The newly synthetic allohexaploid wheat species Triticum kiharae (IMAGE)
Caption
The newly synthetic allohexaploid wheat species Triticum kiharae (GGAADD), generated by crossing allotetraploid Triticum timopheevii (GGAA) with diploid Aegilops tauschii (DD) followed by colchicine-induced chromosomal doubling, exhibited meiotic irregularities in chromosome pairing as well as numerical and structural chromosome variations in selfed progeny populations. F1 hybrids from a cross between T. kiharae and bread wheat (T. aestivum, BBAADD) were male-sterile but female-fertile, confirming intrinsic postzygotic reproductive isolation between the two species while enabling backcrossing of sterile F1 hybrids to bread wheat. These features provide a feasible route to simultaneously introgress standing congeneric genetic variations from both T. timopheevii and Ae. tauschii, as well as heritable de novo variations that have arisen in T. kiharae into bread wheat.
Credit
Dr. Long Mao, FROM CHINESE ACADEMY OF AGRICULTURAL SCIENCES
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CC BY-NC-ND