Abstract
Gossypium hirsutum L. is also called upland cotton or Mexican cotton. It is the most widely cultivated species of cotton in the whole world. Globally, about 90% of all cotton production comes from the cultivars derived from this species. Some genetic parameters like monopodial branches per plant, sympodial branches per plant, sympodial branch length, bolls per plant, boll weight, sympo-boll distance, Ginning Out Turn%, staple length (rg = 0.9199**), and fiber strength along with seed cotton yield were evaluated for their potential utilization via selection in seed cotton yield improvement. Significant positive genetic correlations were estimated for monopodial branches per plant (rg = 0.9722**), sympodial branches per plant (rg = 0.7098**), sympodial branch length (rg = 0.617**), bolls per plant (rg = 0.8271**), boll weight (rg = 0.8065**), sympo-boll distance (rg = 0.6507**), Ginning Out Turn (GOT)% (rg = 0.7541**), staple length (rg = 0.9199**), and fiber strength (rg = 0.7534**) with seed cotton yield. A path analysis of all the yield traits under study revealed strong positive direct effects of monopodial branch length (1.1556), sympo-boll distance (0.8173) and staple length (0.7633), while plant height exerted a highly strong direct negative effect (-1.2096) on yield. It is concluded that a direct selection based on monopodial branch length and sympo-boll distance, and staple length is effective, whereas, monopodial branch length, and sympodial branch length are good selection indicators via bolls per plant for yield improvement in cotton.
Highlights
Gossypium hirsutum L. known as upland cotton [1] or Mexican cotton, is the most widely cultivated species of cotton in the world
On harvesting of mature crop data were recorded in each entry for 25 randomly selected plants on crop maturity for recording of data and agronomic data for monopodial branches per plant (MBP), monopodial branch length (MBL), sympodial branches per plant (SBP), sympodial branch length (SBL), sympo-boll distance, (SBD), bolls per plant (BP) Plant height and 50 Boll weight
Lint samples were subjected to further fiber traits like staple length (SL), fiber strength, (FS) and fiber fineness (FF) micronaire by using spinlab 1 HVI-900 at Cotton Research Station (CRS) Multan, Pakistan
Summary
Gossypium hirsutum L. known as upland cotton [1] or Mexican cotton, is the most widely cultivated species of cotton in the world. Most commonly short staple cotton is the characteristic of upland cotton To overcome this scientist are working to get extra-long stapple in upland cotton [2]. Scientist are working on genetic variations in upland cotton to overcome different issues and challenges like salt tolerance [4], fiber traits [5], resistance against bacterial blight [6] and insect resistance [7]. A part from adoption of water saving techniques like drip irrigation and use of sprinkler systems to cultivate cotton [9] new varieties of upland cotton should be developed through breeding and genetic modification which are drought tolerant. Seed cotton yield is polygenic and highly intricate trait for improvement is under collaborative impact of various quantitative characters association a path coefficient analysis helps to measure and engrave the direct and indirect effects of various component traits for decisive evaluation of yield component contribution to economic yield [13, 17, 18]
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