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EFFECTS OF HALOPRIMING ON PHOTOCHEMISTRY OF VIGNA RADIATA (L.) WILCZEK SUBJECTEDTO OSMOTIC STRESS

The investigation was carried out to study the effect of halopriming on photochemistry of three varieties subjected to NaCl/PEG stress. The changes in the photochemistry of seedlings were monitored by measuring the total chlorophyll content, PS I and II activities, chlorophyll fluorescence related parameters like density of active reaction centres (RC/CS), absorbtion of photons (ABS/CS), trapping of photons (TR/CS), electron transport (ET/CS) and dissipation of energy (DI/CS) per cross section of PS II. The application of stress resulted in the retardation of growth, total chlorophyll content, photosystem I and II activities and changes in the chlorophyll a fluorescence parameters of the seedlings. It can be concluded that halopriming treatments of the seeds could decrease the extent of reduction in the photosynthetic efficiency of the seedlings of three varieties subjected to NaCl/PEG stress and it was evident in the NaCl tolerant variety Pusa Vishal.

 





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