结实期动态高温和干旱对软米粳稻产量和品质的影响

以软米粳稻扬农香28为试验材料,设置结实期动态高温（HT）、干旱（D）和动态高温干旱（HTD）3个处理,并以常温湿润作为对照（CK）,研究结实期动态高温和干旱对软米粳稻产量和稻米品质的影响。结果表明,与CK相比,HT处理的千粒重、结实率和产量显著增加,D处理的千粒重、结实率和产量下降,HTD处理的结实率和产量差异不显著。与CK相比,3种处理均降低了扬农香28的精米率、整精米率、直链淀粉含量和崩解值,提高了垩白粒率、垩白度、蛋白质含量、糊化温度和消减值,其中,精米率、整精米率、垩白粒率和垩白度的差异达显著水平。结实期高温和干旱均影响稻米品质,高温干旱复合处理较单一处理影响更大。

Effects of Dynamic High Temperature and Drought on Yield and Quality of Soft Japonica Rice During Filling Stage

The effects of dynamic temperature and drought on yield and quality of soft japonica rice Yangnongxiang 28 were studied with three treatments of dynamic high temperature(HT), drought(D), high temperature and drought(HTD) during filling stage, and the normal temperature moisture as CK. The results showed that, compared with CK, the 1 000-grain weight, seed setting rate and yield of HT treatment increased significantly, while that of D treatment decreased, and the difference between HTD treatment and CK was not significant. Compared with CK, the three treatments all decreased the milled rice rate, whole milled rice rate, amylose content and breakdown value, and increased the chalkiness rice rate, chalkiness degree, protein content, and disintegration value of Yangnongxiang 28. Among them, the difference of milled rice rate, whole milled rice rate, chalkiness rice rate and chalkiness degree reached a significant level. High temperature and drought at grain filling stage affected rice quality, and the effect of high temperature and drought combined treatment was greater than that of single treatment.