caa a22 4500 605480532 CHVBK 20210128100416.0 cr unu---uuuuu 210128e20150301xx s 000 0 eng 10.1007/s11099-015-0070-0 doi (NATIONALLICENCE)springer-10.1007/s11099-015-0070-0 Gas-exchange response of almond genotypes to water stress [Elektronische Daten] [S. Karimi, A. Yadollahi, K. Arzani, A. Imani, M. Aghaalikhani] We studied water relations and gas exchange in six almond genotypes grafted on GF677 in response to withholding irrigation for 14 days and a subsequent 10-day rehydration period. The responses to drought stress significantly differed in the almond genotypes; the tolerant plants were distinguished and monitored. Leaf relative water content (RWC) decreased by more than 23%, leaf water potential dropped to less than −4.3 MPa, and electrolyte leakage increased to 43% in dehydration-sensitive genotypes. Photosynthesis (P N) and stomatal conductance (g s) of drought-sensitive genotypes were significantly reduced by 70% and 97% in response to water deficiency. Water stress significantly enhanced wateruse efficiency up to 10 folds in drought-tolerant almonds. The difference between leaf temperature and its surrounding air temperature (ΔT) increased significantly to more than 187% under water stress in drought-tolerant genotypes. In addition, the reduction in the g s and further ability to preserve RWC were involved probably in drought-tolerance mechanism in almond. Negative significant correlations were found between ΔT, P N, and g s. Based on the correlations, we suggested that ΔT could be used as a simple measurement for monitoring water stress development in the irrigation management of almond orchards. In conclusion, ‘Supernova' and the Iranian genotypes ‘6-8' and ‘B-124', were found to be more droughttolerant compared with other genotypes in this experiment. The Institute of Experimental Botany, 2015 leaf temperature nationallicence leaf water potential nationallicence photosynthetic rate nationallicence Prunus dulcis Mill nationallicence relative water content nationallicence stomatal conductance nationallicence C : control nationallicence EL : electrolyte leakage nationallicence g s : stomatal conductance nationallicence P N : photosynthetic rate nationallicence RWC : leaf relative water content nationallicence R10 : rehydration period nationallicence WS : water-stressed plants nationallicence WUE : water-use efficiency nationallicence ΔT : leaf-air temperature nationallicence ΨLeaf : leaf water potential nationallicence Karimi S. College of Abouraihan, University of Tehran, P.O. Box 33955-159, Tehran, Iran aut Yadollahi A. Department of Horticultural Science, Tarbiat Modares University, P.O. Box 14115-336, Tehran, Iran aut Arzani K. Department of Horticultural Science, Tarbiat Modares University, P.O. Box 14115-336, Tehran, Iran aut Imani A. Department of Horticultural Science, Seed and Plant Improvement Institute, Karaj, Iran aut Aghaalikhani M. Department of Crop Science, Tarbiat Modares University, P.O. Box 14115-336, Tehran, Iran aut Photosynthetica The Institute of Experimental Biology of the Czech Academy of Sciences 53/1(2015-03-01), 29-34 0300-3604 53:1<29 2015 53 11099 https://doi.org/10.1007/s11099-015-0070-0 text/html Onlinezugriff via DOI BK010053 XK010053 XK010000 Metadata rights reserved Springer special CC-BY-NC licence nationallicence 1 research-article jats NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE 856 40 https://doi.org/10.1007/s11099-015-0070-0 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Karimi S. College of Abouraihan, University of Tehran, P.O. Box 33955-159, Tehran, Iran aut NATIONALLICENCE 700 1- Yadollahi A. Department of Horticultural Science, Tarbiat Modares University, P.O. Box 14115-336, Tehran, Iran aut NATIONALLICENCE 700 1- Arzani K. Department of Horticultural Science, Tarbiat Modares University, P.O. Box 14115-336, Tehran, Iran aut NATIONALLICENCE 700 1- Imani A. Department of Horticultural Science, Seed and Plant Improvement Institute, Karaj, Iran aut NATIONALLICENCE 700 1- Aghaalikhani M. Department of Crop Science, Tarbiat Modares University, P.O. Box 14115-336, Tehran, Iran aut NATIONALLICENCE 773 0- Photosynthetica The Institute of Experimental Biology of the Czech Academy of Sciences 53/1(2015-03-01), 29-34 0300-3604 53:1<29 2015 53 11099