红海榄幼苗根系呼吸代谢对水淹胁迫的响应

doi:10.11978/2021189

Abstract

Abstract:

In this study, artificial-tidal systems (0, 6, 12, 18 h·d^-1) were employed to explore the effect of waterlogging on respiratory metabolism in the roots of Rhizophora stylosa. The results showed that 6 h·d^-1waterlogging treatment appeared to has little negative effect on plant growth. However, the biomass yield efficiency decreased significantly with the elongation of waterlogging duration. Tricarboxylic acid respiratory rate, adenosine-triphosphate content, and the activities of succinate dehydrogenase and malate dehydrogenase were also obviously inhibited by long-duration waterlogging, especially in the treatment of 18 h·d^-1. On the contrary, alcohol dehydrogenase, lactate dehydrogenase, and the contents of alcohol and lactate increased with the elongation of waterlogging duration. In summary, although anaerobic respiration can partly alleviate energy deficiency caused by the inhibition of tricarboxylic acid cycle, excessive waterlogging would disrupt normal growth and metabolism of R. stylosa, leading to declined adenosine-triphosphate productivity and increased anaerobic fermentative metabolites.

Key words: waterlogging, Rhizophora stylosa, anaerobic respiration, tricarboxylic acid cycle

CLC Number:

Q945.78

CHENG Hao, WANG Youshao, MA Xiaoyu. Response of respiratory metabolism in the roots of Rhizophora stylosa to waterlogging[J].Journal of Tropical Oceanography, 2022, 41(6): 12-19.

Figures/Tables 5

Tab. 1

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References 46

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水淹处理/(h·d^-1)	地下根系生物量/g	地上茎叶生物量/g	总生物量/g	地下根系生物量/地上茎叶生物量
0	3.40 ± 0.18^a	4.19 ± 0.14^a	7.59 ± 0.31^a	0.81 ± 0.02^a
6	3.41 ± 0.09^a	4.45 ± 0.19^a	7.86 ± 0.26^a	0.77 ± 0.03^b
12	2.79 ± 0.14^b	4.22 ± 0.13^a	7.01 ± 0.27^b	0.66 ± 0.02^c
18	2.26 ± 0.10^c	3.79 ± 0.10^b	6.05 ± 0.20^c	0.59 ± 0.01^d

Response of respiratory metabolism in the roots of Rhizophora stylosa to waterlogging

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