A disomic substitution line of a common wheat chromosome 5D for 5B of durum wheat.

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Abstract
On the bases of morphological features, 2 plants having 28 chromosomes were selected in a selfed progeny of 13" + 2'' plant that was obtained from recurrent backcrossing of the offspring of monosomic 5B common wheat ([Triticum aestivum] ''Chinese Spring'') .times. T. durum Stewart with ''Stewart''. Those plants were crossed with ''Stewart'' durum and with ditelosomic 5D of ''Chinese Spring''. The F1 individuals showed meiotic pairing of 13" + 2'' in the former cross and 1" hm + 13" + 7'' in the latter, where 1 hetermorphic pair belongs to chromosome 5D. Those 2 plants could be identified as the disomic substitution of 5D for 5B of ''Stewart'' durum. The substitution line was slightly different from normal ''Stewart'', showing thicker culm, lux ear and early ear emergence. It is highly fertile and can be easily maintained.

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