Photosynthetica, 2019 (vol. 57), issue 4

Photosynthetica 2019, 57(4):1094-1099 | DOI: 10.32615/ps.2019.128

Effects of high temperature and high light on photosystem II activity in leaves of two Bauhinia species

S.B. ZHANG1,2, Q.L. DENG3, Y.J. HAO5
1 CAS Key Laboratory of Tropical Forest Ecology, Xishuangbanna Tropical Botanical Garden, Chinese Academy of Sciences, Mengla, 666303 Yunnan, China
2 Yuanjiang Savanna Ecosystem Research Station, Xishuangbanna Tropical Botanical Garden, Chinese Academy of Sciences, Yuanjiang, 653300 Yunnan, China
3 School of Geography and Eco-tourism, Southwest Forestry University, 650224 Kunming, Yunnan, China
5 School of Ecology and Environment Conservation, Southwest Forestry University, Kunming, 650224 Yunnan, China

It is, so far, unclear whether lianas and trees differ in photosynthetic thermotolerance and response to high temperature and high light. Here, photosynthetic thermotolerance was compared in the leaves of Bauhinia brachycarpa (tree) and Bauhinia comosa (liana). Moreover, the combined treatments of four temperatures (25, 35, 40, and 45°C) and two light intensities [500 and 2,000 μmol(photon) m-2 s-1] were used to investigate the effects of high temperature and high light on PSII activity. The results showed that B. brachycarpa leaves exhibited higher photosynthetic thermotolerance, leaf mass per area, and Ca2+ concentration than those of B. comosa. As the temperature and light intensity increased, maximum quantum yield of PSII decreased significantly, particularly with greater declines in B. comosa than that in B. brachycarpa. Our results suggested that PSII was more sensitive to high temperature and high light in liana species B. comosa than in the congener tree species B. brachycarpa.

Keywords: global warming; heat stress; photoinhibition; photoprotection.

Received: July 9, 2019; Accepted: September 16, 2019; Prepublished online: October 3, 2019; Published: November 1, 2019Show citation

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ZHANG, S.B., DENG, Q.L., & HAO, Y.J. (2019). Effects of high temperature and high light on photosystem II activity in leaves of two Bauhinia species. Photosynthetica, 57(4), 1094-1099. doi: 10.32615/ps.2019.128.
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