Journal of Stress Physiology & Biochemistry, Vol. 9 No. 3 2013, pp. 5-22 ISSN 1997-0838
Original Text Copyright (cc) 2013 by    Aldesuquy, Abbas, Abo-Hamed, Elhakem

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Does Glycine Betaine and Salicylic Acid Ameliorate the Negative Effect of Drought on Wheat by Regulating Osmotic Adjustment through Solutes Accumulation?

Heshmat S. Aldesuquy1, Mohamed A. Abbas1, Samy A. Abo-Hamed1 and Abeer H. Elhakem2

1 Department of Botany, Faculty of Science, Mansoura University, Egypt.
2 Department of Biology, Faculty of Science, Salman Bin Abule Aziz University, KSA.


Received December 1, 2012

A  pot  experiment was  conducted to evaluate  the  beneficial  effect of  foliar application of glycine betaine (10mM), grain presoaking in salicylic acid (0.05 M) and their interaction on drought  tolerance  of  two  wheat  (Triticum  aestivum L.)  cultivars  (sensitive,  Sakha  94  and resistant, Sakha 93). Osmotic pressure, some osmolytes concentration and grain yield were determined.  Water  stress  caused  an  increase  in  osmotic  pressure,  proline,  total  soluble nitrogen, total soluble sugars, organic acids, ions (Na+, K+, Ca+2, Mg+2 and Cl-) content as well as Na+/K+ ratio in cell sap flag leaves of both wheat cultivars. The resistant variety had higher values of osmotic pressure, proline, organic acids and ions content than the sensitive one. On the other hand, water stress induced marked decrease (P<0.05) in grain yield. The applied chemicals mitigated the effect of water stress on the used wheat cultivars. The effect was more  pronounced  with  glycine  betaine  +  salicylic  acid  treatment.  The  applied  chemicals increased  the  osmotic  pressure,  the  osmolytes  concentrations  as  well  as  the  grain  yield. Furthermore, the osmotic pressure of flag leaf sap appeared to depend on proline, TSN, TSS, organic acids and the ions content. The economic yield (grain yield) was positively correlated with proline, keto-acids and osmotic pressure but negatively correlated with TSN, TSS and citric acid.

Key words:    (Triticum aestivum L.); drought; glycine betaine; osmolytes; salicylic acid; yield

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