温度对不同水稻品种糙米镉(Cd)含量的影响

本研究以不同早晚稻品种为试验材料,重点研究温度对不同耐镉型水稻品种糙米镉含量的影响,以期为不同耐镉型水稻品种糙米Cd积累的影响机理提供一定科学依据。结果表明,对于4种不同耐镉型品种,早晚稻稳定型品种在不同温度下糙米镉含量的变化幅度均明显低于变异型品种,早稻的变异型品种(S6)在不同温度与处理时期间差异达5.29倍,分别比稳定型品种S1、S5、S4增加67.4%、12.8%、181.4%,晚稻变异型品种(K11)的差异达4.04倍,分别比稳定型品种K2、K33、K7增加50.2%、78.8%、160.6%。综合多个试验品种糙米镉含量表现可见,分蘖期及灌浆期是温度影响水稻对镉吸收的敏感时期;生育前期低温处理及生育后期高温将促进水稻籽粒对镉的积累。

Effect of Temperature on Cadmium Content of Brown Rice in Different Cultivars

Field experiments were carried out to study the influence of temperature on brown rice cadmium accumulation with different early rice and late rice varieties as materials. The results indicated that the difference range of early-season variant varieties(S6) was 5.29 times under different temperature and growth stage of the four different Cd resistant varieties, and was 67.4%, 12.8%, 181.4%higher than stable varieties(S1, S5, S4) respectively, the range of late-season variant varieties(K11)was 50.2%, 78.8%, 160.6%high-er than stable varieties(K2, K33, K7)respectively. Comprehensive performance of cadmium content of brown rice in different rice cul-tivars, the tillering stage and filling stage are sensitive periods for temperature influence on uptake of cadmium; low temperature in early growth period and high temperature in later growth period contributes to accumulation of cadmium in grain.