EFFICIENCY OF BIPARENTAL AND F₃ IN BREAKING OF LINKAGE GROUPS AND CREATING NEW GENETIC COMBINATIONS EGYPTIAN IN COTTON

M.A. ABDEL-MONAEM¹*, M.H. GHONEIMA², Y.M. EL-MANSY³, M.W.O. EL-SHAZLY^4
1Agronomy Department, Faculty of Agriculture, Mansoura University, Egypt.
²Agronomy Department, Faculty of Agriculture, Mansoura University, Egypt.
³Cotton Research Institute, Agriculture Research Center, Egypt.
⁴Cotton Research Institute, Agriculture Research Center, Egypt.
* Corresponding Author : maaelmoneam@mans.edu.eg

Received : 07-05-2015     Accepted : 06-06-2015     Published : 02-07-2015
Volume : 7     Issue : 3       Pages : 465 - 469
Int J Agr Sci 7.3 (2015):465-469

Keywords : Cotton, Biparental mating, PCV, GCV, h²_(b), h²_(n), Genetic variance
Academic Editor : Kant Kamal, Xianliang Song
Conflict of Interest : None declared

The study was done in the Agron. Dept., Fac. of Agric., Mansoura University. The investigation was carried out at Sakha Agricultural Research Station, Kafr EL-Sheikh, Agric. Res. Center, Egypt, during 2010 and 2011 growing seasons. Astudy was undertaken in cotton (G. barbadense L.) to assess the relative efficiency of biparental mating and F3 selfed populations in realizing greater variability with desirable recombinants using F2 of one cross Giza 86 x Pima S6. These F2 populations were advanced to F3 following intermating (biparental mating BIP and selfing). Analysis of variance revealed highly significant differences among biparental sets of families for all studied characters. The variation between plants in biparental progenies were relatively high as compared with F3 selfed families. Biparental progenies proved its superiority over selfing by registering high mean values in desirable direction for most characters. Considerable variation was observed in biparental progenies as compared to F3 selfed populations for most of the characters, which confirmed by high means of GCV and PCV values. Also, variations created on account of biparental mating were found to be heritable as seen from increases of discrepancy between PCV and GCV and reflected less influence of environmental factors. The contribution of additive variance was higher for most earliness traits, lint percentage, lint index and uniformity ratio in both BIP and F3 selfed populations. The magnitude of non- additive were largely in BIP for most yield characters and fiber fineness and strength in both crosses as compared with F3 selfed. Broad sense heritability improved considerably for most characters in BIP. This was due to increased portion of genetic variance to total phenotypic variance due to cryptic genetic change that have been brought about one cycle of intermating.