HETEROSIS AND COMBINING ABILITY STUDIES USING CYTOPLASMIC MALE STERILITY IN CAULIFLOWER (Brassica oleracea L. var. botrytis L.)

Simple item page
dc.contributor.advisorMEHTA, DEVINDER KUMAR
dc.contributor.authorNAIR SUNIL APPUKUTAN, NAIR SUNIL
dc.date.accessioned2021-03-30T07:13:21Z
dc.date.available2021-03-30T07:13:21Z
dc.date.issued2021-03
dc.description.abstractABSTRACT The present investigation entitled “and Combining Ability Studies Using Cytoplasmic Male Sterility in Cauliflower (Brassica oleracea L. var. botrytis L.)”was conducted during the years 2018-2020 at research farm of Department of Vegetable Science, Dr YS Parmar University of Horticulture and Forestry, Nauni, Solan (HP) to assess the information on gene action as inferred from the combining ability analysis and magnitude of heterosis for different yield related traits. Thirty cross combinations generated from crossing of three CMS lines (UHF-CAU-CMS-1, UHF-CAU-CMS-2, UHF-CAU-CMS-3) with 10 testers (PSBK-1, PSBKT-25, Early Snowball, Cambridge No. 5, Olympus, Snowball Super, White Heart, Champion, Early London, White Rock) in Line × Tester mating design were evaluated along with parents and a check (Pusa Snowball Hybrid-1) in randomized complete block design (RCBD) with three replication. The genotypes and crosses were evaluated for various quantitative traits viz., plant height, days to 50 per cent curd harvesting, number of leaves per plant, leaf length, leaf breadth, plant spread, stalk length, curd equatorial length, curd polar length, curd size index, curd solidity, gross plant weight, marketable curd weight, marketable curd yield, net curd weight, , harvest index and disease parameters such as Sclerotinia rot incidence and black rot severity. The quality traits such as leaf attitude, leaf shape, leaf colour, leaf waxiness, curd covering by inner leaves, curd knobbing, curd texture, curd shape, curd doming, curd colour, curd riceyness and curd anthocyanin at the time of maturity were also recorded on basis of DUS characterization. Analysis of variance for the data revealed significant differences among the genotypes for most of the traits investigated. The combining ability analysis revealed significant differences due to lines, testers and line x tester interactions for most of the traits when tested against error indicating appreciable diversity in the experimental material. The experimental results revealed UHF-CAU-CMS-1 as the best general combiner for various traits such as plant height, leaf length, plant spread, curd polar length, curd size index, gross plant weight, marketable curd weight, while; UHF-CAU-CMS-2 excelled with desirable GCA effects for traits viz., days to 50 per cent curd harvesting, leaf breadth, curd equatorial length, curd solidity and net curd weight. The experimental results inferred that on the basis of GCA analysis and mean performances, the parents, UHF-CAU-CMS-2 (Line) and PSBK-1, Early London and Snowball Super (testers) were found superior for majority of yield contributing traits. The cross combinations UHF-CAU-CMS-1 × Snowball Super, UHF-CAU-CMS-1 × PSBK-1 and UHF-CAU-CMS-2 × Early London were the three best performing crosses on the basis of their per se mean performance, SCA analysis and heterotic effects for majority of yield traits such as curd size index, marketable curd weight/curd yield, net curd weight and its contributing traits. These crosses also exhibited less Sclerotinia rot incidence and black rot severity and had desirable curd traits such as snow-white curds, curd covering by inner leaves, compact curds and were free from curd riceyness. The estimates of variance ratio (σ2A/ σ2D) were less than unity for most of the traits substantiating the role of non-additive gene action for the traits suggesting the exploitation of heterosis breeding for further improvement in the mid-late and late maturity groups of cauliflower. Hence, these three cross combinations should be further evaluated at multi-locations before releasing as a substitute of already existing hybrids of cauliflower.en_US
dc.identifier.urihttps://krishikosh.egranth.ac.in/handle/1/5810163251
dc.keywordshybrids,cauliflower.Heterosis ,Cytoplasmicen_US
dc.language.isoEnglishen_US
dc.pages130+iiien_US
dc.publisherUHF,NAUNIen_US
dc.subVegetable Scienceen_US
dc.themehybrids,cauliflower.Heterosis ,Cytoplasmicen_US
dc.these.typePh.Den_US
dc.titleHETEROSIS AND COMBINING ABILITY STUDIES USING CYTOPLASMIC MALE STERILITY IN CAULIFLOWER (Brassica oleracea L. var. botrytis L.)en_US
dc.typeThesisen_US
Files
Original bundle
Now showing 1 - 1 of 1
No Thumbnail Available
Name:
PDF Ph. D. Thesis Nair Sunil Appukutan (VGC).pdf
Size:
4.52 MB
Format:
Adobe Portable Document Format
Description:
VEGETABLE SCIENCE
Download
License bundle
Now showing 1 - 1 of 1
No Thumbnail Available
Name:
license.txt
Size:
1.71 KB
Format:
Item-specific license agreed upon to submission
Description:
Download
Collections
Theses