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Diffusional and Biochemical Limitations to Photosynthesis Under Water Deficit for Field-Grown Cotton.
- Source :
-
Physiologia plantarum [Physiol Plant] 2024 Mar-Apr; Vol. 176 (2), pp. e14281. - Publication Year :
- 2024
-
Abstract
- Water deficit stress limits net photosynthetic rate (A <subscript>N</subscript> ), but the relative sensitivities of underlying processes such as thylakoid reactions, ATP production, carbon fixation reactions, and carbon loss processes to water deficit stress in field-grown upland cotton require further exploration. Therefore, the objective of the present study was to assess (1) the diffusional and biochemical mechanisms associated with water deficit-induced declines in A <subscript>N</subscript> and (2) associations between water deficit-induced variation in oxidative stress and energy dissipation for field-grown cotton. Water deficit stress was imposed for three weeks during the peak bloom stage of cotton development, causing significant reductions in leaf water potential and A <subscript>N</subscript> . Among diffusional limitations, mesophyll conductance was the major contributor to the A <subscript>N</subscript> decline. Several biochemical processes were adversely impacted by water deficit. Among these, electron transport rate and RuBP regeneration were most sensitive to A <subscript>N</subscript> -limiting water deficit. Carbon loss processes (photorespiration and dark respiration) were less sensitive than carbon assimilation, contributing to the water deficit-induced declines in A <subscript>N</subscript> . Increased energy dissipation via non-photochemical quenching or maintenance of electron flux to photorespiration prevented oxidative stress. Declines in A <subscript>N</subscript> were not associated with water deficit-induced variation in ATP production. It was concluded that diffusional limitations followed by biochemical limitations (ETR and RuBP regeneration) contributed to declines in A <subscript>N</subscript> , carbon loss processes partially contributed to the decline in A <subscript>N</subscript> , and increased energy dissipation prevented oxidative stress under water deficit in field-grown cotton.<br /> (© 2024 The Authors. Physiologia Plantarum published by John Wiley & Sons Ltd on behalf of Scandinavian Plant Physiology Society.)
Details
- Language :
- English
- ISSN :
- 1399-3054
- Volume :
- 176
- Issue :
- 2
- Database :
- MEDLINE
- Journal :
- Physiologia plantarum
- Publication Type :
- Academic Journal
- Accession number :
- 38606698
- Full Text :
- https://doi.org/10.1111/ppl.14281