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| Articles
by
Muhammad Ali Chang |
Total Records (
2 ) for
Muhammad Ali Chang |
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Muhammad Iqbal
,
Muhammad Ali Chang
,
Abdul Jabbar
,
Muhammad Zafar Iqbal
,
Muhammad-ul-Hassan
and
Noor-ul-Islam
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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 Zaffar Iqbal
,
Muhammad Ali Chang
and
Khezir Hayat
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Exploiting heterosis is one method to increase cotton yield that has stagnated in recent years. One primarily to difficulty of producing F1 seed, use of heterosis in cotton (Gossypium hirsutum L.) has been limited. The objective of this study was to evaluate the potential of using F2 hybrids by comparing them with parents, commercial variety and F1,S for yield, yield components and fiber quality. The second objective of this study was to determine if parental research organization of origin was related to mid parent and useful heterosis. The genetic design was a half diallel consisting of six parent (evolved by different research organization), 15 F1,s and 15 F2,s. The 36 genotypes were grown in 2002-2003. Yield, yield components fiber length, strength and micronaire reading were determined. The highest yielding parent was FH-901 (3517 kg ha-1) with good yield components (recommended commercial variety for general cultivation), while the variety Reshmi had best quality traits among these parents. The cross combinations MNH439 X CIM-448, FH-901 X CIM-448 and NIAB-78 xX CIM-448 showed minimum inbreeding depression (-34.6, -20.0 and
-21.8%, respectively) for seed cotton yield. These crosses also showed less inbreeding depression for yield components and fiber traits than expected inbreeding depression i.e 50.0%. General combining ability mean squares were significant for all traits and specific combining ability mean squares were also significant for all traits except boll weight and fiber strength. The GCA effects were higher than SCA effects for all traits, which indicated that additive gene action is prevailing with dominant for expression of these traits. The variety CIM448 was the best general combiner for the yield and yield components. |
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