Subtropical lichens from the Afromontane can display rapid photosynthetic acclimation to simulated climate change.

IF 2.1 4区 生物学 Q2 PLANT SCIENCES
Photosynthetica Pub Date : 2025-03-14 eCollection Date: 2025-01-01 DOI:10.32615/ps.2025.005
N T Ndhlovu, T N Khuzwayo, F V Minibayeva, R P Beckett
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引用次数: 0

Abstract

Afromontane forests are an important part of the KwaZulu Natal region of southern Africa, having a distinctive flora with a high proportion of endemic species, and lichens are keystone members. Unlike other continental areas, KwaZulu Natal climate change is predicted to increase rainfall and cloudiness. In the present study, hydrated Afromontane lichens from both exposed and shaded microhabitats were given either constant [100 µmol(photon) m-2 s-1] or fluctuating [0, 200, 0 µmol(photon) m-2 s-1] light for 8 h a day for 3 d and changes monitored in nonphotochemical quenching (NPQ) and rates of photosynthetic electron transport. In sun but not shade collections, NPQ strongly increased following treatment with constant and fluctuating light. It seems likely that CO2 fixation may be reduced in moist thalli, and the increase in NPQ may reduce ROS formation during exposure to light while hydrated. Sun lichens can readily modify their NPQ in response to increased cloudiness and rainfall expected in KwaZulu Natal.

来自非洲山区的亚热带地衣对模拟气候变化表现出快速的光合适应。
非洲山地森林是南部非洲夸祖鲁-纳塔尔省的重要组成部分,拥有独特的植物群,特有物种的比例很高,地衣是其中的重要成员。与其他大陆地区不同,夸祖鲁-纳塔尔省的气候变化预计会增加降雨和云量。在本研究中,来自暴露和遮荫微生境的水合非洲山地衣分别被给予恒定[100µmol(光子)m-2 s-1]或波动[0,200,0µmol(光子)m-2 s-1]光照,每天8小时,持续3天,并监测非光化学猝灭(NPQ)和光合电子传递速率的变化。在光照而非遮荫条件下,NPQ在恒定光和波动光处理下显著增加。在潮湿的菌体中,二氧化碳的固定可能会减少,而NPQ的增加可能会减少水分暴露时ROS的形成。太阳地衣可以很容易地改变它们的NPQ,以应对夸祖鲁-纳塔尔省预计增加的云量和降雨量。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Photosynthetica
Photosynthetica 生物-植物科学
CiteScore
5.60
自引率
7.40%
发文量
55
审稿时长
3.8 months
期刊介绍: Photosynthetica publishes original scientific papers and brief communications, reviews on specialized topics, book reviews and announcements and reports covering wide range of photosynthesis research or research including photosynthetic parameters of both experimental and theoretical nature and dealing with physiology, biophysics, biochemistry, molecular biology on one side and leaf optics, stress physiology and ecology of photosynthesis on the other side. The language of journal is English (British or American). Papers should not be published or under consideration for publication elsewhere.
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