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GENETIC DIVERSITY OF AEGILOPS VARIABILIS (2n=4x=28; UUSS) FOR WHEAT IMPROVEMENT: MORPHO-CYTOGENETIC CHARACTERIZATION OF SOME DERIVED AMPHIPLOIDS AND THEIR PRACTICAL SIGNIFICANCE

A. MUJEEB-KAZI*, ALVINA GUL*, MUHAMMAD FAROOQ, SUMAIRA RIZWAN and JAVED I. MIRZA

Abstract: The tertiary gene tetraploid Aegilops variabilis (2n = 4x = 28; UUSS) is an alien germplasm resource that provides much needed genetic diversity for resistance to Cochliobolus sativus (spot blotch) and Tilletia indica (Karnal bunt). This resource has been hybridized with several durum and bread wheat cultivars yielding cytologically normal F₁ hybrids (2n = 4x = 28, ABUS or 2n = 5x = 35, ABDUS) from which fertile amphiploid progenies of 56 (2n=8x=56, AABBUUSS) and 70 chromosomes (2n=10x=70, AABBDDUUSS) were derived. The morphology and cytogenetics of these cross combinations plus their amphiploids, screening data for spot blotch and karnal bunt response under field conditions is reported to elucidate some probable strategies that would permit genetic transfers from Ae. variabilis into the recipient durum and bread wheat germplasms.
 

National Institute of Biotechnology & Genetic Engineering (NIBGE), Faisalabad, Pakistan.
National Agricultural Research Center (NARC), Islamabad, Pakistan.