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- Title
Methane enhances aluminum resistance in alfalfa seedlings by reducing aluminum accumulation and reestablishing redox homeostasis.
- Authors
Cui, Weiti; Cao, Hong; Yao, Ping; Pan, Jincheng; Gu, Quan; Xu, Sheng; Wang, Ren; Ouyang, Zhaozeng; Wang, Qingya; Shen, Wenbiao
- Abstract
Methane (CH) is emerging as a candidate of signal molecule recently. However, whether or how CH enhances plant adaptation to aluminum (Al)-contaminated environment is still unknown. In this report, the physiological roles and possible molecular mechanisms of CH in the modulation of Al toxicity in alfalfa seedlings were characterized. Our results showed that, CH pretreatment could alleviate Al-induced seedling growth inhibition and redox imbalance. The defensive effects of CH against Al toxicity including the remission of Al-induced root elongation inhibition, nutrient disorder, and relative electrolyte leakage. Moreover, contents of organic acids, including citrate, malate, and oxalate, were increased by CH. These results were paralleled by the findings of CH regulated organic acids metabolism and transport genes, citrate synthase, malate dehydrogenase, aluminum- activated malate transporter, and aluminum activated citrate transporter. Consistently, Al accumulation in seedling roots was decreased after CH treatment. In addition, Al-induced oxidative stress was also alleviated by CH, through the regulation of the activities of anti-oxidative enzymes, such as ascorbate peroxidase, superoxide dismutase, and peroxidase, as well as their corresponding transcripts. Our data clearly suggested that CH alleviates Al toxicity by reducing Al accumulation in organic acid-dependent fashion, and reestablishing redox homeostasis.
- Subjects
ALFALFA; METHANE; ALUMINUM; ORGANIC acids; OXIDATIVE stress; HOMEOSTASIS; SUPEROXIDE dismutase; PEROXIDASE
- Publication
BioMetals, 2017, Vol 30, Issue 5, p719
- ISSN
0966-0844
- Publication type
Article
- DOI
10.1007/s10534-017-0040-z