PHYSIOLOGICAL AND GENETICAL INVESTIGATION FOR DROUGHT TOLERANCE IN TOMATO (Solanum lycopersicum L.) GENOTYPES
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Date
2016-11
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K.R.C. COLLEGE OF HORTICULTURE, ARABHAVI (UNIVERSITY OF HORTICULTURAL SCIENCES, BAGALKOT)
Abstract
Drought tolerance studies in tomato genotypes were undertaken at K.R.C. College of Horticulture Arabhavi during 2014-2016. Initially, 50 tomato genotypes were screened for drought tolerance based on the per cent reduction in 0.4 over 1.2 IW/CPE for physiological, biophysical, biochemical and morphological characters. Based on first experimental results 13 genotypes consisting of eight tolerant four susceptible and one local check were selected for detailed investigation under stress with above traits in addition to some parameters during second experiment.
Results of selected genotypes analysis indicated that under the sever moisture of 0.4 IW/CPE ratio, higher yield was noticed in the genotype EC 631962 as compared to susceptible genotype EC 608269. Biomass production was significantly higher in the genotypes EC 638519, EC610661 and Kashi Anupam at all growth stages as compared to local check Arka Meghali and susceptible genotypes. Among the biophysical parameters genotype EC 610661 had maximum transpiration rate, whereas in Arka Meghali had significantly higher photosynthesis. Among biochemical traits, chlorophyll ‘a’, ‘b’ and TSS content was maximum in the genotype EC 638519 whereas, ascorbic acid content were higher in the genotype PUSA 120. Lycopene content was more in the genotype EC 610661 while proline was higher in EC 610652. Number of pubescence count on adaxial and abaxial surface was significantly higher in EC 634394.
Path coefficient analysis revealed that relative growth rate and total chlorophyll had positive direct effect on yield at genotypic level. SSR profile analysis of 13 tomato genotypes by using six primers, only three primers had shows polymorphism. The dendrogram was revealed that the thirteen genotypes examined and all genotypes were grouped into three major clusters.
Hence, considering morphological, biophysical, biochemical, yield and quality parameters it can be inferred that genotypes EC 608362, EC 610652, EC 634394, EC 638519, EC 610661, EC 631962, Kashi Anupam and Pusa 120 performed better under drought conditions and could be categorised as drought tolerance genotypes compared to EC 696550, EC 686543, EC 608269 and EC 686553. These tolerant genotypes can be used for further breeding programme.
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TH581
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