SEASONAL CHANGES IN THE FOLIAR ANTIOXIDANT SYSTEMS IN CYCLOBALANOPSIS HELFERIANA AND TERMINTHIA PANICULATA IN THE HOT-DRY VALLEY OF THE YUANJIANG RIVER, CHINA

doi:10.3773/j.issn.1005-264x.2008.05.002

Abstract

Abstract:

Aims Hot-dry valleys in southwestern China are adverse habitats. The foliar antioxidant system of plants growing there must play an important role in protecting their photosynthetic apparatus against photo-oxidation. Our aim was to characterize the responses of the antioxidant system to seasonal changes of multiple abiotic stresses in two dominant tree species in the hot-dry valley of the Yuanjiang River, Yunnan.

Methods We chose two savanna species with different photosynthetic rates for study: the evergreen Cyclobalanopsis helferiana(oak) and drought-deciduous Terminthia paniculata(sumach). We examined changes of the two main antioxidants, ascorbate (ASC) and glutathione contents and the activities of all of the antioxidant enzymes of the water-water and ASC-glutathione cycle in these two species from the hot-rainy season to the chill-dry season and to the warm-dry season.

Important findings Both species showed the highest antioxidant activity in the chill-dry season; however, they had the highest activities of glutathione transferase and glutathione peroxidase in the subsequent warm-dry season. They had similar ASC and glutathione contents and activity of SOD, the initial enzyme of water-water cycle, but sumach displayed higher activities of most antioxidant enzymes in the water-water and ASC-glutathione cycles in all seasons compared to oak. Overall, sumach activated its antioxidant system more actively than oak, yet oak had more persistent antioxidant activity than sumach. Compared with activities of antioxidant systems of plants growing in other adverse conditions, the two study species have stronger antioxidant capacity, which is consistent with their absolutely lower contents of malondialdehyde in all seasons.

Key words: chilling, drought, multiple stresses, photo-oxidation

ZHU Jun-Jie, CAO Kun-Fang. SEASONAL CHANGES IN THE FOLIAR ANTIOXIDANT SYSTEMS IN CYCLOBALANOPSIS HELFERIANA AND TERMINTHIA PANICULATA IN THE HOT-DRY VALLEY OF THE YUANJIANG RIVER, CHINA[J]. Chin J Plant Ecol, 2008, 32(5): 985-993.

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URL: https://www.plant-ecology.com/EN/10.3773/j.issn.1005-264x.2008.05.002

https://www.plant-ecology.com/EN/Y2008/V32/I5/985

Figures/Tables 5

Table 1 Monthly rainfall and temperature during the study period from January 2003 to March 2004

月/年 Month/year	月降水 Monthly rainfall (mm)	月最低温 Monthly minimum temperature (℃)	月均温度 Monthly mean temperature (℃)	月最高温 Monthly maximum temperature (℃)
01/2003 02/2003 03/2003 04/2003 05/2003 06/2003 07/2003 08/2003 09/2003 10/2003 11/2003 12/2003 01/2004 02/2004 03/2004	67.8 5.9 37.1 10.0 66.8 141.6 136.4 121.8 48.8 36.6 0 11.8 19.4 7.6 5.4	6.5 9.6 12.1 16.3 20.2 22.1 23.3 22.8 18.3 17.8 11.1 9.2 6.4 6.7 11.1	16.1 19.1 22.5 27.3 28.9 28.2 29.3 28.4 26.5 25.6 21.1 19.0 16.6 19.1 23.5	30.0 33.9 35.7 39.5 40.1 37.5 40.2 38.3 36.9 37.3 32.8 29.7 30.4 35.4 38.7

Fig. 1 Seasonal changes of relative water content, CO2 assimilation rate, quantum yield of photosynthetic electron transport, malondialdehyde (MDA) contents and superoxide (O2-· ) radical production rate inCyclobalanopsis helferiana (oak) and Terminthia paniculata (sumach) in the hot-dry valley of Yuanjiang River

Fig. 2 Seasonal changes of ASC, dASC, GSSG and GSH content, dASC/ASC and GSH/(GSH+GSSG) ratio in Cyclobalanopsis helferiana(oak) and Terminthia paniculata (sumach) in the hot-dry valley of Yuanjiang River

Fig. 3 Seasonal changes of SOD, APX, CAT, POX activities in Cyclobalanopsis helferiana(oak) and Terminthia paniculata (sumach) in the hot-dry valley of Yuanjiang River

Fig. 4 Seasonal changes of DHAR, MDAR, GR, GP and GT activity in Cyclobalanopsis helferiana (oak) and Terminthia paniculata (sumach) in the hot-dry valley of Yuanjiang River

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