The Role of Phytohormones in Alleviating Salt Stress in Crop Plants (Report)
Australian Journal of Crop Science 2011, June, 5, 6
Australian Journal of Crop Science
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Introduction Plants are frequently subjected to the environmental stress such as water deficit, freezing, heat and salt stress. Salinity is one of the most common environmental stress factors. Salinity adversely affects plant growth and development, hindering seed germination (Dash and Panda, 2001), seedling growth (Ashraf et al., 2002), enzyme activity (Seckin et al., 2009), DNA, RNA, protein synthesis (Anuradha and Rao, 2001) and mitosis (Tabur and Demir, 2010). However, plant species differ in their sensitivity or tolerance to salt stress (Ashraf and Harris, 2004). There have been numerous studies of the effects of salinity on plants (Jamil et al., 2007; Duan et al., 2008). Recently, investigations have focused more on the mechanisms of salt tolerance in plants (Dajic, 2006; Munns and Tester, 2008). Some researchers have used PGRs for reducing or eradicating the negative effects of salinity (Kabar, 1987; Mutlu and Bozcuk, 2000). Phytohormones suggested playing important roles in stress responses and adaptation (Sharma et al., 2005; Shaterian et al., 2005). It is thought that the repressive effect of salinity on seed germination and plant growth could be related to a decline in endogenous levels of phytohormones (Zholkevich and Pustovoytova, 1993; Jackson, 1997; Debez et al., 2001). Wang et al. (2001) clearly defined that ABA and JA will be increased in response to salinity, whereas indole-3-acetic acid (IAA) and salicylic acid (SA) are declined. For example, the exogenous application of PGRs, auxins (Khan et al., 2004), gibberellins (Afzal et al., 2005), cytokinins (Gul et al., 2000) produces some benefit in alleviating the adverse effects of salt stress and also improves germination, growth, development and seed yields and yield quality (Egamberdieva, 2009). It has been reported that exogenous application of ABA reduces the release of ethylene and leaf abscission under salt stress in plants, probably by decreasing the accumulation of toxic Cl- ions in leaves (Gomez et al., 2002). In wheat, seed germination decreased with increasing levels of salinity, while the adverse effect of salinity was alleviated by soaking seed with IAA (Gulnaz et al., 1999). In addition, exogenous IAA showed high stimulatory effect on the root and shoot growth of wheat seedling in saline condition (Egamberdieva, 2009). Growth and yield parameters of rice were significantly increased in response to application of cytokinin under salin stress (Zahir et al., 2001). In this review, the role of some phytohormones in alleviating salinity stress in crop plants has been discussed.
- 2,99 €
- Category: Industries & Professions
- Published: 01 June 2011
- Publisher: Southern Cross Publisher
- Print Length: 35 Pages
- Language: English