ECOPHYSIOLOGICAL RESPONSE OF EMMENOPTERYS HENRYITO THE HABITATS IN DIFFERENT ALTITUDES IN CHINA'S DAPAN MOUNTAIN NATURAL RESERVE

doi:10.3773/j.issn.1005-264x.2008.04.015

Abstract

Abstract:

Aims Emmenopterys henryi, an endemic species in China, is one of the Chinese national second class protective wild plants. We investigated the ecophysiological responses of E. henryi at different altitudes in Dapan Mountain, a National Nature Reserve in Eastern China, to determine ecophysiological adaptation mechanisms of the species antioxidative system.

MethodsWe studied the content of Chla、Chlb and Chl(a+b), malondialdehyde (MDA), ascorbate (AsA) and praline (Pro), the membrane permeability (MP), specific leaf area (SLA), and the activities of peroxidase (POD), catalase (CAT), superoxide dismutase (SOD) and ascorbate peroxidase (APX) in leaves of E. henryi from different altitudes (A1: 550-650 m, A2: 680-770 m, A3: 810-900 m and A4: 970-1 100 m) in Dapan Mountain.

Important findingsChla, Chlb and Chl(a+b) reduced with increasing altitude. At A4, they decreased 21.32%, 31.53% and 24.96%, respectively, compared with that in A1. SLA decreased with increasing altitude. MP and content of MDA had a similar change: reaching minimum values in A3 and maximum in A4, indicating that E. henryi was least damaged in A3 and most in A4. Pro and AsA were at their maxima in A3, 139.33% and 10.60% respectively compared with A1. The activity of SOD, POD, CAT and APX were all the weakest in A1, however, they showed different changes. The activity of SOD progressively increased, while the activity of POD, CAT and APX initially increased and then decreased, with peak of activity of POD and APX in A3 and CAT in A2. More non-enzyme antioxidant and stronger activity of enzyme were favourable for eliminating intracellular active oxygen, keeping the cell membrane in a stable condition and ensuring normal growth of plants. In general, 810-900 m (middle altitude) is the best for the growth of E. henryi, while 970-1 100 m (high altitude) is the poorest. Therefore, altitude should be considered when biodiversity conservation of E. henryi is to be carried out, especially when transplanting E. henryi from degraded areas in the wild.

Key words: Emmenopterys henryi, altitude, antioxidative system, physioecological, Dapan Mountain

KANG Hua-Jing, LIU Peng, XU Gen-Di, CHEN Zi-Lin, WEI Fu-Min. ECOPHYSIOLOGICAL RESPONSE OF EMMENOPTERYS HENRYITO THE HABITATS IN DIFFERENT ALTITUDES IN CHINA'S DAPAN MOUNTAIN NATURAL RESERVE[J]. Chin J Plant Ecol, 2008, 32(4): 865-872.

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URL: https://www.plant-ecology.com/EN/10.3773/j.issn.1005-264x.2008.04.015

https://www.plant-ecology.com/EN/Y2008/V32/I4/865

Figures/Tables 4

Fig 1 The effect of different altitudes on the chlorophyll content and specific leaf area (SLA) of Emmenopterys henryi leaves

Fig. 2 The effect of different altitudes on the MDA content and membrane permeability of Emmenopterys henryi leaves Notes see Fig. 1

Fig. 3 The effect of different altitudes on the content of Pro and AsA of Emmenopterys henryi leaves Notes see Fig. 1

Fig. 4 The effect of different altitudes on the activities of SOD, POD, CAT and APX of Emmenopterys henryi leaves Notes see Fig. 1

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