Field experiments were carried out during two successive seasons 2002 and
2003 on saline sandy soils at El-Maghara Research Station, Desert Research Center,
North Sinai to study the effect of genetic variations of some cotton varieties i.e. Giza
45, Giza 70. Giza 83 and Giza 85 ) and some different foliar application treatments .
i.e. ZnSOi 0.1%, MnSO4 1.0%, FeSO; 0.5% and tap water as control on yield, yield
components lint quality and some biochemical genetic markers of some cotton
varieties. A split plot design with three replications was used. The main plots were
devoted at random to four spray-foliar application treatments and four cotton varieties.
in the sub plots. The obtained results could be summarized as follows'
The result indicated that genetic variability were detected clearly among the
four cotton varieties in yield, yield components and lint quality. Giza 83 cultivar
exhibited a significant higher values and considered the highly yield and its attributes.
Generally. foliar application treatments may correct the metabolic disturbance under
stress conditions of El-Maghara, Agric Research Station (sandy and saline soil).
Foliar applications by Zf‘lSO-i 01%| MnSO4 1.0% , and FeSO; 0.5% led to improve
growth parameters. yield, yield components and lint quality of all cotton varieties as
compared with the control during both seasons Zn804 0.1% surpassed the other
spray treatments for increasing all studied parameters of cotton varieties under
investigation Also ZnSO.. 0 1%, combined with Giza 83 cultivar interaction achieved
the best treatment .The Extra long staple varieties had longer , stronger and finer than
the long staple varieties. Also. micronutrients (Zn'e, Mn“2 and Fe'zl as a foliar
application exhibited a slight improve for fiber pr0perties.
Random amplified polymorphic DNA (RAPD) and five random ‘iO-mer primers
were used to amplify DNA via polymerase chain reaction (PCR)‘ 31 RAPDs were
generated and 15 (48.4%) were polymorphic.Similanty matrix was generated from
RAPE) results Dendrogram generated by UPGMA analysrs, detected that long stable
varieties layed near each other. The same was true with extra-long stable ones. Also.
each variety had its unique RAPD markers. The same was true in case of 808.
Protein markers. ln-addition‘ newly synthesised bands either under deficiency or
applications of different micronutrients. could be used as marker — assisted selection
for higher yield varieties under this conditions. The obtained results could be used by
cotton breeders and producers to got higher yield and lint percentage or have lint
qualities.