tailieunhanh - Apoplastic and symplastic solute concentrations contribute to osmotic adjustment in bean genotypes during drought stress

The present study investigates changes in the inorganic ions, proline, and endogenous abscisic acid (ABA) contents of the apoplastic and symplastic compartments of leaves from drought-tolerant (Yakutiye) and droughtsensitive (Zulbiye) cultivars of the common bean (Phaseolus vulgaris L.). Drought stress caused a decrease in leaf water potential and stomatal conductance in both cultivars. | N. SARUHAN GÜLER, A. SAĞLAM, M. DEMİRALAY, A. KADIOĞLU Turk J Biol 36 (2012) 151-160 © TÜBİTAK doi: Apoplastic and symplastic solute concentrations contribute to osmotic adjustment in bean genotypes during drought stress Neslihan SARUHAN GÜLER1, Aykut SAĞLAM2, Mehmet DEMİRALAY2, Asım KADIOĞLU2 1 Department of Biology, Faculty of Arts and Sciences, Rize University, 53100 Rize - TURKEY 2 Department of Biology, Faculty of Science, Karadeniz Technical University, 61080 Trabzon - TURKEY Received: Abstract: The present study investigates changes in the inorganic ions, proline, and endogenous abscisic acid (ABA) contents of the apoplastic and symplastic compartments of leaves from drought-tolerant (Yakutiye) and droughtsensitive (Zulbiye) cultivars of the common bean (Phaseolus vulgaris L.). Drought stress caused a decrease in leaf water potential and stomatal conductance in both cultivars. Concentrations of proline in the drought-tolerant and droughtsensitive cultivars increased in response to drought stress in both compartments. The symplastic K+ concentration decreased in both cultivars. However, the opposite trend was observed concerning K+ concentrations in the apoplastic areas. While the symplastic Na+ concentrations significantly decreased in the drought-tolerant cultivar, the apoplastic Na+ concentrations increased during drought stress. However, Na+ concentrations did not significantly change in either of the compartments in the drought-sensitive cultivar. The Ca2+ concentrations in the sensitive cultivar significantly decreased in both compartments during drought stress. In the tolerant cultivar, the Ca2+ concentration significantly increased in the symplast but decreased in the apoplast. Cl- concentrations in the tolerant cultivar did not significantly change in either compartment. In the sensitive cultivar, the Cl- concentration increased in the apoplastic area but decreased in the symplastic area. In addition, while the .