EVALUATION OF CAULIFLOWER (Brassica oleracea L. var. botrytis) GENOTYPES AND DETERMINATION OF SELECTION PARAMETERS FOR ITS GENETIC IMPROVEMENT
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Date
2020-07-13
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CSKHPKV. Palampur
Abstract
The present investigation was planned to study the genetic variability, association among
yield and component traits and their direct and indirect effects for effective selection, and to
study the extent of genetic diversity. The experimental material comprising of 26 genotypes
belonging to mid late and late group was evaluated in randomized complete block design with
three replications for two consecutive years during winter season of 2018-19 and 2019-20.
Data were recorded on marketable curd weight and its 18 related traits. Sufficient genetic
variability was observed for yield and component traits. The evaluation of mean performance
revealed that DPCa CMS 1 showed advantage of 27% for marketable curd weight over
standard check Palam Uphar followed by DPCaf W3, DPCaf US and DPCaf 30 which was
mainly due to significant contribution of curd depth, curd diameter, leaf length, leaf width,
optimum plant frame, curd compactness/solidity, gross and net plant weight. Moderate PCV
and GCV were reported for days to curd initiation, curd solidity, gross plant weight, net curd
weight and marketable curd weight irrespective of years and pooled over years whereas plant
characteristics in general showed low PCV and GCV indicating minimal differences among
these genotypes. High heritability coupled with high genetic advance was observed for gross
plant weight, net curd weight and marketable curd weight over the years in addition to curd
solidity and days to curd initiation in either of the years. Correlation and path analysis
indicated that gross plant weight, harvest index, curd size index, curd solidity, curd depth and
net curd weight could be a paying preposition and beneficial for evolving high yielding
genotypes. The multivariate analysis revealed considerable genetic diversity among genotypes
and these were arranged into three, six and seven clusters during 2018-19, 2019-20 and in
pooled years, respectively with maximum genotypes in cluster I. Days to curd initiation,
leaves/plant, curd solidity and gross plant weight during both the years had maximum
contribution towards the genetic divergence. Based on genetic divergence studies, genotypes
namely, DPCaf W3, DPCaf US, DPCa CMS 1, DPCa CMS 2, DPCaf 1, DPCa CMS 3,
DPCaf 30, DPCaf 13 and DPCaf S5-1 offer promise as breeding lines or potential parents to
be used in breeding programmes to get desirable transgressive segregants. Visual observations
showed that majority of the genotypes had Type No.3 plants with semi-incurving/incurving
leaves and white to snow white curds with no riceyness.