Stomatal Regulation and Osmotic Adjustment in Sorghum in Response to Salinity

Pablo Rugero Magalhães Dourado, Edivan Rodrigues de Souza, Monaliza Alves dos Santos, Cintia Maria Teixeira Lins, Danilo Rodrigues Monteiro, Martha Katharinne Silva Souza Paulino and Bruce Schaffer
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Pablo Rugero Magalhães Dourado: Agronomy Department, Av. Dom Manuel de Medeiros, Dois Irmãos, Recife CEP 52171-900, Brazil
Edivan Rodrigues de Souza: Agronomy Department, Av. Dom Manuel de Medeiros, Dois Irmãos, Recife CEP 52171-900, Brazil
Monaliza Alves dos Santos: Agronomy Department, Av. Dom Manuel de Medeiros, Dois Irmãos, Recife CEP 52171-900, Brazil
Cintia Maria Teixeira Lins: Agronomy Department, Av. Dom Manuel de Medeiros, Dois Irmãos, Recife CEP 52171-900, Brazil
Danilo Rodrigues Monteiro: Agronomy Department, Av. Dom Manuel de Medeiros, Dois Irmãos, Recife CEP 52171-900, Brazil
Martha Katharinne Silva Souza Paulino: Agronomy Department, Av. Dom Manuel de Medeiros, Dois Irmãos, Recife CEP 52171-900, Brazil
Bruce Schaffer: Tropical Research and Education Center, Department of Horticultural Sciences, Institute of Food and Agricultural Sciences, University of Florida, 18905 S.W. 280 Street, Homestead, FL 33031, USA

Agriculture, 2022, vol. 12, issue 5, 1-12

Abstract: Sorghum bicolor (L.) Moench, one of the most important dryland cereal crops, is moderately tolerant of soil salinity, a rapidly increasing agricultural problem due to inappropriate irrigation management and salt water intrusion into crop lands as a result of climate change. The mechanisms for sorghum’s tolerance of high soil salinity have not been elucidated. This study tested whether sorghum plants adapt to salinity stress via stomatal regulation or osmotic adjustment. Sorghum plants were treated with one of seven concentrations of NaCl (0, 20, 40, 60, 80, or 100 mM). Leaf gas exchange (net CO 2 assimilation (A), transpiration (Tr); stomatal conductance of water vapor (gs), intrinsic water use efficiency (WUE)), and water ( Ψw ), osmotic ( Ψo ), and turgor Ψt potentials were evaluated at 40 days after the imposition of salinity treatments. Plants exhibited decreased A, gs, and Tr with increasing salinity, whereas WUE was not affected by NaCl treatment. Additionally, plants exhibited osmotic adjustment to increasing salinity. Thus, sorghum appears to adapt to high soil salinity via both osmotic adjustment and stomatal regulation.

Keywords: stomatal conductance; transpiration; net CO 2 assimilation; water and osmotic potentials; salt tolerance (search for similar items in EconPapers)
JEL-codes: Q1 Q10 Q11 Q12 Q13 Q14 Q15 Q16 Q17 Q18 (search for similar items in EconPapers)
Date: 2022
References: View complete reference list from CitEc
Citations: View citations in EconPapers (7)

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