农业环境科学学报Issue(6)：1067-1074,8.DOI:10.11654/jaes.2014.06.002
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
摘要
Abstract
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 inhib-ited 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 de-creased 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.关键词
砷/水稻/发芽率/光合生理Key words
arsenic/rice/germination rate/photosynthetic characteristics分类
资源环境引用本文复制引用
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,(6):1067-1074,8.基金项目
国家自然科学基金青年基金项目（41001190，41103039，41101294，41205087）；土壤与农业可持续发展国家重点实验室项目（Y052010018）；中国科学院土壤环境与污染修复重点实验室项目（南京土壤研究所）；江苏省政府留学奖学金项目；大学生实践创新训练计划项目 （）
