4.7 Article

Mechanisms of aluminum-tolerance in two species of citrus: Secretion of organic acid anions and immobilization of aluminum by phosphorus in roots

期刊

PLANT SCIENCE
卷 180, 期 3, 页码 521-530

出版社

ELSEVIER IRELAND LTD
DOI: 10.1016/j.plantsci.2010.11.011

关键词

Aluminum; Citrate; Citrus grandis; Citrus sinensis; Malate; Phosphorus-deficiency

资金

  1. National Natural Science Foundation of China [30771487]
  2. Natural Science Foundation of Fujian Province of China [B0710011]

向作者/读者索取更多资源

'Sour pummelo' (Citrus grandis) and 'Xuegan' (C. sinensis) seedlings were irrigated for 18 weeks with nutrient solution containing 0 (-Al) and 1.2 mM AlCl3 center dot 6H(2)O (+Al) x 0.50 and 200 mu M KH2PO4. C sinensis was more tolerant to aluminum (Al) than C. grandis. Phosphorus (P) alleviated the toxic effects of Al on seedlings. Under Al stress, P increased root Al, but decreased shoot Al; C. sinensis accumulated more Al in roots and less Al in shoots than C. grandis. Al decreased root and shoot P. P content was higher in C. sinensis than in C. grandis seedlings. C. sinensis roots secreted more malate and citrate than C. grandis ones in response to Al. AI-induced-secretion of malate and citrate from +Al excised roots was higher than from -Al ones, while Al-preculture did not increase root malate and citrate. Al-induced-secretion of malate and citrate from +Al excised roots decreased with increasing P supply. To conclude, P can alleviate Al-toxicity through increasing immobilization of Al in roots and P level in seedlings rather than through increasing organic acid (OA) anion secretion. The higher Al-tolerance of C. sinensis may involve secretion of OA anions and precipitation of Al by Pin roots. (C) 2010 Elsevier Ireland Ltd. All rights reserved.

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