外源海藻糖对大穗型粳稻稻米品质的影响

Effects of exogenous trehalose on the quality of large-panicle japonica rice

为明确外源海藻糖对大穗型粳稻稻米品质的影响,以大穗型粳稻品系W1844和CJ03为试验材料,在孕穗末期叶面喷施浓度分别为0、30和50 mmol/L的海藻糖溶液(分别记为T_(0)、T_(30)和T_(50)),研究外源海藻糖对大穗型粳稻不同粒位稻米加工、外观及营养品质的影响。结果表明,外源海藻糖处理可以通过提高精米率与整精米率改善强、弱势粒的加工品质;通过降低垩白粒率和垩白度改善外观品质;通过提高蛋白质含量、胶稠度,降低直链淀粉含改善营养品质;不同喷施浓度以及不同粒位的改善方式和程度间存在差异。综上,外源海藻糖可提高大穗型粳稻稻米的加工、外观及营养品质,且对弱势粒稻米品质的改善程度高于强势粒。该研究结果可为培育高品质大穗型粳稻提供依据。

In order to clarify the effect of exogenous trehalose on the quality of large-panicle japonica rice,this study took large-panicle japonica rice lines W1844 and CJ03 as experimental materials,and sprayed trehalose solution with concentrations of 0,30 and 50 mmol/L(recorded as T_(0),T_(30) and T_(50),respectively)on the leaf surface at the end of pregnancy.The effects of exogenous trehalose on processing,appearance and nutritional quality of large-panicle japonica rice with different grain positions were studied.The results showed that exogenous trehalose treatment could improve the processing quality of superior and inferior spikelets by increasing the milled rice rate and finishing rice rate.The appearance quality was improved by reducing chalkiness and chalkiness.The nutritional quality can be improved by increasing protein content and glue consistency and reducing amylose content.The improvement method and degree of different spraying concentration and different particle position were different.In conclusion,exogenous trehalose can improve the processing,appearance and nutritional quality of large-panicle japonica rice,and the improvement degree of inferior spikelets quality is higher than that of superior spikelets.The results can be used to improve the theoretical basis for cultivating high quality large-panicle japonica rice.