title: Differences in physiological features associated with aluminum tolerance in Tibetan wild and cultivated barleys.
abstract: Aluminum (Al) toxicity is a major limiting factor for plant production in acid soils. Wild barley germplasm is a treasure trove of useful genes and offers rich sources of genetic variation for crop improvement. Al-stress-hydroponic-experiments were performed, and the physiochemical characteristic of two contrasting Tibetan wild barley genotypes (Al-resistant XZ16 and Al-sensitive XZ61) and Al-resistant cv. Dayton were compared. Ultrastructure of chloroplasts and root cells in XZ16 was less injured than that in Dayton and XZ61. Moreover, XZ16 secreted significantly more malate besides citrate and exhibited less Al uptake and distribution than both of XZ61 and Dayton in response to Al stress, simultaneously maintained higher H⁺-, Ca²⁺Mg²⁺- and total-ATPase activities over XZ61. The protein synthesis inhibitor cycloheximide reduced citrate secretion from XZ16, but not from Dayton. In Tibetan wild barley, our findings highlight the significant correlations between Al tolerance, ATPase activity and citrate secretion, providing some insights into the physiological basis for Al-detoxification.
authors.affiliation: Department of Agronomy, College of Agriculture and Biotechnology, Zijingang Campus, Zhejiang University, Hangzhou 310058, PR China.
authors.forename: Huaxin
authors.initials: H
authors.lastname: Dai
authors.affiliation: Department of Agronomy, College of Agriculture and Biotechnology, Zijingang Campus, Zhejiang University, Hangzhou 310058, PR China.
authors.forename: Jing
authors.initials: J
authors.lastname: Zhao
authors.affiliation: Department of Agronomy, College of Agriculture and Biotechnology, Zijingang Campus, Zhejiang University, Hangzhou 310058, PR China.
authors.forename: Imrul Mosaddek
authors.initials: IM
authors.lastname: Ahmed
authors.affiliation: Department of Agronomy, College of Agriculture and Biotechnology, Zijingang Campus, Zhejiang University, Hangzhou 310058, PR China.
authors.forename: Fangbin
authors.initials: F
authors.lastname: Cao
authors.affiliation: School of Science and Health, Hawkesbury Campus, University of Western Sydney, NSW 2753, Australia.
authors.forename: Zhong-Hua
authors.initials: ZH
authors.lastname: Chen
authors.affiliation: Department of Agronomy, College of Agriculture and Biotechnology, Zijingang Campus, Zhejiang University, Hangzhou 310058, PR China.
authors.forename: Guoping
authors.initials: G
authors.lastname: Zhang
authors.affiliation: Department of Agriculture, Government of Western Australia, 3 Baron-Hay Court, South Perth WA6151, Australia. Electronic address: chengdao.li@agric.wa.gov.au.
authors.forename: Chengdao
authors.initials: C
authors.lastname: Li
authors.affiliation: Department of Agronomy, College of Agriculture and Biotechnology, Zijingang Campus, Zhejiang University, Hangzhou 310058, PR China. Electronic address: wufeibo@zju.edu.cn.
authors.forename: Feibo
authors.initials: F
authors.lastname: Wu
mesh_terms: D000222:Adaptation, Physiological / Q000235:genetics*; D000251:Adenosine Triphosphatases / Q000235:genetics / Q000378:metabolism; D000535:Aluminum / Q000378:metabolism / Q000633:toxicity*; D002118:Calcium / Q000378:metabolism; D002736:Chloroplasts / Q000648:ultrastructure; D019343:Citric Acid / Q000378:metabolism*; D005838:Genotype; D001467:Hordeum / Q000235:genetics* / Q000378:metabolism / Q000502:physiology / Q000648:ultrastructure; D008274:Magnesium / Q000378:metabolism; D008293:Malates / Q000378:metabolism*; D010940:Plant Proteins / Q000235:genetics / Q000378:metabolism; D018517:Plant Roots / Q000166:cytology / Q000378:metabolism; D013312:Stress, Physiological / Q000235:genetics*
chemical_list: D008293:Malates; D010940:Plant Proteins; D019343:Citric Acid; C030298:malic acid; D000535:Aluminum; D000251:Adenosine Triphosphatases; D008274:Magnesium; D002118:Calcium
keywords: ATPase; Aluminum toxicity; Citrate and malate secretion; Genotypic difference; Low pH; Tibetan wild barley