Effect of NaCl Stress on Growth, Water Relations, Organic and Inorganic Osmolytes Accumulation in Sunflower (Helianthus annuus L.) Lines
Journal Title: Universal Journal of Environmental Research and Technology - Year 2011, Vol 1, Issue 3
Abstract
Salinity is one of the important abiotic stresses that affect growth, physiology, biochemistry and molecules of plants. In this study, response of 12 sunflower (H. annuus) lines to NaCl salinity (0, 100 and 200 mM NaCl) was investigated in hydroponic culture system. Plant growth parameters, height, third leaf water status, relative membrane permeability (RMP), organic and inorganic osmolytes were measured 30 days after salinity induced. Among the lines, R2, R56 and R50 showed significantly smaller reduction in growth parameters compared with B11, B353, B25 and B15 indicating that the former lines were more salt tolerant than the others. The line R2showed less reduction in height and this result revealed that high correlation between height and growth parameters. Relative water content (RWC) was decreased under salinity stress and the lines not differed significantly in this water relation attribute. Leaf water potential (LWP) was increased under salinity but the lines showed contrary relation with growth parameters. Appears that LWP not efficient method to measured water status under greenhouse conditions. RMP in tolerant lines was lowest compared with other lines. Also, glycine betaine (GB) was enhanced under salinity stress but non-significant differences were observed among the lines for this compatibility solute. It seems GB had less important role in sunflower due to it was lowest osmolyte that accumulated under salinity condition. In tolerant lines proline was more accumulated compared with sensitive lines and it was 1.94 times further. The relationship between Na and K cations indicate that at least in sunflower, accumulation of K+ dependent to Na+ influx. In other words, the lines that accumulate high Na+ was have more K+ content and vice versa. Also, in this study, the K+ content was increased under salinity but the K+/Na+ was decreased.
Authors and Affiliations
Ahmad Heidari, Mahmoud Toorchi, Ali Bandehagh and Mohammad-Reza Shakiba
Keywords
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