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Effect of high light and desiccation on photosystem Ⅱ in the seedlings and mature plants of tropical seagrass
Enhalus acoroides during low tide- Journal of Oceanology and Limnology Vol. 41, Issue 1, Pages: 241-250(2023)
- Affiliations：
1.CAS and Shandong Key Laboratory of Experimental Marine Biology, Center for Ocean Mega-Science, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China
2.Laboratory for Marine Biology and Biotechnology, Pilot National Laboratory for Marine Science and Technology(Qingdao), Qingdao 266237, China
- Author bio：
Jianguo LIU, E-mail: jgliu@qdio.ac.cn
- Funds：
DOI：10.1007/s00343-021-1170-2
CLC：Received：14 June 2021，
Accepted：13 September 2021，
Online First：04 December 2021，
Published：2023-01
- Accepted：
Scan QR Code
Xingkai CHE, Hu LI, Litao ZHANG, et al. Effect of high light and desiccation on photosystem Ⅱ in the seedlings and mature plants of tropical seagrass
Enhalus acoroides during low tide[J]. Journal of Oceanology and Limnology, 2023, 41(1): 241-250.Xingkai CHE, Hu LI, Litao ZHANG, et al. Effect of high light and desiccation on photosystem Ⅱ in the seedlings and mature plants of tropical seagrass
Enhalus acoroides during low tide[J]. Journal of Oceanology and Limnology, 2023, 41(1): 241-250. DOI： 10.1007/s00343-021-1170-2.
摘要
Abstract
During low tide
the intertidal seagrass
Enhalus acoroides
is often exposed to high light and desiccation
which can seriously threaten its survival
at least partly by inhibiting photosystem Ⅱ (PSII) activity. The response of leaves of
E. acoroides
to high light and desiccation was compared for seedlings and mature plants. Results show that the resistance of seedling and mature leaves to high light was quite similar
but to desiccation was very different. Seedling leaves were more sensitive to desiccation than the mature plant leaves
but had better water retention. The damage of desiccation to seedling leaves was mainly caused by dehydration
whereas that to mature plant leaves was caused by hypersaline toxicity. The recovery rate of PSII of seedling leaves was significantly slower than that of the mature plants after the stresses disappeared
which may at least partly contribute to seedling mortality in the wild. In addition
compared to high light
desiccation seriously inhibited the recovery rate of PSII activities even if the leaves became fully rehydrated to their normal relative water content (RWC) in the following re-immersion. Desiccation inhibited the recovery rate of RC/CS
M
(reaction center per cross section (at
t
=
t
F
m
)) to decrease the production of assimilatory power
which maybe the cause of the slower PSII recovery in desiccation treatments. This study demonstrates that desiccation particularly coupling with high light have a very negative effect on the PSII of
E. acoroides
during low tide and the sensitivity of seedlings and mature plants to desiccation is significantly different
which have important reference significance to choose an appropriate transplanting depth where seedlings and mature plants of
E. acoroides
not only receive sufficient light for growth
but also that minimize desiccation stress during low tide.
关键词
Keywords
references
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