1. KAUTIR (Kerala Agricultural University Theses Information and Retrieval)
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Item Incorporation of resistance to fruit cracking in a bacterial wilt resistant genetic background in tomato(Department of Olericulture, College of Horticulture, Vellanikkara, 1995) Sadhan Kumar, P G; Rajan, SAn investigation on “Incorporation of resistance to fruit cracking in a bacterial wilt resistant genetic background in tomato” was undertaken in the Department of Olericulture, College of Horticulture, Vellanikkara during the period from January, 1991 to March, 1994. The findings are succinctly mentioned below. Evaluation for bacterial wilt resistance revealed that Sakthi and LE 79 – 5 are consistently resistant to bacterial wilt. Four addition sources of bacterial wilt resistance were identified viz., LE 214, CAV – 5, LE 415 and LE 382 – 1. Resistances to bacterial wilt in these lines was governed by recessive genes. Screening for resistances to fruit cracking resulted in the identification of fifteen tomato genotypes which were found to be resistant to both radial and concentric cracking. Resistances to concentric fruit cracking in these lines were found to be dominant. All the bacterial wilt resistant genotypes had a higher content of total phenols, O.D. phenol and ascorbic acid than the susceptible line pusa Ruby. The crack resistant varieties had a higher content of insoluble solids and pectin, lower content of acidity, total sugar and reducing sugar in fruits, thick fruit skin and pericarb as compared to susceptible variety. The elasticity of skin was also higher in crack resistant genotypes. Crack resistant varieties had a compact arrangement of parenchymatous cells when compared with crack susceptible variety. The resistant lines had a thicker cuticle also. The F1 S developed by line x tester crossing were susceptible to bacterial wilt. All the same, they were resistant to both radial and concentric fruit cracking indicating dominant gene action for crack resistance. The F2 segregants with combined resistance to both bacterial wilt and fruit cracking were selected for further improvement.Item Response of cucumber genotypes to ethephon application(Department of Olericulture, College of Horticulture, Vellanikkara, 1982) Sadhan Kumar, P G; Peter, K VInvestigations were carried out during two seasons (October-January, 1981-82 and March-May, 1982) to find out the response of 20 Cucumis genotypes to four levels of ethephon (0,100, 200 and 300 ppm) at the Instructional Farm, College of Horticulture, Kerala Agricultural University, Vellanikkara. Ethephon caused significant reduction in length of main vine, nodes to first female flower, nodes to first fruit, seed number and flesh thickness. Nodes to first male flower and primary branches/plant were significantly increased. There was no significant effect of ethephon on fruit length, fruit weight and fruit volume during both the seasons. There was an increase in yield in CS 27 (326.62%) while definite reduction in yield was observed in CS 26 (42.53%), CS 43 (60.47%), CS 38 (60.79%), CS 51 (50.74%) and CS 31 (63.82%) during the first season. During second season there was no significant effect of ethephon on fruit yield. Effect of ethephon sprays on plant to alter vegetative characters is further confirmed in the present study. Despite reduction in seed number due to ethephon application, no appreciable change was observed for fruit weight, fruit volume and fruit length. This is a matter for worth investigation. Reduction is vine length and increase in primary branches could be attributed to effects of ethephon to effect the phenomenon of apical dominance. The study proved that response of Cucumis genotypes to ethephon is governed by genotype, season of cultivation and concentration of ethephon used.