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University of Agricultural Sciences, Bengaluru

University of Agricultural Sciences Bangalore, a premier institution of agricultural education and research in the country, began as a small agricultural research farm in 1899 on 30 acres of land donated by Her Excellency Maharani Kempa Nanjammanni Vani Vilasa Sannidhiyavaru, the Regent of Mysore and appointed Dr. Lehmann, German Scientist to initiate research on soil crop response with a Laboratory in the Directorate of Agriculture. Later under the initiative of the Dewan of Mysore Sir M. Vishweshwaraiah, the Mysore Agriculture Residential School was established in 1913 at Hebbal which offered Licentiate in Agriculture and later offered a diploma programme in agriculture during 1920. The School was upgraded to Agriculture Collegein 1946 which offered four year degree programs in Agriculture. The Government of Mysore headed by Sri. S. Nijalingappa, the then Chief Minister, established the University of Agricultural Sciences on the pattern of Land Grant College system of USA and the University of Agricultural Sciences Act No. 22 was passed in Legislative Assembly in 1963. Dr. Zakir Hussain, the Vice President of India inaugurated the University on 21st August 1964.

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Subject: Crop Physiology × Author: AFSANABANU, MANIK × Start date: 2012 ×
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    ThesisItemOpen Access
    ASSESSMENT OF MESOPHYLL CONDUCTANCE AND CARBOXYLATION EFFICIENCY IN DETERMINING WUE IN FINGER MILLET AND RICE
    (UNIVERSITY OF AGRICULTURAL SCIENCES GKVK, BENGALURU, 2017-08-14) AFSANABANU, MANIK; Sheshshayee, M.S
    Photosynthesis is predominantly a diffusive process. Diffusion of CO2 from atmosphere to the carboxylation site in the chloroplast is controlled mainly by the conductances through stomata (gs) and mesophyll tissue (gm). It is hypothesised that interdependence of stomatal and mesophyll conductances for CO2 and H2O would subsequently modulate WUE in crop plants. Further mesophyll thickness and/or carboxylation efficiency (CE) are expected to bring in differences in gm. To understand the role of leaf thickness in CO2 transfer and hence photosynthetic efficiency, a study was undertaken using 14 rice and 9 ragi genotypes differing in SLW. We analysed differences in gas exchange, CE and gm, among the three rice and three ragi genotypes which showed significant and consistent variation. The soil moisture content of these lines was maintained by gravimetric approach and several growth parameters were recorded. Ragi showed lesser gm despite higher SLW as compared to rice, which had higher gm with thinner leaves. The WUE of ragi was significantly higher than that of rice. The higher CE due to CO2 concentrating mechanism in ragi may have driven CO2 diffusion, hence in C4 crops variation in leaf thickness has less relevance. However in rice increase in SLW decreased gm. The result of this investigation indicated that carboxylation efficiency determines the CO2 diffusion and genotypes with higher carboxylation efficiency would maintain higher WUE without substantially reducing photosynthesis and biomass accumulation.