الفهرس 
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Abstract
Cotton is a major fiber crop grown throughout tropical and sub-tropical
regions of the world. It also plays a principal role in the economy of a large
number of developing as well as developed countries. Among the cotton growing
countries, India ranks first in area (9.16 m.ha) and produces about 17.15 m bales
of cotton Potdar I!I aL• 1999, from this 9.16 m.ha area 40% is hybrid cotton.
The total hybrid seed requirement in India is 9000 tons annually Basu 1999;
The commercial exploitation of the phenomenon of heterosis is one of the
most important contributions from cotton breeding in this century. Heterosis is
fundamentally dependent on the genetic effect of dominance ,Falconer 1960,
• As a consequence, maximizing genetic diversity between inbreeds is a major
goal in hybrid breeding programs in order to maximize heterozygosity in the
progeny.
Evaluation of hybrids for heterosis or combining ability in the field is
expensive and time consuming. Though, many studies had been carried out
attempting to predict heterosis and combining ability via biochemical genetic
markers in a number of field crops to save time and field testing efforts.
The use of molecular markers to identify quantitative trait loci affecting
agriculturally important traits has become a key approach in plant genetics, both
fur understanding the genetic basis of these traits and to design novel plant
improvement programs.
The main purpose of this study was performed to determine the amount of
heterosis and combining ability for the important economic traits of cotton in
intraspecific crosses of G. barbadel1se, L. In addition, to detect the possibility of
predicting heterosis and combining ability in this crosses via biochemical
analysis.