Plant Diversity ›› 2014, Vol. 36 ›› Issue (03): 310-320.doi: 10.7677/ynzwyj201413157

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Photosynthetic Acclimation of Erythrophleum guineense and Dalbergia odorifera to Winter Low Temperature in a Marginal Tropical Area

 HUANG  Wei-1、2, CAO  Kun-Fang-2   

  1. 1 Key Laboratory of Economic Plants and Biotechnology, Kunming Institute of Botany, Chinese Academy of Sciences,
    Kunming 650201, China; 2 Key Laboratory of Tropical Forest Ecology, Xishuangbanna Tropical
    Botanical Garden, Chinese Academy of Sciences, Mengla 666303, China
  • Received:2013-07-29 Online:2014-05-25 Published:2013-09-16
  • Supported by:

    National Natural Science Foundation of China (grant 30900174)

Abstract:

In marginal tropical areas, air temperature in winter usually decreases by 10℃ compared with summer at night/day. Although tropical plants are sensitive to low temperature, the mechanism underlying photosynthetic acclimation of tropical trees to winter low temperature is unclear. To address this question, the photosystem I (PSI) and photosystem II (PSII) activities, and energy distribution in PSI and PSII were examined in summer and winter in two tropical highquality timber tree species Erythrophleum guineense and Dalbergia odorifera grown in a marginal tropical area (21°54′N, 101°46′E). Our results indicated that the photosynthetic apparatus of Eguineense and Dodorifera was maintained stable in winter. The effective quantum yield of PSII decreased significantly in winter, but nonphotochemical quenching (NPQ) significantly increased. In winter, cyclic electron flow (CEF) was significantly stimulated in both species, which was significantly and positively correlated with NPQ. Meanwhile, the stimulation of CEF led to an increase in P700 oxidation ratio and the overreduction of PSI acceptor side was prevented. Antimycin A (a specific inhibitor of PGR5dependent CEF) significantly aggravated PSII photoinhibition under high light in both species. These results suggested that stimulation of CEF is an important mechanism for photosynthetic acclimation to winter low temperature in a marginal tropical area in the two tropical tree species.

Key words:  Acclimation, Cyclic electron flow, Winter, Photosystem I, Photosystem II, Tropical trees

CLC Number: 

  • Q 945