Agricultural Research Corporation (ARC) - Sudan
Proceedings of the Meetings of the National Crop Husbandry Committee - NCHC
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Natural Outcrossing and Distance of Isolation in Cotton (G. hirsutum)
under Gezira Conditions
Abdelbagi M. Ali , Wisal H. Mekki , Abu Alhassan Ibrahim, Kamal
El-Siddig and Elfadil A. Babiker
Abstract:
The extent of the natural crossing in cotton ( Gossypium hirsutum L.)
was studied in two experiments conducted at the Gezira Research Farm
during 2001-2003 using an okra leaf-shape as a genetical marker.
Varieties Sudac- k (okra leaf- shape) and Barac (67)B (normal
leaf-shape) were used as a marker and test variety, respectively. In
both experiments, the marker variety, Sudac-K was sown in form of a
block of 10 m2 in the middle, while the test variety, Barac (67)B was
sown in form of a block and strips in the first and second experiments,
respectively. The effects of six distances from the marker variety, four
directions and three positions of bolls on the plant, on
cross-pollination were investigated. The main effects of the three
factors on cross-pollination were significant. The ranges of outcrossing
throughout the treatmeants were 0 - 1.33% and 0 - 3.32% for the first
and second experiments, respectively. Natural crossing percentages were
higher when the test variety was sown in strips than when sown in full
blocks. In both experiments, the mean percentage of natural crossing
reached zero value at the distance of 15 m from the marker across
directions with the exception of the East where it reached zero value at
30 m. Bolls harvested from the lowest part of the plant gave the highest
mean percentages of outcrossing. It is quite evident from the current
study that distances greater than 30 m can effectively prevent natural
crossing and preserve cultivar purity.
Proceedings of the Meetings of the National Crop Husbandry Committee 39th (2005) pp. 147-155
Proceedings of the Meetings of the National Crop Husbandry Committee - Sudan
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