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Photosynthetic performance of glumes of oat spikelets is more stable for grain-filling stage under drought stress.
- Source :
-
Plant physiology and biochemistry : PPB [Plant Physiol Biochem] 2024 Sep; Vol. 214, pp. 108890. Date of Electronic Publication: 2024 Jun 27. - Publication Year :
- 2024
-
Abstract
- Drought stress affects plant photosynthesis, leading to a reduction in the quality and yield of crop production. Non-foliar organs play a complementary role in photosynthesis during plant growth and development and are important sources of energy. However, there are limited studies on the performance of non-foliar organs under drought stress. The photosynthetic-responsive differences of oat spikelet organs (glumes, lemmas and paleas) and flag leaves to drought stress during the grain-filling stage were examined. Under drought stress, photosynthetic performance of glume is more stable. Intercellular CO <subscript>2</subscript> concentration (Ci), chlorophyll b, maximum photochemical efficiency of photosystem II. (Fv/Fm), and electron transport rate (ETR) were significantly higher in the glume compared to the flag leaf. The transcriptome data revealed that stable expression of the RCCR gene under drought stress was the main reason for maintaining higher chlorophyll content in the glume. Additionally, no differential expression genes (DEGs) related to Photosystem Ⅰ (PSI) reaction centers were found, and drought stress primarily affects the Photosystem II (PSII) reaction center. In spikelets, the CP43 and CP47 subunits of PSII and the AtpB subunit of ATP synthase were increased on the thylakoid membrane, contributing to photosynthetic stabilisation of spikelets as a means of supplementing the limited photosynthesis of the leaves under drought stress. The results enhanced understanding of the photosynthetic performance of oat spikelet during the grain-filling stage, and also provided an important basis on improving the photosynthetic capacity of non-foliar organs for the selection and breeding new oat varieties with high yield and better drought resistance.<br />Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.<br /> (Copyright © 2024 Elsevier Masson SAS. All rights reserved.)
- Subjects :
- Chlorophyll metabolism
Plant Leaves metabolism
Plant Leaves physiology
Stress, Physiological
Gene Expression Regulation, Plant
Photosystem I Protein Complex metabolism
Edible Grain physiology
Edible Grain genetics
Edible Grain growth & development
Edible Grain metabolism
Plant Proteins metabolism
Plant Proteins genetics
Photosynthesis physiology
Avena genetics
Avena metabolism
Avena growth & development
Avena physiology
Droughts
Photosystem II Protein Complex metabolism
Subjects
Details
- Language :
- English
- ISSN :
- 1873-2690
- Volume :
- 214
- Database :
- MEDLINE
- Journal :
- Plant physiology and biochemistry : PPB
- Publication Type :
- Academic Journal
- Accession number :
- 38950462
- Full Text :
- https://doi.org/10.1016/j.plaphy.2024.108890