ABA INDUCED CHANGES IN PIGMENT CONTENTS, PHOTOSYNTHETIC GAS EXCHANGE CHARACTERISTICS, LEAF AREA AND DRY MATTER ACCUMULATION OF THREE IMPORTANT PULSES
Keywords:
Pulses, ABA, Stomatal Conductance, Photosynthesis, Transpiration, Pigment Contents, Leaf Area, Total Dry Matter AccumulationAbstract
The response of three important pulses (Soyabean, greengram and blackgram) to exogenously applied ABA was studied in a pot culture experiment at TNAU, Coimbatore. Effects of drought stress on pulses show that photosynthesis and stomatal aperture are regulated by chemical signals. However, there are no studies to show how the stomatal aperture is controlled by these chemical signals, Abscisic acid (ABA). Hence, this study was aimed to find out the ABA-induced changes in gas exchange parameters, in ruling varieties of soybean, green gram and black gram and to identify the crops that can show improvement in water use efficiency by maintaining higher photosynthetic rates coupled with less transpiration rates by ABA treatments. All the pulses were grown under well-watered conditions and treated with ABA. Exogenous application of 10-5M ABA solution for three consecutive days after 22nd day from sowing showed significant variations in gas exchange parameters. Stomatal conductance declined in all pulses, while photosynthesis, leaf area, TDMP and photosynthetic pigments showed high stability in greengram, with the sprays of ABA. Transpiration rate were increased in soyabean and blackgram, while greengram maintained a low transpiration rate compared to its control. It is clear that ABA induced changes constitute an improvement in water-use efficiency in greengram, which may be invoked under prolonged drought conditions.
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