期刊
ACTA PHYSIOLOGIAE PLANTARUM
卷 37, 期 1, 页码 -出版社
SPRINGER HEIDELBERG
DOI: 10.1007/s11738-014-1743-1
关键词
Aluminum; Citrus grandis; Citrus sinensis; Organic acid; OJIP transient; Photosynthesis; Rootstock; Scion
资金
- National Natural Science Foundation of China [30771487]
- earmarked fund for China Agriculture Research System
Four scion-rootstock combination [i.e., X/X and X/SP, 'Xuegan' (Citrus sinensis) grafted on 'Xugan' and 'Sour pummelo' (Citrus grandis), respectively, and SP/X and SP/SP, 'Sour pummelo' grafted on 'Xuegan' and 'Sour pummelo', respectively] plants were treated for 18 weeks with 0 (-Al) or 1.2 mM AlCl3 center dot 6H(2)O (+Al). Thereafter, leaf, stem and root concentrations of phosphorus and aluminum (Al), leaf and root levels of organic acids (OAs), Al-induced release of OA anions (i.e., malate and citrate), photosynthesis and chlorophyll a fluorescence (OJIP) transients were measured. Al-induced decrease of photosynthesis and damage of photosynthetic electron transport chain were less pronounced in X/X and X/SP leaves than in SP/SP and SP/X leaves, which might be related with the higher Al-induced root efflux of OA anions and leaf P concentration. C. sinensis rootstock alleviated the influences of Al-toxicity on leaf photosynthetic electron transport chain by enhancing Al-induced release of root OA anions, hence lessening Al-induced photosynthesis inhibition in SP/X plants, while the reverse was the case for C. grandis rootstock in X/SP plants. In conclusion, the tolerance of grafted Citrus plants to Al depends on the scion as well as rootstock genotype, and the scion-rootstock interaction.
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