Salinity and hormone interactions in affecting growth, transpiration and ionic relations ofPhaseolus vulgaris

Abstract

Addition of either abscisic acid (ABA) or kinetin at 10 -6 M to salinized media (20 -120 mM NaCI) induced remarkable effects on growth of Phaseolus vulgaris plants. Whereas ABA inhibited the plant growth and the rate of transpiration, kinetin induced stimulation of both parameters. Moreover, ABA increased proline and phosphorus concentrations in the salinized plants whilst kinetin decreased them.ABA induced stimulation of the transport of K, Ca and CI from root to shoot, accumulation of K, Na and C1 in root cells and inhibits the transport of Na and accumulation of Ca. Kinetin appeared to inhibit the transport and accumulation of Na and C1, transport of K, and stimulates the accumulation of K and Ca as well as the transport of Ca. The highest influence of both ABA and kinetin was mostly observed when these hormones were used in combination with the highest concentration of NaCI (120 mM) in the medium.

Hormones-induced modifications in the response of wheat flag leaf to NaCl

“…For estimation of elements, a known amount of dry mass was digested in concentrated HNO 3 and made up to volume with distilled water. K + and Na + concentrations were measured by flame emission spectrophotometry (Younis et al 1994).…”

Identification and expression analysis of the Glycine max CYP707A gene family in response to drought and salt stresses

“…Consistent with this, over-expression of AtNCED3, a key enzyme for ABA biosynthesis, increases Arabidopsis tolerance to drought resulting from reduced transpiration rate in leaves (Iuchi et al, 2001), but over-expression of ABA 8 ′ -hydroxylase decreases ABA levels and produces ABA-deficient phenotypes (Nitsch et al, 2009), indicating ABA homeostasis is crucial for plants to cope with water stress. On the other hand, ABA stimulates accumulation and transport of proline, betaine, Na + , K + , Ca 2+ and Cl 2 (Chen and Murata, 2002;Younis et al, 1994), which can strengthen tolerance of plants to drought or osmotic stress.…”

Kinetin-induced modification in growth criteria, ion contents and water relations of sorghum plants treated with cadmium chloride

“…Determination of K + , Na + , Ca 2+ and Cd 2+ ions Sodium and K + cations were estimated by the flame photometer. Standard Na + and K + solutions with known concentrations were used to draw a standard curve against its atomic absorption (Younis et al 1994).…”