Journal of Stress Physiology & Biochemistry, Vol. 9 No. 3 2013, pp. 199-206 ISSN 1997-0838
Original Text Copyright (cc) 2013 by  Bayat, Noghondar, Neamati, Nezami



ORIGINAL ARTICLE
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Exogenous application of ascorbic acid alleviates chilling injury in apricot (Prunus armeniaca L. cv. Shahroudi) flowers

Hassan Bayat1*, Morteza Alirezaie Noghondar1, Hossein Neamati1, Ahmad Nezami2

1 Department of Horticultural science, Faculty of Agriculture, Ferdowsi University of Mashhad, Mashhad, Iran.
2 Department of Agronomy and Plant Breeding, Faculty of Agriculture, Ferdowsi University of Mashhad, Mashhad, Iran.


*E-Mail: hassanbayat55@gmail.com


Received  March 19, 2013

One of the most important limiting factors in spread of apricot in Iran is late spring frost, which damages flower bud and decrease total yield of crop. It has been found that ascorbic acid (AA) plays a beneficial role during plant response to chilling and freezing stresses. To evaluate the effects of AA on alleviating of cold stress, the flower buds of Prunus armeniaca L. cv. Shahroudi were sprayed at pink cluster stage with AS at 4 levels (0, 100, 200 and 300 mg. L-1) and were then exposed to artificial cold stress (4 h at –4 C) or without cold stress (+ 25C). Experimental attributes including electrolyte leakage (EL) of flower buds and percentage of damage of pistil, anthers and petals to temperature treatments were determined. The results showed that at - 4C the lowest and highest percentage of damage and EL of flower buds were observed in application of 200 and 0 mg. L-1 AA, respectively. The highest and lowest percentage of damage of flower organs and EL were obtained in application of 300 and 200 mg. L-1 AA, respectively at + 25 C. Based on the results of this experiment, AA alleviates the negative effect of cold stress on EL and flower organ damages in apricot cv. Shahroudi, depending on the concentrations of AA used. 


Key words:     electrolyte leakage, foliar spray, pink cluster, stress 

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