中国生态农业学报2011，Vol.19Issue(2)：305-311,7.DOI:10.3724/SP.J.1011.2011.00305
结实期土壤水势对水稻籽粒品质及其粒间差异的影响
Effect of soil water potential on grain quality at different spike positions during grain filling in rice
摘要
Abstract
This study investigated the effects of soil moisture stress during grain filling on the quality of grains at different rice spike positions.Two rice cultivars, “Yangdao 6” (indica) and “Yangjing 9538” (japonica), were pot-grown and subjected to four soil moisture treatments (0 kPa, -15 kPa, -30 kPa, -45 kPa) during post-anthesis grain filling stage.The study showed that soil moisture condition during the grain filling greatly influenced grain quality.The sensitivity of grain quality to soil moisture varied with cultivar and grain position within the panicle.Compared with 0 kPa (CK) soil water potential, milled rice rate, head milled rice rate and breakdown value at an increased rate under moderate dry soil treatment (i.e., soil water potential of-15～ -30 kPa).However, the degree of chalkiness and setback value decreased.Grains from secondary branches were more obviously affected than those from primary branches.Furthermore, moisture stress had greater effect on grains that flowered late than those that flowered early in the same branch.Rice quality also worsened with decreasing soil water potential.As soil water potential dropped from 0 kPa to -45 kPa, crude protein content and gel consistency increased.The results suggested that moderate dry soils with water potential of-15 ～ -30 kPa at grain filling enhanced grain formation and rice quality.关键词
结实期/土壤水势/粒位/稻米品质Key words
Grain filling stage/ Soil water potential/ Grain position within a panicle/ Rice quality分类
农业科技引用本文复制引用
董明辉,谢裕林,刘晓斌,吴翔宙,赵步洪,杨建昌..结实期土壤水势对水稻籽粒品质及其粒间差异的影响[J].中国生态农业学报,2011,19(2):305-311,7.基金项目
国家自然科学基金项目(30400276,30871480)、江苏省自然科学基金项目(BK2009005)和扬州大学人才启动基金项目资助 （30400276,30871480）
