Salinity stress mitigation in B. juncea by putrescine : a pleiotropic effect
2009
Mishra, S.N. | Lakra, N. | Tomar, P.C. | Makkar, K. | Rajam, M.V.
The salt stress mitigation by putrescine (Put) was evaluated in terms of endogenous titre of polyamines, proline, Na+lK+ and changing protein profile of leaf and root tissues of the B. juncea cv. RH-30 seedlings under salinity (70 - 175 mM NaCl). Put supplementation controlled the decline in endogenous level of Put and spermidine in salt stressed seedlings. The proline accumulation was considerably high in both tissues of the seedlings at 175 mM NaCI with supplementation of Put. The higher Na+ content in root than leaf, increased further with seedling age and salinity level was reduced by Put. However, the salinity caused decline in K+ content in both tissues did not respond with Put application. Put increased protein contents in stressed seedlings root and leaf tissues. The Put induction of some new proteins of 23, 26, 29 kDa in leaf and 22,23,40,41,80 kDa in root tissues of the 14day seedlings might be involved in stress mitigation. The Put induction of 26 kDa protein in leaf and root. Tissues of the seedlings exposed to 175 mM NaCI was observed. Hence, the restoration of diminishing endogenous polyamines level, selective decrease in Na+ without changing in K+ content in leaf as well as in root, increased level of proline and certain specific proteins by Put application might culminated into stress mitigation in the B. \}uncea RH-30, thereby increased seedling biomass. It is suggested that salinity stress mitigation potential of Put might be a pleiotropic effect.
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