Photosynthetica 2023, 61(3):285-296 | DOI: 10.32615/ps.2023.018

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

H.D. RAUB1, N. RAJAN2, K.J. MCINNES2, J.B. WEST1
1 Department of Ecology and Conservation Biology, Texas A&M University, College Station, TX 77843, USA
2 Department of Soil and Crop Sciences, Texas A&M University, College Station, TX 77843, USA

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.

Additional key words: carbon cycling; drought avoider; drought tolerant; grasslands; nonphotochemical quenching; savannas.

Received: December 3, 2022; Revised: April 15, 2023; Accepted: April 18, 2023; Prepublished online: May 25, 2023; Published: October 5, 2023  Show citation

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RAUB, H.D., RAJAN, N., MCINNES, K.J., & WEST, J.B. (2023). Excess energy and photosynthesis: responses to seasonal water limitations in co-occurring woody encroachers of the semi-arid Southern Great Plains. Photosynthetica, 61(3), 285-296. doi: 10.32615/ps.2023.018
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