Assessment of Genetic Variability in F4 Populations of Upland Cotton (Gossypium hirsutum L.)

Abstract

P akistan is the 4 th largest cotton producing and 3 rd cotton consuming country, however, the yield is low as compared other cotton producing countries (Nazir et al., 2020). The main reason of low yielding potential of existing germplasm is influence of biotic and abiotic factors and cotton production can be manage by introduction of new cotton varieties. Pakistan is leading in exporting cotton yarn and third in the export of raw material of the cotton crop worldwide (Nizamani et al., 2017). The nation of Pakistan largely depends on cotton industries with relation to textile sector. This fiber crop is on the top Abstract | The current investigations were carried out during 2016-2017 to determine genetic variability, heritability, and genetic gain in nine F 4 segregating populations for morphological, yield and fiber quality related traits in upland cotton. Significant differences were observed among genotypes, parents, F 4 populations and parents x F 4 populations for all the studied attributes which articulated greater genetic variation in the breeding material. Heritability estimates were moderate to high for all the traits. The F 4 population CRIS-134 x FH-113 displayed the highest heritability estimates for plant height (95.24%). The maximum heritability for sympodial branches plant -1 (85.30%) and seed index (82.02%) were exhibited by the F 4 population CRIS-342 x IR-3701. The F 4 population CRIS-342 x Neelum-121 manifested the highest heritability values for bolls plant -1 (90.81%) and boll weight (96.85%). For seed cotton yield plant -1 and ginning outturn, the highest heritability values (90.08 and 90.20%) were confirmed by the F 4 population CRIS-342 x MNH-886. For staple length, the promising heritability was discovered in the F 4 population CRIS-134 x Neelum-121 (85.45%). Genetic gain values were low to high for all traits. Results suggested that above F 4 populations indicated their potential for various yield and fiber traits through heritability coupled with genetic gain to be used in future breeding programs for improving seed cotton yield and fiber quality traits in upland cotton.

Genetic variability studies for yield components and fibre quality traits in upland cotton (Gossypium hirsutum L.)

“…Ginning out turn was found maximum in the parent MCU 5 (39.72%) and the cross CO 14 x GISV 328 (39.34%). This result was supported by Ahsan et al (2015), Khokhar et al (2017), Baloch et al (2018), Abro et al (2021) and Muhammed et al (2016) for seed cotton yield.…”

“…This indicates that heritability is due to additive gene action and hence direct selection will be profitable in these traits. Previous studies bySahar et al (2021),Abro et al (2021),Nandhini et al (2019), Nikhil et al (2018 andShao et al (2016) documented similar results. Higher heritability with medium genetic advance was found for days to 50 per cent flowering (66.77 %, 10.85 %), plant height (80.90 %, 15.97 %), seed index (72.67 %, 12.53 %) and fibre strength (83.20 %, 13.36 %).…”

Genetic variability and heritability estimates in F2 populations of intra hirsutum for various traits

“…Batool et al, ( 2010) reported similar ndings for days to rst owering. Plant height is important symbol which permits the yield plant to resist clearly with weeds and other purposes such as proper distribution of photosynthesis CRIS-508 x CRIS-510 was reported with taller plants, while variety CRIS-508 reported taller Plant among the parental lines Abro et al (2021) reported almost similar ndings for plant height in F4 combinations and their parents. Sympodial branches were noted in maximum number in F2 hybrid Bakhtawar x Koonj whereas genotype CRIS-510 was remained on the top among the parents.…”

“…Farooq et al (2018) and Saleem et al (2020) carried out research in various cotton genotypes for estimating genetic and inheritance of quantitative characters utilizing numerous segregating progenies in which they indicated that the segregating progenies provided more genetic perception into polygenic parameters such as bolls per plant, boll size and boll weight. Abro et al (2021) reported moderate to high heritability with low genetic gain for boll weight in F4 populations of upland cotton. In case of seed cotton yield moderate to high heritability observed with low to high genetic progression.…”