Natural cross pollination in Egyptian cotton (Gossypium barbadense L.)

1976 ◽  
Vol 86 (1) ◽  
pp. 205-209 ◽  
Author(s):  
M. A. Elfawal ◽  
M. A. Bishr ◽  
E. K. Hassoub
Keyword(s):  
Gossypium Barbadense ◽  
Cotton Variety ◽  
Cross Pollination ◽  
Growing Seasons ◽  
Natural Crossing ◽  
Egyptian Cotton ◽  
Natural Cross

SUMMARYThe percentage of natural cross pollination was estimated in the Alexandria area (Egypt) in two sites near and far from an apiary. The Egyptian cotton variety Giza 45 and the glandless strain Bahtim 110, as a marker parent, were used during three growing seasons. The average natural crossing within the square of the marker parent were 3·54 and 0·34% near and far from the apiary respectively. For the plants around the square of pollen source, however, the average of natural crossing was 0·56% near the apiary, while it was 0·21% far from the apiary. The natural crossing steadily decreased as the distance from the marker variety increased.

Effect of Direction and Distance on Cross Pollination in Egyptian Cotton (Gossypium barbadense L.)

1972 ◽  
Vol 8 (1) ◽  
pp. 67-71 ◽  
Author(s):  
Hassan E. Galal ◽  
H. A. Abou-El-Fittouh ◽  
Gadd Morshed
Keyword(s):  
Linear Relation ◽  
Gossypium Barbadense ◽  
Cotton Breeding ◽  
Cross Pollination ◽  
Breeding Methodology ◽  
Egyptian Cotton ◽  
Cross Fertilization

SUMMARYThe effect on cross pollination of four directions and six distances from the marker variety in Egyptian cotton was investigated. The percentage of cross pollination did not differ appreciably in the different directions but there were significant differences in cross fertilization among the six distances. A linear relation was observed between cross pollination per cent and distance up to 8.8 m. from the marker variety. Implications of these findings on various aspects of cotton breeding methodology are discussed.

scholarly journals Studies On Natural Cross-Pollination In Pigeonpeas (Cajanus cajan)

1969 ◽  
Vol 51 (1) ◽  
pp. 1-3
Author(s):  
Raul Abrams
Keyword(s):  
Seed Production ◽  
Cajanus Cajan ◽  
Cross Pollination ◽  
Natural Hybrids ◽  
New Varieties ◽  
Natural Crossing ◽  
Natural Cross

Results obtained in a study of natural crossing among strains of pigeonpea grown in adjacent rows show that cross-pollination ranges from 5.47 to 6.33 with an average of 5.80 percent in a population of 5,328 plants. Progenies from plants artificially selfed with nylon bags produced no natural hybrids. The results obtained in this study indicate that, for the maintenance of pure varieties or stocks, and the seed production of new varieties, they should be grown under isolation, or with the flowerbuds covered with finely woven nylon bags, in order to prevent contamination.

Effect of foliar application of chelated copper and manganese on yield components and fibre properties of Egyptian cotton (Gossypium barbadense)

1993 ◽  
Vol 121 (2) ◽  
pp. 193-198 ◽  
Author(s):  
Z. M. Sawan ◽  
M. H. Mahmoud ◽  
B. R. Gregg
Keyword(s):  
Yield Components ◽  
Agricultural Research ◽  
Foliar Application ◽  
Field Studies ◽  
Gossypium Barbadense ◽  
Research Centre ◽  
Fibre Properties ◽  
Foliar Sprays ◽  
Egyptian Cotton ◽  
Cotton Cultivar

SUMMARYA decline in supplies of organic manures and the increased use of chemical fertilizers has led to a decrease in the micronutrient content of the soil, with attendant effects on yield.Field studies were conducted in 1986 and 1987 at the Giza Agricultural Research Centre, Egypt, to determine the effect of Cu-EDTA and Mn-EDTA foliar sprays on growth, mineral content, yield components and fibre properties of the Egyptian cotton cultivar Giza 75 (Gossypium barbadense L.).All combinations used significantly increased the uptake of Cu and Mn and the dry matter yield. The earliness of harvest and the value of yield components were all increased by the application of Cu or Mn; 25 mg/1 of both Cu and Mn gave the highest values. Lint percentage and fibre properties were not significantly affected.This study indicated that the yield of cotton, grown under otherwise standard conditions, may be increased by foliar sprays of Cu-EDTA and Mn-EDTA combined.

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