GENOTYPIC VARIATION FOR DROUGHT TOLERANCE TRAITS IN MANGO (Mangifera indica L.)
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Date
2019-08
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University of Horticultural Sciences, Bagalkot. (College of Horticulture, Bengaluru).
Abstract
The study on “Genotypic variation for drought tolerance traits in mango varieties” carried out at Fruit research block, Regional Horticultural Research and Extension Centre, UHS campus, Bengaluru. Wherein, 23 varieties were used for the study. ANOVA for all the morphophysiological, biochemical and yield traits studied and revealed significant variation among the varieties in both kharif and rabi season of 2018. Morphophysiological traits like canopy width (6.00 m2 in Totapuri), stem diameter (66.14 cm in Cheruku Rasam), moisture retention capacity (97.31 %Kottapalli Kobbari), Stomatal frequency (103.40 number/ mm2 in Baramasi), relative water content (92.87 % in Neelam) and specific leaf area (94.77 cm2/g in Totapuri), biochemical traits like epicuticular wax content (1.30 mg / cm2 in Alphonso), chlorophyll content (68.03 SPAD Value in Baramasi),free proline (2.56 µmol/g in Ratna) and sugars (%), yield traits liketotal number of fruits per plant (237.44 in CherukuRasam) and fruit weight (94.96 kg/plant in Cheruku Rasam)differed significantly for all the varieties.Correlation studies revealed highly significant and positive association of stem diameter (0.638), specific leaf area (0.536) and total sugars (0.677) with total number of fruits and fruit weight. Selection based on these traits can be effective for developing drought tolerant varieties. Among 23 varieties Poona Sahana and Suvarna Rekha performed better with drought traits and varieties CherukuRasam, Dasheri, Javari, Totapari, Faradin and Alphonso performed better with respect to both drought related and yield traits. Hence these varieties could be used in further breeding programme.