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为了探讨CO2浓度升高下不同水稻品种荣优398(RY)和粤杂889(YZ)吸收重金属Cd差异性的原因,利用水培试验研究了不同浓度Cd处理下两种水稻吸收Cd的差异及根形态的变化特征.结果表明:低Cd处理(5、10、20μmol·L-1)显著增加水稻生物量;当Cd浓度高于50μmol·L-1时,Cd胁迫效果开始显现,水稻生物量减少.CO2浓度升高显著增加了水稻的生物量,增加了YZ茎Cd含量而降低了RY茎Cd含量.在5～200μmol·L-1的Cd浓度下,CO2浓度升高增加了YZ活性根在总根长中的比例,降低了RY活性根的比例.CO2浓度升高下不同水稻品种根形态的变化是导致其对Cd吸收差异性的原因之一.
In order to investigate the difference of Cd uptake by different rice cultivars Rongyou 398 (RY) and Yueza 889 (YZ) under elevated CO2, the differences of Cd uptake by two rice cultivars with different Cd concentrations The results showed that low Cd treatment (5, 10 and 20μmol·L-1) significantly increased rice biomass. When the Cd concentration was higher than 50μmol·L-1, Cd stress began to appear, and the biomass of rice Reducing the increase of CO2 concentration significantly increased the biomass of rice, increased the content of Cd in YZ stem and decreased the content of Cd in RY stem.Under Cd concentration of 5 ~ 200μmol·L-1, the increase of CO2 concentration increased the activity of YZ The ratio of total root length decreased the proportion of RY active root.Changes in root morphology of different rice varieties under the increase of CO2 concentration were one of the reasons leading to their differences in Cd uptake.