Excess energy and photosynthesis: responses to seasonal water limitations in co-occurring woody encroachers of the semi-arid Southern Great Plains

被引:0
|
作者
Raub, H. D. [1 ]
Rajan, N. [2 ]
Mcinnes, K. J. [2 ]
West, J. B. [1 ]
机构
[1] Texas A&M Univ, Dept Ecol & Conservat Biol, College Stn, TX 77843 USA
[2] Texas A&M Univ, Dept Soil & Crop Sci, College Stn, TX 77843 USA
基金
美国食品与农业研究所; 美国国家科学基金会;
关键词
carbon cycling; drought avoider; drought tolerant; grasslands; nonphotochemical quenching; savannas; 2 EVERGREEN TREES; CHLOROPHYLL FLUORESCENCE; PLANT ENCROACHMENT; GAS-EXCHANGE; LEAF; PHOTOINHIBITION; CAROTENOIDS; DISSIPATION; VARIABILITY; ECOSYSTEMS;
D O I
10.32615/ps.2023.018
中图分类号
Q94 [植物学];
学科分类号
071001 ;
摘要
Woody plant areal encroachment is pervasive throughout the Southern Great Plains, USA. The ability of woody plants to dissipate excess solar radiation - dynamically over the day and sustained periods without recovery overnight is key for maintaining photosynthetic performance during dry stretches, but our understanding of these processes remains incomplete. Photosynthetic performance and energy dissipation were assessed for co-occurring encroachers on the karst Edwards Plateau (Juniperus ashei, Prosopis glandulosa, and Quercus fusiformis) under seasonal changes in water status. Only J. ashei experienced mild photoinhibition from sustained energy dissipation overnight while experiencing the lowest photochemical yields, minimal photosynthetic rates, and the highest dynamic energy dissipation rates at midday during the dry period - indicating susceptibility to photosynthetic downregulation and increased dissipation under future drought regimes. Neither other encroacher experienced sustained energy dissipation in the dry period, though P. glandulosa did experience marked reductions in photosynthesis, photochemical yields, and increased regulatory dynamic energy dissipation.
引用
收藏
页码:285 / 296
页数:12
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