Journal of Stress Physiology & Biochemistry, Vol. 9 No. 3 2013, pp. 61-71 ISSN 1997-0838
Original Text Copyright (cc) 2013 by   Ansari, Azadi, Sharif-Zadeh, Younesi



ORIGINAL ARTICLE
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Effect of Hormone Priming on Germination Characteristics and Enzyme Activity of Mountain Rye (Secale montanum) Seeds under Drought Stress Conditions

Ansari O.1*, Azadi M.S.2, Sharif-Zadeh F.3, Younesi E.1

1 Department of Agronomy and Plant Breeding, Faculty of Agriculture, University of Tehran, Karaj, Iran.
2 Department of Agronomy and Plant Breeding, Islamic Azad University, Dezfoul Branch, Iran.
3 College of Agriculture and Natural Resources, University of Tehran, Iran.


*E-Mail: Ansari_o@ut.ac.ir


Received  February 15, 2013

Seed  priming  techniques  have  been  used  to  increase  germination,  improve  germination uniformity and seedling establishment under stressed conditions. Seed priming was used in Rye  Mountain  (Secale  montanum)  to  increase  seed  germination  and  tolerance  on  stress exposure.  Rye  seeds  were  treated  with  various  priming  agents  for  different  time  and temperatures.  The  effect  of  priming  was  assessed  on  germination  characteristics  on subsequent exposure to drought (PEG -14 bar) stress for 7 days. Seed priming treatments significantly (p≤ 0.01) affected, Germination percentage (GP), normality seedling percentage (NSP), germination Index (GI),  germination uniformity (GU), means time to germination (MTG), coefficient of velocity of germination (CVG),  seedling vigour index (SVI) and coefficient of allometry (AC). Seed priming with gibberelic acid (GA) and salicylic acid (SA) (p≤ 0.01) increased germination  characteristics  as  the  compared  to  the  unprimed.  Seed  priming  with concentrations 25, 50 ppm of GA for 15 h at 10 C and 25 ppm of SA for 12 h at 10 C,  may be considered as optimal treatment for priming of  Secale montanum seeds in drought stress conditions. Also priming increased catalase (CAT) and ascorbate peroxidase (APX) as compared to the unprimed.

Key words:    Hormone priming, Seed germination, Drought stress, Enzyme activity, Secale montanum

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