Certain features of gross morphology of the cotton plant furnish clues to earliness of crop production. Node of first fruiting branch (NFB), number of monopodial branch per plant (NMB), days taken to first flower, days taken to open first boll were used a morphological measures of earliness in the studies reported here. The estimation of component of variation for these characters suggested that the additive component was significant in all the traits and were greater than dominant components of variation except for seed cotton yield per plant, where the dominant components were higher in magnitude than additive. The ratio of H2/4H1 indicated asymmetry of positive and negative genes in parents for seed cotton yield and percent first pick, whereas symmetrical distribution of positive and negative genes in the parents was observed for node of first fruiting branch, number of monopodial branches per plant, days taken to first flower and days taken to open first boll. All of these traits were significantly correlated but because of its higher heritability and lower variability, node of first fruiting branch is considered the most reliable and the most practical one of these. NFB and NMB were significantly correlated phenotypically with percent first pick (earliness). From the estimates of heritability value (broad and narrow) sense it was concluded that cross Reshmi x NIAB-78, NIAB-78 x MNH-93 and S-14 x NIAB-78 are valuable crosses for improvement of early maturing traits (node of first fruiting branch, days taken to first flower, days taken to open first boll and percent first pick) with seed cotton yield.
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Muhammad Iqbal, Muhammad Ali Chang, Abdul Jabbar, Muhammad Zafar Iqbal, Muhammad-ul-Hassan and Noor-ul-Islam, 2003. Inheritance of Earliness and other Characters in Upland Cotton. Journal of Biological Sciences, 3: 585-590.
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