NamDU - Ilmiy axborotnomasi Ushbu tadqiqotda optimal dala sharoitida o‘stirilgan 18 ta malina (Rubus idaeus L.) navlarining barglaridagi nisbiy suv miqdori (RWC) va xlorofill indeksi (SPAD...

Wheat (Triticum aestivum L.) is one of the oldest cultivated crops in human history and forms the backbone of global agriculture due to its strategic importance (Shewry 2009). This crop continues t...

The restricted genetic diversity of current cotton varieties (Gossypium hirsutum L.) considerably limits breeding opportunities aimed at enhancing fiber quality and resistance to environmental factors. Wild types of allotetraploid cottons are valuable sources of genetic variation, and their breeding potential has not yet been fully utilized. In this study, the inheritance and variability of important agronomic traits were analyzed in F₁ and F₂ hybrid generations obtained from intra- and interspecific crosses involving G. hirsutum, G. barbadense, and G. darwinii. The phylogenetic relationships of allotetraploid species were analyzed using molecular-genetic and cytogenetic methods, and their breeding potential was evaluated. Cytogenetic analysis of the F₁ hybrids revealed the occurrence of univalents at metaphase I of meiosis, while bivalent numbers reached 25.9 in some hybrid combinations. Based on molecular marker analysis, significant genetic differences and polymorphism were identified between var. gambia and var. m. palmerii. There were reciprocal translocations, shown as multivalents, during ecotypic differentiation in other cross combinations. Positive transgressive segregation for the enhancement of fiber length was identified in F₂ populations. Notably, in certain hybrid combinations, fiber length extended to 40.9 mm. Furthermore, molecular analysis identified 113 unique alleles across the genotypes examined. These findings affirm that wild and exotic allotetraploid cotton forms constitute a significant source of genetic diversity for breeding programs.