Physiological and yield responses of contrasting upland rice genotypes towards induced drought.

Autor: da Mata CR; Programa de Pós-Graduação em Agronomia, Universidade Federal de Goiás, Av. Esperança s/n, Campus Samambaia, Goiânia, GO 74690-000 Brazil., de Castro AP; Embrapa Arroz e Feijão, Rodovia GO-462, Km 12, Zona Rural, Caixa Postal 179, Santo Antônio de Goiás, GO 75375-000 Brazil., Lanna AC; Embrapa Arroz e Feijão, Rodovia GO-462, Km 12, Zona Rural, Caixa Postal 179, Santo Antônio de Goiás, GO 75375-000 Brazil., Bortolini JC; Embrapa Arroz e Feijão, Rodovia GO-462, Km 12, Zona Rural, Caixa Postal 179, Santo Antônio de Goiás, GO 75375-000 Brazil., de Moraes MG; Departamento de Botânica, Instituto de Ciências Biológicas, Universidade Federal de Goiás, Av. Esperança s/n, Campus Samambaia, Goiânia, Goiás 74690-000 Brazil.
Jazyk: angličtina
Zdroj: Physiology and molecular biology of plants : an international journal of functional plant biology [Physiol Mol Biol Plants] 2023 Feb; Vol. 29 (2), pp. 305-317. Date of Electronic Publication: 2023 Feb 09.
DOI: 10.1007/s12298-023-01287-8
Abstrakt: Drought alters rice morphophysiology and reduces grain yield. This study hypothesized that the combined analysis of morphophysiological and agronomic traits enables a systemic approach to responses to water deficit, allowing the selection of resistance markers to upland rice. The objectives were to evaluate the effects of water deficit applied at the reproductive stage in plant water status, leaf gas exchanges, leaf non-structural carbohydrate contents, and agronomic traits in upland rice genotypes; and to verify if the analyzed variables may be applied to group the genotypes according to their tolerance level. Water deficit was induced by irrigation suppression in eight genotypes at R2-R3. Physiological and biochemical traits were evaluated at the end of the water deficit period, thenceforth irrigation was restored until grain maturation for the analysis of the agronomic traits. Water deficit reduced: Ψ w (63.64%, average); g s (28-90%); transpiration rate (40.63-65.45%); RWC from Serra Dourada to Esmeralda (43.36-61.48%); net CO 2 assimilation from Serra Dourada to Primavera (70.04-99.91%); i WUE from Esmeralda to Primavera (83.98-99.85%); i CE in Esmeralda (99.92%); 100-grain weight in CIRAD and Soberana (13.65-20.63%); and grain yield from Primavera to IAC 164 (34.60-78.85%). Water deficit increased C i from Cambará to Early mutant (79.64-215.23%), and did not affect the tiller number, shoot dry biomass, fructose, and sucrose contents. The alterations in the variables distinguished groups according to the water regime. RWC, Ψ w , leaf gas exchanges, and i CE were valuable traits to distinguish the water regime treatments, but not to group the genotypes according to the drought tolerance level.
Supplementary Information: The online version contains supplementary material available at 10.1007/s12298-023-01287-8.
Competing Interests: Conflict of interestAll authors have read and approved this version of the article, and due care has been taken to ensure the integrity of the work. No conflict of interest exists in the submission of this manuscript.
(© Prof. H.S. Srivastava Foundation for Science and Society 2023, Springer Nature or its licensor (e.g. a society or other partner) holds exclusive rights to this article under a publishing agreement with the author(s) or other rightsholder(s); author self-archiving of the accepted manuscript version of this article is solely governed by the terms of such publishing agreement and applicable law.)
Databáze: MEDLINE
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