不同种植密度对江汉平原三个主推小麦品种产量的影响

以江汉平原主推小麦(Triticum aestivum L.)品种漯麦6010、郑麦9023、鄂麦580为试验材料,设置了每公顷225万、300万、375万3个密度处理,分析了密度对不同品种小麦产量、直链淀粉与支链淀粉含量比值、孕穗及开花期旗叶叶绿素和丙二醛(MDA)含量的影响。结果表明,同一品种不同密度处理间,3个品种在密度为300万/hm~2时,子粒产量和旗叶叶绿素SPAD值均达最高,旗叶MDA含量最低;郑麦9023和鄂麦580在密度为375万/hm~2时直链淀粉与支链淀粉含量比值最高,密度为225万/hm~2时最低,而漯麦6010则在密度为225万/hm~2时比值最高,300万/hm~2时比值最低。同一密度不同品种间,漯麦6010子粒产量和旗叶叶绿素SPAD值最高,鄂麦580最低,郑麦9023居中;而旗叶MDA含量以漯麦6010最低,鄂麦580的最高,郑麦9023居中;鄂麦580的直链淀粉与支链淀粉含量比值最高,其次是漯麦6010,郑麦9023最低。

Effects of Planting Density on Grain Yield of Three Main Wheat Cultivars in Jianghan Plain

Taking three main wheat(Triticum aestivum L.) cultivars of Zhengmai 9023, Luomai 6010 and Emai 580 in Jiang-han plain as materials,and three density treatments of 2.25,3.00,3.75 million/hm2 were set up to study the effects of density on yield, the ratio of amylose and amylopectin content, flag leaf chlorophyll and MDA at booting and anthesis stage. The re-sults showed that, among the three density treatments of the same cultivar, when the density was 3.00 million/hm2, the grain yield and SPAD value of three cultivars were the highest, MDA content of them were the lowest. The ratio of amylose and amylopectin content of Zhengmai 9023 and Emai 580 were the highest when the density was 3.75 million/hm2,and were the lowest when the density was 2.25 million/hm2;Luomai 6010 was different, the ratio of amylose and amylopectin content of the treatment was the highest when the density was 2.25 million/hm2, and was the lowest when the density was 3.75 million/hm2. Among cultivars for the same density,the grain yield and SPAD values of fiag leaves of the cultivars from high to low were Luomai 6010, Zhengmai 9023 and Emai 580; the MDA content of fiag leaves of the cultivars from high to low were Emai 580, Zhengmai 9023 and Luomai 6010. The ratio of amylose and amylopectin content of Emai 580 was the highest,and it of Zhengmai 9023 was the lowest.