Effect of Drought and Calcium-Stresses on Two Wild Races of Pyrus Syriaca Boiss. (P. S.1 and P.S.4) and Pyrus Communis (Research Note)

Issam Fallouh, Hassan Obeid, Khalil Al-Maarri


The presented research was investigated in order to study the effect of drought and CaCl2 on two wild races of Pyrus syriaca (P.S.1, P.S.4) and Pyrus communis. Polyethylene glycol 6000 (PEG) was used at 0, and 40%, CaCl2 was added to the medium at 0, 8, and 16 g/l, to study their effect on chlorophyll fluorescence and chlorophyll content in the leaves.
Results obtained indicate no influence of (PEG) treatment on chlorophyll fluorescence. Two wild races of Pyrus syriaca showed more tolerance to drought than Pyrus communis.
The plants treated with different CaCl2 concentrations influenced chlorophyll fluorescence (Fv/Fm). The results obtained demonstrate no significant difference among all studied plant material at 8 g/l of CaCl2.
P.S. 1 was more tolerant to lime soil than P. S. 4 and Pyrus communis. A significant decrease in chlorophyll content at the treatment with 16 g/l of CaCl2 was indicated. It was 2.1 mg/g in Pyrus communis compared to 2.4 and 2.3 mg/g fresh material, respectively in Pyrus syriaca P. S.1 and P.S .4.


Drought, calcium, chlorophyll fluorescence, chlorophyll, Pyrus syriaca Boiss., pyrus communis.

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