密度对稻田套播强筋小麦花后剑叶衰老特性的影响

稻田套播小麦作为轻简栽培的一种播种方式在稻麦两熟生产中广泛应用.本试验在江苏淮北地区设计不同密度试验,研究其对稻田套播强筋小麦花后剑叶叶绿素含量、SOD酶活性和MDA含量的影响,结果表明:随花后生育进程推移,叶绿素含量呈下降趋势,且随密度增加,下降幅度增大;花后单茎干物质积累量和单茎籽粒产量亦随密度增加而下降,二者呈极显著负相关;随花后生育进程推移,剑叶SOD酶活性呈单峰曲线变化,可用二次曲线方程模拟,在花后14～16 d达峰值,且随密度增加峰值出现时间提前,峰值数值呈先上升再下降的变化特征;随花后生育进程推移,剑叶MDA含量呈上升的变化特征,且随密度增大,数值变大;花后35 d剑叶SOD酶活性与花后单茎干物质积累量和单茎籽粒产量呈极显著正相关,而MDA含量与花后单茎干物质积累量和单茎籽粒产量则呈显著或极显著负相关.

Effects of Density on Senescene Characteristics of Strong-gluten Wheat Interplanted in Paddyfield

Wheat interplanted in paddyfield,which was a light and predigesting cultivation method,was applied widly in area with planting rice and wheat production.The effects of different plant densities on flag leaves chlorophyll content,SOD activity and MDA content after anthesis in strong-gluten wheat interplanted in paddyfield were studied.Chlorophyll content in flag leaves kept declining after anthesis,and the declining rate increased when the density increased.The dry matter accumulation amount after anthesis per stem(DAAA)and grain yield per stem(GYPS)increased with the increase of plant density.DAAA and GYPS were very significantly negatively correlated with plant density.The trend of SOD activity in flag leaves after anthesis showed a single peak curve,the maximum value appeared in the period from the 14th to the 16th day after anthesis.MDA content in flag leaves declined after anthesis,which increased when the density increased.On the 35th day after anthesis,SOD activity in flag leaves had a very significantly positively correlation with DAAA and GYPS,but MDA content in flag leaves had a significantly or very significantly negatively correlation with DAAA and GYPS.