Meiotic stability of durum strains derived from Triticum durum x T. timopheevi crosses.

摘要

Meiotic stability and pollen stainability were studied in 45 durum strains derived from T. durum x T. timopheevi crosses, and their 4 durum parents. Out of 34 BC2 derivatives from the tenth generation of selfing, none segregated for any phenotypic trait, however, presence of univalents in 20% emphasized the importance of meiotic screening of interspecific derivatives. Despite five generations of selfing of nine BC2 derivatives, 44% were either segregating for phenotypic traits, or showed spike sterility, or even univalent formations leading to their instability at the genic level. It could be deduced that T. timopheevi introgressed derivatives take more generations of selfing to stabilize. Eight derivatives carrying univalents also showed high pollen stainability revealing thereby that stainability of pollen does not give any definite indication of meiotic instability.