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Heterosis studies of yield and fiber quality traits in (Gossypium hirsutum L.)


The International Journal of Biological Research (TIJOBR)

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Nabi Ahmad1, Rao Saad Rehman1, Mujahid Ali1*, Abdul Arham1, Ahsan Zaka1, Yousuf Shafiq1, M. Junaid Zaghum1, Ali Raza2, Naurez Hasnain1 
*Corresponding author: mujahid.ali2k18@outlook.com 
Submitted Accepted Published
Sep 09,2018 Jan 18,2019 Feb 05,2019

2019 / Vol: 2 / Issue: 1


Abstract


Heterosis exploitation is one of the effective techniques for improvement of cotton yields. In the present study 4 lines crossed with 4 testers in the line × tester mating fashion to study the heterosis of different traits of cotton. The parents along with their 16 hybrids were evaluated in RCBD in three replications in the field during 2017-2018. For plant height FH-2015 × FH-114 showed negative and highly significant value for mid parent (-14.34) & (-15.38) for better parent heterosis. For number of monopodial branches MNH-998 × IUB-65 showed positive and highly significant value (157.14) for mid parent heterosis and (125.00) for better parent heterosis. For number of bolls FH-312 × IUB-65 showed positive and highly significant value (31.62) for mid parent heterosis and showed non-significant value for better parent heterosis. For boll weight FH-2015 × FH-114 showed positive and highly significant value (39.46) for mid parent heterosis and also showed highly significant value (30.52) for better parent heterosis. For ginning out turn the FH-2015 × IUB-65 have positive and highly significant value (14.16) for mid parent heterosis while it also showed positive and highly significant value (14.03) for better parent heterosis. For lint index CRS-2007 × IUB-65 showed positive and highly significant value (18.46) for mid parent heterosis and it also showed positive and highly significant value (16.19) for better parent heterosis. For number of seeds per boll FH-2015 × MS-71 showed positive and highly significant value (18.37) for mid parent heterosis and it also showed positive and highly significant value (16.15) for better parent heterosis. For fiber length FH-2015 × MS-71 showed positive and highly significant value (14.92) for mid parent heterosis while it also showed positive and highly significant value (14.10) for better parent heterosis. For fiber strength CRS-2007 × NS-131 showed positive and highly significant value (6.47) for mid parent heterosis it also showed positive and highly significant value (4.31) for better parent heterosis. For fiber fineness the hybrid of CRS-2007 × FH-114 showed negative and highly significant value (-13.20) for mid parent heterosis it also showed positive and highly significant value (-14.22) for better parent heterosis. Among crosses CRS-2007 × NS-131, MNH-998 × IUB-65, FH-2015 × MS-71, CRS-2007 × FH114, FH-2015 × FH-114 were proved to be best specific combiners for most of the characters. Whereas FH-2015 × FH114, MNH-998 × FH-114, MNH-998 × MS-71, CRS-2007 × MS-71 had significant mid and better parent heterosis for most of the traits under study. So these cross combinations may be used in the development of hybrid cotton or in the improvement of different cotton traits.
Key words: heterosis breeding, fiber quality, line × tester analysis 


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