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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C d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。
To investigate the cadmium content of rice plants under cadmium stress and the cadmium accumulation in different parts of rice, the rice varieties with high cadmium tolerance and high yield were screened out. Taking different japonica and indica rice varieties as the research objects, the C d content and Cd accumulation of different rice cultivars at harvest were investigated by pot experiment under the condition of no cadmium and cadmium stress. The contents of cadmium in the two treatments were mostly root> stem> leaf> chaff> grain, and cadmium was mainly concentrated in the roots. There were differences in the accumulation and distribution of cadmium in different rice varieties, especially in the accumulation of cadmium The difference was significant. The grain cadmium content of the eight middle-grade rice cultivars had the lowest increment of Cd accumulation in the cultivar ’Chunyou 84’, and showed a lower cadmium accumulation ability. Cadmium accumulation in the japonica rice under cadmium stress was also higher than that in indica rice; Under the treatment, the yield of indica rice decreased significantly, while the yield of japonica rice increased. The content of cadmium in Chunyou 84 was the lowest, showing significant Cd tolerance. Although its yield was affected, cadmium content could be used as the promotion of cadmium pollution in Hunan Province.