Liu Shu-Jin, Huang Yi-Zong, Bao Qiong-Li, Huang Yong-Chun, Zhang Sheng-Nan, Han Nian, Liu Yu-Rong, Hu Hong-Qing
Agro-Environmental Protection Institute, Ministry of Agriculture, Tianjin 300191, China.
College of Resources and Environment, Huazhong Agricultural University, Wuhan 430070, China.
Huan Jing Ke Xue. 2020 Mar 8;41(3):1505-1512. doi: 10.13227/j.hjkx.201909083.
As pollution in farmland has a toxic effect on the growth of crops, which reduces their yield and quality. The effects of exogenous spermidine (Spd) on rice seed germination and seedling growth under As stress were studied. The results showed that exogenous Spd could promote the germination of rice seeds under As stress, improve the germination potential and germination rate of seeds, and promote the growth of seedling roots. The addition of Spd could increase the activity of catalase (CAT), peroxidase (POD), and superoxide dismutase (SOD) of rice seedlings and roots under As stress, and reduce the content of malondialdehyde (MDA) in rice buds and roots. When As concentration was 25 μmol·L, adding 500 μmol·L and 1000 μmol·L Spd, MDA content in rice roots was decreased by 12.3% and 31.3% and CAT activity of rice shoots was increased by 105.1% and 101.4%, and CAT activity of rice roots was increased by 29.9% and 57.1%, respectively. The addition of Spd also affected the uptake and accumulation of As in rice. When the concentration of As was 25 μmol·L, adding 500 μmol·L and 1000 μmol·L Spd, the concentration of As in rice shoots decreased by 69.4% and 75.1%, and As concentration in rice roots decreased by 7.6% and 24.4%, respectively. Spd could therefore effectively alleviate the toxic effect of As on rice.
由于农田污染对作物生长具有毒害作用，会降低作物产量和品质。研究了外源亚精胺（Spd）对砷胁迫下水稻种子萌发及幼苗生长的影响。结果表明，外源Spd能促进砷胁迫下水稻种子的萌发，提高种子的发芽势和发芽率，并促进幼苗根系生长。添加Spd能提高砷胁迫下水稻幼苗及根系中过氧化氢酶（CAT）、过氧化物酶（POD）和超氧化物歧化酶（SOD）的活性，降低水稻芽和根中丙二醛（MDA）的含量。当砷浓度为25 μmol·L时，添加500 μmol·L和1000 μmol·L的Spd，水稻根中MDA含量分别降低12.3%和31.3%，水稻地上部CAT活性分别提高105.1%和101.4%，水稻根中CAT活性分别提高29.9%和57.1%。添加Spd还影响水稻对砷的吸收和积累。当砷浓度为25 μmol·L时，添加500 μmol·L和1000 μmol·L的Spd，水稻地上部砷浓度分别降低69.
