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
ORIGINAL ARTICLE
Data source : Google Scholar
QueryDate : 2016-12-24
Cites : 1
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.
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.
