Indian Journal of Agricultural Research article published in Volume 48 Issue 4 (August 2014):- EFFECTS OF EXOGENOUS ABA APPLICATION ON STOMATAL REGULATION OF GAS EXCHANGE PARAMETERS AND CALCULATED WATER USE EFFICIENCY IN MAJOR PULSES OF TAMIL NADU, INDIA Dhashnamurthi Vijayalakshmi*, Sanchita Kukde Vijay, Prashanthi Ramakrishnan, Sathiakumar Periyasamy, Srividhya Sundaram and Vijayalakshmi Chenniappan Department of Crop Physiology, Tamil Nadu Agricultural University, Coimbatore – 641 003, India Received: 08-07-2013 Accepted: 10-05-2014 doi:10.5958/0976-058X.2014.00668.4 ABSTRACT An experiment was conducted to study 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 photosynthetic rate, leaf area, Total Dry Matter Production (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. Key words: ABA, Photosynthesis, Pulses, Stomatal conductance, Transpiration, Water Use Efficiency (WUE). Source: arccjournals/index.php/journals-arcc/issue/66
Posted on: Tue, 05 Aug 2014 13:20:06 +0000
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