Investigation the effect of humic acid on some morphhophysiological and biochemical ‎characteristics of almond rootstocks under salinity stress

Document Type : Full Paper


1 Ph.D. Candidate, Faculty of Agriculture, University of Mohaghegh‏ ‏Ardabili, Ardabil, Iran ‎

2 Associate Professor, Faculty of Agriculture, University of Mohaghegh‏ ‏Ardabili, Ardabil, Iran ‎

3 Associate Professor, Faculty of Agriculture, Urmia University, Urmia, Iran


Choosing suitable feed sources remove the problems of salinity from the plant. For this purpose, an experiment as factorial was conducted in a RCBD with three replications at the University of Mohaghegh Ardabili during 2015-16. The first factor was humic acid (HA) application at four levels: (0, 2.5, 5 and 7 kgha-1), the second factor was salinity at four levels: (0, 60, 120 and 180mM NaCl) and the third factor was two-years old almond rootstocks seedling at two levels (GF677 and GN15). Results showed that with increasing salinity, root/stem dry weight increased, especially in GF677, Na+ and Cl and SI increased, especially in GN15 and SLA, K+ and N, leaf osmotic potential, gs, Pn and T were decreased, especially in GN15. Carbohydrates increased to 120mM NaCl, especially in GF677 and then decreased. GF677 with an increase in HA up to 5 kgha-1, in the salinity of 180mM NaCl, with the highest root/stem dry weight and SLA, the lowest Na+ and Cl-and the highest K+and N of leaf had the highest leaf osmotic potential (-1.9MPa) and carbohydrate (86.92 mg gFW-1) compared to other rootstocks. The highest gs (0.53 mmol m-2s-1) and Pn (18.73 μmolCO2 m-2s-1) were found in GF677, 2.5 kgha-1 HA and 0 mM NaCl. With increasing HA, in these conditions, the SI decreased, especially in GF677. Therefore, GF677 was evaluated as the most tolerant rootstock for salinity and 2.5 and 5 kgha-1HA was evaluated as the most appropriate levels for affecting almond rootstocks.


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