Effects of Ecological Conditions and Cultivation Methods on Rice Starch RVA Profile Characteristics and Protein Content

Abstract

In order to clarify the relations of ecological conditions, cultivation methods and their interactions with rice starch and protein qualities, the authors systematically studied the effects of cultivation methods on rice strach RVA profile and protein con-tent under different ecological conditions by using rice varieties II You 498 as material. The result showed that all of the ecologi-cal conditions, cultivation methods and interactions of them had a significant effect on the RVA profile of rice starch. With the raising of altitude and the reducing of average temperature and sunshine hours in 30 days after heading, the peak viscosity, hot paste viscosity and cool paste viscosity of RVA depressed significantly. It was found that both of seedling age and transplanting methods caused RVA profile changes. The peak viscosity and cool paste viscosity of long seedling age were higher than those of short seedling age. Meanwhile, the peak viscosity, hot paste viscosity and cool paste viscosity of the optimized-broadcasting rice treatment were lower than those of the double seedlings hand-transplanted treatment. Because of the interaction of ecological condition and cultivation method, all of the seven eigenvalue were strongly influenced, but pasting temperature. In addition, it was easy to discover that breakdown viscosity and setback viscosity were affected higher than peak time and pasting temperature, according to the coefficient of variation. Besides, all of the latitude, light and temperature conditions affected protein content se-riously. In conclusion, in order to get a better cooking and eating quality and rice yield under different ecological conditions, an appropriate cultivation method must be chosen.