Endogenous ABA as a Hormonal Intermediate in the Salicylic Acid Induced Protection of Wheat Plants Against Toxic Ions
We have previously suggested that endogenous abscisic acid (ABA) may play a role of hormonal intermediate in the implementation of the salicylic acid (SA) induced protection of wheat plants against abiotic stress factors. With the use of an inhibitor of A
- PDF / 2,091,540 Bytes
- 22 Pages / 439.37 x 666.142 pts Page_size
- 15 Downloads / 162 Views
Endogenous ABA as a Hormonal Intermediate in the Salicylic Acid Induced Protection of Wheat Plants Against Toxic Ions F. M. Shakirova, M. V. Bezrukova and D. R. Maslennikova Abstract We have previously suggested that endogenous abscisic acid (ABA) may play a role of hormonal intermediate in the implementation of the salicylic acid (SA) induced protection of wheat plants against abiotic stress factors. With the use of an inhibitor of ABA biosynthesis fluridone there were obtained experimental arguments in favor of the key role of rapid reversible accumulation of ABA during the SA-treatment and maintaining elevated levels of ABA in SApretreated seedlings subjected to cadmium stress and salinity in the implementation of pre-adaptive and protective action of SA on wheat plants, respectively. Thus, it was detected that pretreatment of wheat seedlings with fluridone prevented SA-induced accumulation of ABA under normal conditions and maintenance under stress of increased ABA content in plants pre-treated with SA. This was manifested in inhibition of SA-induced effects: generation of ROS, activation of phenylalanine ammonia-lyase and antioxidant enzymes and deposition of lignin in the cell walls of roots, as well as the accumulation of wheat germ agglutinin, proline and enhanced transcription of TADHN gene coding for dehydrin that are making an important contribution to the development of plant resistance to oxidative stress and dehydration. In general, this is reflected in the prevention of SAinduced wheat resistance to the effects of toxic ions, as judged by the level of accumulation of MDA, release of electrolytes from the tissues and growth parameters of wheat seedlings. These data provide strong argument in favor of the likelihood of implementation of the endogenous ABA as a hormonal intermediate in triggering the defensive reactions under the influence of SA that form the basis for the development of SA-induced plant resistance to cadmium stress and sodium chloride salinity.
F. M. Shakirova (&) M. V. Bezrukova D. R. Maslennikova Institute of Biochemistry and Genetics, Ufa Scientific Centre, Russian Academy of Sciences, pr. Octyabrya, 71, 450054 Ufa, Russia e-mail: [email protected]
S. Hayat et al. (eds.), Salicylic Acid, DOI: 10.1007/978-94-007-6428-6_7, Ó Springer Science+Business Media Dordrecht 2013
119
120
F. M. Shakirova et al.
Keywords Salicylic acid Abscisic acid Wheat germ agglutinin Dehydrin Proline Prooxidant-antioxidant balance Cadmium stress Salinity Triticum aestivum
1 Introduction Salicylic acid (SA) being an endogenous regulator of growth and development of phenolic nature has gained great attention due to its practical importance for increasing plant resistance to stress and productivity. The great attention to SA was initiated by the discovery of its key role in induction of systemic acquired resistance (SAR), on the basis of which is the expression of SA-sensitive genes for PR(pathogenesis-related) proteins (Metraux 2002; An and Mou 2011). The knowledge about SA s
Data Loading...
