Early seed development in Triticum-Secale amphiploids

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Abstract
Considerable variation was observed in the early embryo and endosperm developmental patterns of several Triticum durum .times. Secale species (africanum, cereale, dighoricum, kuprijanovii, montanum, segetale, vavilovii) amphiploids. However, the Triticum - S. africanum hybrid was the only which developed at a faster rate than either of its parents. Its endosperm became cellular and began depositing starch at least 24 h before any previously analyzed cereal. The influence of Secale DNA and heterochromatin on the developmental patterns of the amphiploids was exactly the opposite of that in the genus Secale itself (i.e., as the amount of telomeric heterochromatin increases developmental speed decreases). The results, in general, suggest that the control of Secale developmental characteristics, whether they are genotypic or nucleotypic, are suppressed when placed in a wheat background.

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