镉胁迫下不同水稻品种镉的累积与产量差异比较

摘要

探讨在镉(Cd)胁迫下水稻植株内的镉含量,以及水稻不同部位镉累积情况,筛选出高耐镉性且高产的水稻品种.以不同粳稻和籼稻品种为研究对象,通过盆栽试验,在不加镉与镉胁迫2种处理下,探讨不同水稻品种收获期的Cd含量,Cd累积情况.2种处理下水稻体内镉含量大致都为根＞茎＞叶＞谷壳＞籽粒,且镉主要集中在根部;镉在不同水稻品种内的累积与分布存在差异,尤其是镉在籽粒中的累积差异较大,8个中稻品种中籽粒镉含量以品种‘春优84’的增加幅度最低,表现出较低的镉累积能力;同时也表明镉胁迫下粳稻镉累积量高于籼稻;在镉胁迫处理下籼稻产量显著减少,而粳稻产量均增加.‘春优84’籽粒镉含量增幅最低,表现出显著的耐镉性,虽其产量有所影响,但从镉安全性考虑,可作为湖南省镉污染区域推广品种选用.%The cadmium (Cd) contents in rice plants and Cd accumulation in different parts of riceunder Cd stress were studied to screen out Cd-highly tolerant and high-yield rice varieties.With different varieties of japonica and indica rice as the research objects,Cd contents and Cd accumulation of different rice varieties in harvest time were discussed by pet experiment,under two treatments of no adding Cd and Cd stress.Under both the two treatments,the Cd contents in different parts of rice all ranked as root＞stem＞leaf＞husk＞grain,and Cd was manly concentrated in rice roots.Cd accumulation and distribution differed among different rice varieties,especially among grains of different rice varieties.Among the 8 rice varieties,the increase of grain Cd content of Chunyou 84 was the smallest,indicating a weaker Cd accumulation ability.At the same time,the Cd accumulation in japonica rice was higher than that in indica rice under Cd stress.Under Cd stress,the yield of indica rice decreased significantly,while that of japonica rice increased.The lowest grain Cd content of Chunyou 84 indicated significant Cd tolerance.Although its yield was affected,it can still be recommended to be promoted in the Cd-polluted region of Hunan Province,considering the Cd security.