Effects of short-term NaCl stress on water relations and gas exchange of two jute species |
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Authors: | K Chaudhuri MA Choudhuri |
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Institution: | (1) Plant Physiology and Biochemistry Laboratory, Department of Botany, Burdwan University, Burdwan, 713 104, India |
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Abstract: | Thirty-day-old seedlings of two jute species (Corchorus capsularis L. cv. JRC 212 and C. olitorius L. cv. JRO 632) were subjected
to short-term salinity stress (160 and 200 mM NaCl for 1 and 2 d). Relative water content, leaf water potential, water uptake,
transpiration rate, water retention, stomatal conductance, net photosynthetic rate and water use efficiency of both jute species
decreased due to salinity stress. The decrease was greater in C. olitorius than in C. capsularis and with higher magnitude
of stress. Greater accumulation of Na+ and Cl- and a lower ratio of K+/Na+ in the root and shoot of C. olitorius compared
with C. capsularis were also recorded. Pretreatment of seedlings with kinetin (0.09 mM), glutamic acid (4 mM) and calcium
nitrate (5 mM) for 24 h significantly improved net photosynthesis, transpiration and water use efficiency of salinity stressed
plants, the effect being more marked in C. olitorius. Among the pre-treatment chemicals, calcium nitrate was most effective.
This revised version was published online in August 2006 with corrections to the Cover Date. |
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Keywords: | ion accumulation leaf water potential net photosynthetic rate relative water content stomatal conductance transpiration rate water use efficiency |
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