GENETIC ANALYSIS AND ECONOMIC USAGE OF COMPOUND INFLORESCENCE IN TOMATO
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Date
1997
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UNIVERSITY OF AGRICULTURAL SCIENCES, DHARWAD
Abstract
Four experiments were undertaken in tomato during the year 1995-97 on characterization of compound inflorescence genotypes, inheritance of compound inflorescence (Cl), heterosis and combining ability, isolation of segregants suited to fresh market or processing, at the College of Agriculture, Dharwad. Studies on characterization revealed that CI of all the five genotypes had the basic structure of compound dichasium while, simple inflorescence (SI) genotypes had unbranched monochasium. Further, two CI phenotypes were observed for F owering habits: terminal flowering and non- terminal flowering. Characterization of compound inflorescence vs. simple inflorescence indicated higher flower number in CI genotypes. Higher flower number (166) in CC-NT was associated with non-terminal flowering habit. Inheritance of basic structure of inflorescence was controlled by recessive epistasis (9:3:4 ratio of unbranched monochasium: compound monochasium: compound dichasium) , type of inflorescence by monogene (3: 1 ratio of SI:CI) and flowering habit also by monogene (3: 1 ratio of terminal flowering : non-terminal flowering). Additive variance was higher than dominance variance for seventeen of the nineteen characters indicating preponderance of additivity in these cases. For number of fruits per plant and number of fruits per truss dominance variance was higher than additive variance thus evidencing the dominant role of non additively. Out of 28 hybrids, there were two significantly positive heterotic hybrids namely SP 28-2-2 X CC-SF and SP 28-2-2 X CC-BF over mid parent/ best parent and three L-15 X SP 28-2 2, SP 28-2-2 X CC-SF and SP 28-2-2 X CC-BF over commercial check-Punjab Chhuhara, worth of commercial exploiltation. When subjected F2 population for selection to processing requirements L-15 X CC-OF/96/13-8 and L-15 X SP 28-2-2(96/14-7) were found worth while for commercial exploitation (need to be developed into pure lines). But these require manual harvesting. However, suitability to mechanical harvesting and having desirable processing traits point out to SP 28-2-2 X CC-BF/96/21/5 as a best segregant. Alternatively, suitability to fresh market indicated CC-SF X CC-BF/96/3-8 as a best segregant worth of commercial exploitation.
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