By D. R. Cameron (auth.), Ralph Riley, K. R. Lewis (eds.)
Read or Download Chromosome Manipulations and Plant Genetics: The contributions to a symposium held during the Tenth International Botanical Congress Edinburgh 1964 PDF
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Extra info for Chromosome Manipulations and Plant Genetics: The contributions to a symposium held during the Tenth International Botanical Congress Edinburgh 1964
Two possible ways of obtaining hexaploid endosperms are (I) gametes with 24 chromosomes function, one going to the central cell of the female gametophyte, (2) gametes with 12 chromosomes function, both going to the central cell of the female gametophyte. Two lines ofindirect evidence support (2). One is the observation that one-third of the developing seeds with hexaploid endosperms did not possess embryos. It is difficult to imagine fertilisation of the egg often failing thus, if a male game te is available for fertilisation.
However, it may be more productive to use a cytological method for checking possible relationships involving not only these chromosomes but also such chromosomes as the ones just mentioned that underwent translocation in haploids. A promising cytological method was indicated by the discovery by Okamoto (19S7) and Riley (19S8) of the suppressing effect which chromosome SB exerts on homoeologous pairing. With chromosome SB missing (or its effect suppressed), pairing maypresumably be obtained between chromosomes 44 CHROMOSOME MANIPULATIONS AND PLANT GENETICS with only a small segment in common.
The remaining combination, nulli-7B tetra-7A, is no less fertile than nulli-7B; it makes a taU er plant; and its spikes are almost completely normal, whereas those of nulli-7B tend to be sterile in the upper portion. Therefore it may be concluded that all the nullisomic-tetrasomics in this group exhibit compensation, although necessarily of a lower order than that in söme of the other groups. TABLE 4 Chromosome constitution Chromosomes involved Nulli Tetra IB ID 2B 2D 3A 3B 3D 3D 4B 4D 5B 5B 5D 6A 6A 6B 6B 7A 7B 7D IA IA 2D 2B 3B 3D 3A 3B 4A 4B 5A 5D 5B 6B 6D 6A 6D 7B 7A 7A Totals of offspring of nullisomic-tetrasomics No.