Factors affecting haploid production in wheat using the Hordeum bulbosum system. 2. The effect of the timing of pollination |
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| Authors: | L A Sitch J W Snape |
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| Institution: | (1) Plant Breeding Institute, Maris Lane, Trumpington, CB2 2LQ Cambridge, Great Britain;(2) Present address: International Rice Research Institute (IRRI), P.O. Box 933, Manila, Philippines |
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| Abstract: | Summary The effect of manipulating the timing of pollination on the fertilization frequency in wheat × tetraploid Hordeum bulbosum hybridizations was investigated as a possible means of overcoming varietal incompatibility in this cross. Pre- and post-anthesis pollinations were made on previously identified highly crossable and poorly crossable wheat genotypes and the stage of development of the individual florets at pollination was expressed in  days from anthesis units.In both crossable and non-crossable wheat genotypes, a significant negative linear relationship was observed between floret age and fertilization frequency. The magnitude of the response of early pollination was dependent on the number of alleles for non-crossability present at the Kr loci. The non-crossable cultivar Highbury, possessing more than one allele for incompatibility, showed a slight response. The greatest response was shown by the highly crossable cultivar Chinese Spring, possessing alleles for crossability at all Kr loci. The single chromosome substitution line, Chinese Spring (Hope 5B), possessing the most potent allele for non-crossability, Kr
1, showed an intermediate response. The H. bulbosum genotype had no effect on the magnitude of this response, influencing only the mean fertilization frequency. |
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| Keywords: | Triticum aestivum wheat Hordeum bulbosum crossability timing of pollination frequency of fertilization |
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