期刊
AUSTRALIAN JOURNAL OF AGRICULTURAL RESEARCH
卷 58, 期 8, 页码 811-815出版社
CSIRO PUBLISHING
DOI: 10.1071/AR06253
关键词
alfalfa; physiological change; salt stress
Salt stress is an important constraint to lucerne ( Medicago sativa L.) production in many parts of the world. Seeds of 3 lucerne varieties, cvv. Victoria, Golden Empress, and Victor, were used to investigate the effects of seed priming with 5 mu M/L brassinolide on germination and seedling growth under a high level of salt stress (13.6 dS/ m NaCl solution). The results showed that germination percentage, germination index, and vigour index of lucerne seeds primed with brassinolide were significantly higher than those of the non-primed seeds under salinity stress in each variety. Seed priming with brassinolide significantly increased the shoot fresh weight, shoot dry weight, and root dry weight in 2 varieties, and significantly increased the root length and root vigour in each variety. It also significantly increased the activities of antioxidant enzymes, peroxidase ( POD), superoxide dismutase ( SOD), and catalase ( CAT), in Victoria and Victor seedlings. During seedling growth, the primed seeds significantly reduced the malondialdehyde (MDA) accumulation. This suggests that priming lucerne seed with brassinolide at a suitable concentration can improve germination and seedling growth under high-saline soils.
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