MOLECULAR DIVERSITY ANALYSIS IN ELITE TOMATO GENOTYPES SELECTED FOR FRUIT QUALITY TRAITS
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Date
2015-10-26
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UNIVERSITY OF AGRICULTURAL SCIENCES GKVK, BENGALURU
Abstract
Tomato (Solanum lycopersicum L.) is an important source of several
minerals and vitamins. Exhibits wide degree of variability with respect to growth
habit, fruit size, fruit shape, fruit color and yield per plant etc., Twenty exotic and
indigenous accessions of tomato were screened for variability in terms of
morphological, biochemical and molecular diversity. Fifteen were indeterminate
type and five were determinate type. The accessions with best morphological
characters identified were viz., EC-620545 (higher fruit weight-162.00 g and high
fruit yield-8.24 kg/plant), EC-16786 (higher fruits/cluster-8), EC-159053(high
lycopene content-10.12 mg/100g), EC-168283 (high ascorbic acid content-18.07
mg/100g) and EC-151568 (high TSS-8.08 0Brix). High GCV(21.18 to 40.32)and
PCV(25.44 to 41.08) values were recorded for plant height, fruit firmness, total
solids, TSS, fruit length, fruit width, fruit weight, number of clusters per plant,
number of fruits per cluster and yield. Very high GCV and PCV values were
recorded for lycopene content (71.00; 71.23) and ascorbic acid content (59.10;
59.31).The heritability estimate were very high for plant height, number of days
from flowering to fruit set, fruit pH, fruit firmness, total solids, lycopene content,
TSS, ascorbic acid, fruit length, fruit width, fruit weight, number of clusters per
plant, number of fruits per cluster and yield per plant. The molecular diversity was
assessed using thirty SSR markers, out of which fifteen were polymorphic and
shown highest similarity matrix between EC-165690, EC-168283, EC-249514,
EC- EC-249515, EC-320574-1, EC-362944 and EC-151568. Hence these markers
can be used to measure the genetic relation between the accessions during crop
improvement.
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