黄土高原沟壑区小麦品种演替过程中籽粒灌浆特性研究

为了解黄土高原沟壑区小麦品种演替过程中的籽粒灌浆特性,以此地区20世纪50年代至今的主栽小麦品种为供试材料,研究了不同小麦品种演替过程中籽粒干物质积累量及灌浆速率的变化。结果表明,黄土高原沟壑区小麦演替过程中,小麦籽粒千粒重呈现逐渐增加的趋势。平均灌浆速率逐渐增加,小麦籽粒的干物质积累随之增加,长旱58的W0最大,达50.53 g。灌浆三阶段中,各阶段的灌浆速率表现为,V2>V1>V3。从灌浆持续时间看,T1和T2持续的时间较长且变异系数较大,而T3和T相对稳定。从灌浆速率来看,V1、V2、V3、Vm、Va变异系数较大,灌浆速率易受环境因素影响而波动。

Study on the Grain-filling Characteristic of the Succession of Wheat Cultivars in the Gully Areas of the Loess Plateau

In order to study the grain-filling characteristic of the succession of wheat cultivars in the Gully areas of the Loess Plateau,We chose major wheat varieties in this area since the 1950s as the material.We studied the dry matter accumulation and filling rate,the results indicated that,with the succession of wheat cultivars,1000-grain weight showed an increasing trend,the process of the increase of grain's weight presents a shape of "S".With the average filling rate increasing gradually,the wheat grain dry matter accumulation increases,the W0 of Changhan 58 is the largest with 50.53 g,during the three stage of the grain-filling,the filling rate is V2>V1>V3.Through the period of grain filing,T1 and T2 are longer with larger CV,T3 and T are relatively stable.Through the filling rate,the CV of V1,V2,V3,Vm and Va are larger,filling rate is influenced by environmental factors.