镉胁迫下不同水稻品种幼苗生长及光合性能的差异
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湖南省科学技术厅重点研发计划项目(2015NK3013)


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    摘要:

    设置0(对照)、0.05、0.10、0.20 mmol/L CdCl2?2.5H2O等4种镉胁迫处理,采用水培法,测定不同镉胁迫处理下28占、黄华占、丰华占、黄粤占选、矮秀占、黄粤占6个镉抗性不同的水稻品种的幼苗高、幼根长、幼苗鲜质量、幼苗干质量、叶片叶绿素含量及其叶绿素荧光参数。结果表明:不同镉胁迫处理下,6个供试水稻品种的幼苗高、幼苗根长、幼苗鲜质量及干质量随着镉胁迫浓度的增大而降低;镉胁迫高抗性水稻品种28占和黄华占与镉胁迫中等或低抗性的丰华占、黄粤占选、矮秀占、黄粤占相比较,其幼苗高、幼苗根长、幼苗鲜质量与干质量在镉胁迫下均表现出显著的优势,能保持一定速度的幼苗生长及物质累积;随着镉胁迫处理浓度的增大,6个供试水稻品种的叶绿素含量均呈下降趋势,光合作用PSⅡ的初始荧光参数(F0)均逐渐增加,潜在最大光化学效率(Fv/Fm)均逐渐降低,其光化学转换的实际量子效率(ФPSⅡ)和电子传递效率(ETR)均降低;不同镉胁迫抗性的水稻品种间的苗期生长及光合性能存在明显差异,黄粤占与矮秀占2个镉胁迫低抗性水稻品种的苗期生长性能比28占、黄华占2个镉胁迫高抗性水稻品种及丰华占、黄粤占选2个镉胁迫中等抗性水稻品种的抑制程度低,其光合性能破坏程度比28占、黄华占、丰华占、黄粤占选的高。

    Abstract:

    In order to study the effect of cadmium stress on the growth and photosynthetic performance of different rice varieties, a group of CdCl2?2.5H2O, with four coencetrations, 0(distilled water), 0.05, 0.10, 0.20 mmol/L were used to culture six rice varieties. A batch of planting parameters including seedling height, young root length, fresh and dry weight of seedlings, chlorophyll content of leaves and chlorophyll fluorescence parameters of six different rice varieties(28zhan, Huanghuazhan, Fenghuazhan, Huangyuezhanxuan, Aixiuzhan, Huangyuezhan) were collected to investigate the effect of cadmium on the rice growing. The results show that seedling height, root length, fresh weight and dry weight decreased with the increase of Cd stress concentration. Among them, 28zhan and Huanghuazhan rice varieties with high resistance to cadmium stress showed significant advantages in seedling height, root length, fresh weight and dry weight under cadmium stress compared with other four rice varieties with medium or low resistance to cadmium stress. They still maintained a certain speed of seedling growth and material accumulation, which showed that they had stronger resistance to cadmium stress at seedling stage. With the increase of Cd stress concentration, the chlorophyll content of leaves of six rice varieties showed a downward trend; the initial minimum fluorescence of PSⅡ for photosynthesis(F0) increased gradually; the potential maximum photochemical efficiency(Fv/Fm) decreased gradually; the actual quantum efficiency of photochemical conversion(ФPSⅡ)decreased, and the apparent photosynthetic electron transport efficiency(ETR) decreased. There were significant differences in seedling growth and photosynthetic performance among rice varieties with different cadmium stress resistance. The growth performance of rice varieties with low resistance to cadmium stress was lower than that of rice varieties with high resistance and medium resistance to cadmium stress, and the destruction of photosynthetic performance of cadmium stress were forceder than other varieties.

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李陈贞,孙亚莉,刘红梅,徐庆国.镉胁迫下不同水稻品种幼苗生长及光合性能的差异[J].湖南农业大学学报:自然科学版,2021,47(2):.

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  • 在线发布日期: 2021-04-28
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