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Home >> Haploid Production and Uses >> Wheat Haploids Through Crosses with Hordeum H.Bulbosum
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Wheat Haploids Through Crosses with Hordeum H.Bulbosum - Barclay (1975) demonstrated that the haploids in hexaploid wheat (var. Chinese Spring) can also be produced through chromosome elimination in hybrids of wheat with H. bulbosum (both 2x and 4x). A frequency of 13.7% grain set with 2x bulbosum and 43.7% grain set with 4x bulbosum, were obtained.

In order to explore the possibility of further use of this technique in wheat breeding programmes, studies were conducted at Cambridge (U.K.) on the crossability of wheat with H. bulbosum (Snape et - al., 1979). It was found that most of the European varieties did not cross, but four of the six Australian varieties were successfully crossed.

A similar crossability pattern of wheat varieties was observed with rye also so that it was concluded that crossability with rye and H. bulbosum was controlled by same genetic factors. Through the use of chromosome substitution lines, it was also shown that 1B, 1D, 2D, 3A, 3D, 4A, 4B and 6D in the variety Hope have genes promoting crossability, while 5A and 5B have genes reducing crossability.

In view of the limitation of crossability with only few wheat varieties, H. bulbosum can not be extensively used for production of haploids in common wheat.