Department of Crop Science and Technology, College of Agriculture, South China Agricultural University, Guangzhou, 510642, China.
Scientific Observing and Experimental Station of Crop Cultivation in South China, Ministry of Agriculture, Guangzhou, 510642, China.
Sci Rep. 2019 Mar 13;9(1):4311. doi: 10.1038/s41598-019-40849-3.
The aim of this study was to determine the effects of sodium selenate (15, 30, 45, 60, 75, 90, and 105 mg kg) on the germination and seedling growth of Changnongjing 1 rice (Oryza sativa L.) at 25 °C and 30 °C. Low selenate concentrations induced shorter and more uniform germination periods than did ultrapure water at both temperatures. Seedlings primed with low selenate concentrations were superior to those primed with ultrapure water in terms of plant height, fresh weight, dry matter accumulation, and soluble carbohydrate and protein contents. Lower selenate concentrations (15-75 mg kg) induced higher chlorophyll and phenol contents in seedlings than did ultrapure water. Lower selenate concentrations also increased the superoxide dismutase (SOD), peroxidase (POX), catalase (CAT), and glutathione peroxidase (GPx) contents in seedlings and significantly decreased the stress-related malondialdehyde (MDA) content compared to ultrapure water. In conclusion, rice seedling germination and growth were promoted by priming with low selenate concentrations (15-75 mg kg) but inhibited by priming with high selenate concentrations (90-105 mg kg).
本研究旨在确定亚硒酸钠（15、30、45、60、75、90 和 105mg/kg）对 25°C 和 30°C 下长农粳 1 号水稻（Oryza sativa L.）种子萌发和幼苗生长的影响。在两种温度下，低浓度亚硒酸盐诱导的萌发期比超纯水更短且更均匀。与用超纯水预处理的幼苗相比，用低浓度亚硒酸盐预处理的幼苗在株高、鲜重、干物质积累以及可溶性碳水化合物和蛋白质含量方面表现更优。较低浓度的亚硒酸盐（15-75mg/kg）诱导幼苗中叶绿素和酚类物质的含量高于超纯水。与超纯水相比，较低浓度的亚硒酸盐还增加了幼苗中超氧化物歧化酶（SOD）、过氧化物酶（POX）、过氧化氢酶（CAT）和谷胱甘肽过氧化物酶（GPx）的含量，并且显著降低了与胁迫相关的丙二醛（MDA）含量。总之，用低浓度亚硒酸盐（15-75mg/kg）预处理可促进水稻种子的萌发和生长，但用高浓度亚硒酸盐（90-105mg/kg）预处理则会抑制其萌发和生长。
