Physiological Characterization of Rice Genotypes for Zinc Efficiency (ZE)
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Date
2016-09
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University of Agricultural Science, Dharwad
Abstract
A pot and field experiments were conducted during kharif 2013 and 2014 at ARS, Mugad, UAS, Dharwad, to characterize the rice genotypes for zinc efficiency on physiological basis. Field experiments were comprised of 20 genotypes in combination with three treatments viz., control; soil application of ZnSO4 (20 kg ha-1) and foliar application of ZnSO4 @ 0.5 per cent at 50 per cent flowering. Similarly, pot experiment consisted of same genotypes with and without Zn. The hydroponic experiment was also conducted with Zn deficient and sufficient condition at the Department of Crop Physiology, UAS Dharwad, during 2015.
Pooled data of the field experiments revealed that soil application of ZnSO4 significantly increased morph-physiological, biochemical and yield of rice genotypes. Whereas foliar application of ZnSO4 significantly increased shoot and grain Zn content. Interaction effects were non-significant. Among the genotypes, Dambersali and Koorigenellu had significantly higher shoot and seed zinc content in both the field and pot experiments. The genotype Dambersali maintained significantly higher shoot Zn content in hydroponics also. Ambemohar-2, Budda, Halga and Champakali on yield basis. Whereas, Kalanamak, Kempunellu and Laldodki on drymatter basis were found Zn efficient. Significantly higher root length, root dry matter, photosynthetic rate, stomatal conductance and transpiration rates were recorded with additional and higher zinc in pot and hydroponics, respectively. Addition of Zn resulted in significantly higher enzymes activities in hydroponics. Among the genotypes Koorigenellu and Ambemohar-2 recorded significantly higher super oxide dismutase (SOD) and peroxidase (POD) activity in hydroponics. Soil application of zinc increased the grain yield in field. Among the genotypes, MTU-1001 recorded the highest grain yield of 5,175 kg ha-1 with grain Zn content of 15.8 ppm, whereas Koorigenellu recoded yield of 2,753 kg ha-1 with highest seed Zn of 28.3 ppm. Thus, there was negative relation existed between yield and seed Zn content.