| 李仁英,沈孝辉,张耀鸿,周志高,谢晓金,李映雪,徐向华,覃郑婕.无机砷对不同水稻品种种子萌发和幼苗光合生理的影响[J].农业环境科学学报,2014,33(6):1067-1074. |
| 无机砷对不同水稻品种种子萌发和幼苗光合生理的影响 |
| Effects of Inorganic Arsenic on Seed Germination and Photosynthetic Characteristics of Various Rice Cultivars |
| |
| DOI：10.11654/jaes.2014.06.002 |
| 中文关键词: 砷 水稻 发芽率 光合生理 |
| 英文关键词: arsenic rice germination rate photosynthetic characteristics |
| 基金项目: |
|
| 摘要点击次数: 2160 |
| 全文下载次数: 2296 |
| 中文摘要: |
| 通过砷胁迫下水稻种子发芽和水培试验，测定了不同水稻品种发芽率、根长及芽长等萌发指标及光合生理指标，分析了不同水稻品种耐砷性差异。结果表明，砷浓度<0.6 mg·L-1时，促进了大部分水稻品种的发芽率及芽和根的生长，当砷浓度达到0.8 mg·L-1以上时则显著抑制了发芽率及芽和根的生长（P<0.05），但出现抑制作用的起始砷浓度因水稻品种不同而具有差异。武运粳24、镇稻16和两优6326发芽率抑制作用的砷起始浓度明显高于其他水稻品种。砷浓度逐渐升高时，宁粳1、南粳44、镇稻16、武运粳24和两优6326的根和芽的生长明显优于其他水稻品种，但当砷浓度达到最大值（3.0 mg·L-1）时，根和芽的生长受到显著抑制，且根所受的抑制作用明显大于芽。除宁粳1和南粳44外，短时间砷胁迫没有显著降低其他水稻品种叶片的相对叶绿素含量（SPAD）。短时间砷胁迫使得大部分水稻品种的净光合速率增加，但胞间CO2浓度、气孔导度和蒸腾速率则显著下降。不同品种水稻对砷的耐性具有显著差异，这为耐砷水稻品种的筛选提供了重要的科学依据。 |
| 英文摘要: |
| It is important to screen out rice cultivars that are higher tolerance and lower accumulation for arsenic（As）. We investigated the effects of inorganic As on seed germination and photosynthetic characteristics of nine rice cultivars collected across Jiangsu province using seed germination and seedling hydroponic experiments. Germination rates of rice seeds and growth of rice spout and root were stimulated under As concentrations less than 0.6 mg·L-1, but inhibited at As greater than 0.8 mg·L-1. However, the initial As concentrations that inhibited rice germination varied with rice cultivars. They were 2.0 mg·L-1, 3.0 mg·L-1 and >3.0 mg·L-1 As for Wuyunjing 24, Zhendao 16 and Liangyou 6326, respectively. However, these As concentrations were <1.0 mg·L-1 for the rest. Compared with the control, the lengths of spout and root of Ningjing 1, Nanjing 44, Zhendao16, Wuyunjing 24 and Liangyou 6326 were decreased slightly, while decreased greatly for other rice cultivars and even died at As concentration of 3.0 mg·L-1. Under As stress, SPAD values of rice leaves didn′t significantly decreased except Ningjing 1 and Nanjing 44. Photosynthetic characteristics of nine rice cultivars responded differently to As stress of 24 h. Net photosynthenic rates of rice were increased except Suliangyou 124 and Yanliangyou 888. Intercellular CO2 concentrations, conductance to H2O, and transpiration rate of most of rice cultivars were decreased under As stress. The present results provide important information for screening out rice cultivars with high tolerance to As. |
| HTML
查看全文
查看/发表评论 下载PDF阅读器 |
|
|
|
