两种红树植物不同种源幼苗对模拟高温热浪的光合生理响应差异

doi:10.11913/PSJ.2095-0837.2021.40424

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Abstract

We analyzed the impact of two days of high-temperature treatment on the leaf photosystem properties of potted seedlings of two mangrove species, i.e., cold-tolerant Kandelia obovata Sheue, H. Y. Liu & J. Yong and heat-tolerant Bruguiera gymnorrhiza (L.) Savigny, from two geographical populations in Guangxi, China (lower latitude) and Okinawa, Japan (higher latitude). The xanthophyll cycle components and chlorophyll-a and -b contents were measured. The leaf photosystemⅠ(PSⅠ) and photosystemⅡ(PSⅡ) activities were measured using a Dual-PAM-100 system. Results showed that high temperature significantly reduced the maximum photochemical efficiency (F_v/F_m) of PSⅡ in both species. The F_v/F_m values showed less decrease in the lower latitude populations than in the higher latitude populations, and less decrease in B. gymnorrhiza than in K. obovata seedlings. The P700 oxidation-reduction state (P_m) showed less decrease in the lower than higher latitude populations. The leaf non-photochemical quenching (NPQ) showed a greater increase in the lower latitude populations than in the higher latitude populations. The xanthophyll pool size (V + A + Z) and de-epoxidation ratio (A + Z)/(V + A + Z) increased following heat treatment. A greater increase was observed in the lower latitude populations than in the higher latitude populations. In addition, the (A + Z)/(V + A + Z) ratio was negatively correlated with F_v/F_m, but positively correlated with NPQ. Compared with other hardy habitats, such as savannas and Mediterranean woodlands, mangroves had the largest xanthophyll pool size. On the second day of recovery, F_v/F_m was still at 0.69 in the high-latitude K. obovata seedlings, indicating irreversible photoinhibition of PSⅡ, while all seedlings maintained a higher de-epoxidation ratio and NPQ for photosystem protection. In conclusion, the lower latitude populations showed higher adaptability to heat stress, which was partly due to strong photoprotection through the xanthophyll cycle, and there was a tradeoff between cold- and heat-tolerance between species and populations. This study revealed a novel heat tolerance mechanism in mangrove species, which has implications for their physiological responses to future changing climate.

Key words： Mangrove Photosystems High temperature stress Xanthophyll cycle Provenance

Received: 22 December 2020

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Q945

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This work was supported by grants from the National Natural Science Foundation of China (31670406) and Bagui Scholar Talent Project (33600992001)。

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	Articles by authors
	Zhang Xiao-Yan
	Alison Kim Shan Wee
	Tadashi Kajita
	Zhu Jun-Jie
	Cao Kun-Fang

Cite this article:

Zhang Xiao-Yan,Alison Kim Shan Wee,Tadashi Kajita等. Differences in photosynthetic responses to simulated heat wave in seedlings of two mangrove species from different provenances[J]. Plant Science Journal, 2021, 39(4): 424-432.

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http://www.plantscience.cn/EN/10.11913/PSJ.2095-0837.2021.40424 OR http://www.plantscience.cn/EN/Y2021/V39/I4/424

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