid and Late Growth Stage

以杂交稻组合中浙优1号为材料，设4个时期、6种浓度的植酸溶液叶面喷施，研究了外源植酸对水稻产量及品质性状的影响。结果表明，喷施不同浓度外源植酸比对照增加籽粒产量4．1％～9．8％，经济系数提高，株高增加，穗长缩短，成熟期干物质量有所下降，整精米率、糙米率和垩白增加，精米率、碱消值和胶稠度有所降低，直链淀粉和蛋白质含量有升有降。植酸叶面喷施的浓度效应并不明显，不同生育期喷施所产生的反应存在差异。齐穗期喷施显著增加结实率和实粒数，灌浆期喷施显著提高千粒重；各时期喷施均提高经济系数；始穗期喷施增加株高，孕穗期和始穗期喷施缩短穗长；孕穗期喷施明显提高整精米率、碱消值、直链淀粉和蛋白质的含量，但同时也增加垩白。齐穗期和灌浆期喷施较低浓度（0．25％～0．5％）的植酸有利于增加产量和改善品质。

The effect of exogenous phytic acid application on rice grain yield and quality was investigated by toliar spraying at six concentrations during mid and Iate growth stages with the hybrid rice Zhongzheyou 1 as material. The results showed that rice grain yield per plant increased by 4.1 %- 9.8 %under foliar spraying of phytic acid at various concentrations, economic coefficient and plant height increased, but panicle length shortened, dry matter weights of main organs per plant at mature period dropped, moreover, quality traits such as brown and head milled rice rate, grain chalkiness increased, but milled rice yield, rice starch alkali digestion value and gel consistency descended, the contents of amylose and protein varied discrepantly. However, the effect of exogenous phytic acid spraying was not concentrationreiated but application stage-related on seed setting rate, 1000-grain weight, dry matter weight, economic coefficient, head milled and brown rice rates, grain chaikiness, rice starch alkali digestion value, protein content etc. The results indicated that foliar spraying of phytic acid at concentration of 0.25 %- 0.5 % contributed to the improvement of rice grain yield and quality at the full heading or the grain filling stages.