biologia plantarum

International journal on Plant Life established by Bohumil Němec in 1959

Biologia plantarum 43:455-457, 2000 | DOI: 10.1023/A:1026752023454

Response of Alfalfa Genotypes to Saline Water Irrigation

A. Anand1, M.J. Baig1, P.K. Mandal1
1 Division of Crop Improvement, Indian Grassland and Fodder Research Institute, Jhansi-, India

The influence of saline water (4, 8, 12 dS m-1) irrigation on gas exchange and growth response of alfalfa genotypes Anand-2, T-9 and IL-112 was studied. T-9 and IL-112 showed a significant increase in net photosynthetic rate (PN) at low salinity (4 dS m-1) compared to the control whereas Anand-2 maintained an unaltered PN. Reduction in PN at higher salinities was primarily due to reduction of stomatal conductance. There was a greater reduction in transpiration rate as compared to PN rate, which resulted in an increase in water use efficiency (WUE). High WUE may serve as one of the strategies of the plant to withstand saline environment. However, the slight increase in WUE in Anand-2 could not help in maintaining its growth. Increase in Na+ concentration in comparison to K+ concentration may also contribute to the inhibition in growth.

Keywords: Medicago sativa; photosynthetic rate; salinity; stomatal conductance; transpiration rate; water use efficiency
Subjects: alfalfa, genotypes, salinity; genotype differences, photosynthesis, water relations, salinity; Medicago sativa; net photosynthetic rate, genotypes, salinity; photosynthetic rate, genotypes, salinity; salinity, photosynthesis, water relations; stomatal conductance, genotypes, salinity; transpiration, genotypes, salinity; water-use efficiency, genotypes, salinity

Published: September 1, 2000  Show citation

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Anand, A., Baig, M.J., & Mandal, P.K. (2000). Response of Alfalfa Genotypes to Saline Water Irrigation. Biologia plantarum, 43(3), 455-457. doi: 10.1023/A:1026752023454
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