Impacts of saline stress on the physiology of Saccharum complex genotypes.

Knowledge of the physiological mechanisms in saline environment may boost sugarcane breeding programmes targeting abiotic stresses. Our hypothesis is that the physiology of Saccharum genotypes responds differently under salt stress. Thus, the objective of the study was to evaluate the physiological performance of Saccharum complex genotypes grown under presence and absence of saline stress. The experimental design used was randomized blocks arranged in a 32 × 2 factorial scheme (32 genotypes × 2 salinity levels). The presence of salinity provided higher mean values for photosynthetic rate in genotypes G4, G18, G22, G25 and G29 compared with the environment without salinity, with mean values (17.26, 21.49, 24.22 and 26.19 µmol CO2m?2s ?1), respectively, for internal CO2 concentration in G2, G6, G9, G14, G17, G19, G23 and G29, with mean values (323.45, 399.64, 386.88, 412.14, 366.31, 250.48, 379.10 and 380.75 µmol CO2 mol air?1), respectively, for transpiration in G18, G24, G25 and G29, with mean values (5.05, 3.30, 4.39 and 4.01 mmol H2O m?2s ?1), respectively, and for chlorophyll content in G3, G5, G6, G8, G10, G13, G20, G22, G23, G25, G31 and G32, with mean values (34.18, 43.01, 38.08, 32.38, 37.09, 37.18, 32.47, 38.38, 38.04, 36.95 and 33.32 SPAD units) respectively. Genotypes that under salt stress increase their physiological performance demonstrate superiority over others and should be considered in breeding programmes. Photosynthesis and transpiration is the most adequate combination for screening, but the spad index is the most viable tool because of its ease of determination and cost.

Bibliographic Details

Main Authors:	SIMOES, W. L., OLIVEIRA, A. R. de, TARDIN, F. D., OLIVEIRA, C. P. M. de, MORAIS, L. K. de, TEODORO, L. P. R., TEODORO, P. E.
Other Authors:	WELSON LIMA SIMOES, CPATSA; ANDERSON RAMOS DE OLIVEIRA, CPATSA; FLAVIO DESSAUNE TARDIN, CNPMS; CÍNTIA PATRÍCIA MARTINS DE OLIVEIRA, Universidade Estadual Paulista "Júlio de Mesquita Filho"; LIZZ KEZZY DE MORAIS, CPATC; LARISSA PEREIRA RIBEIRO TEODORO, Universidade Federal de Mato Grosso do Sul; PAULO EDUARDO TEODORO, Universidade Federal de Mato Grosso do Sul.
Format:	Artigo de periódico biblioteca
Language:	Ingles English
Published:	2021-12-15
Subjects:	Estresse abiótico, Tolerância, Sudorese, Clorofila, Fotossíntese, Salinidade, Cana de Açúcar, Saccharum Officinarum, Abiotic stress, Sugarcane, Chlorophyll, Photosynthesis, Salinity, Salt tolerance,
Online Access:	http://www.alice.cnptia.embrapa.br/alice/handle/doc/1137818 https://doi.org/10.1111/jac.12577
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