ISSN:
1432-2242
Keywords:
Key words Wheat
;
Tripsacum dactyloides
;
Wide crosses
;
Fertilization
;
Embryo formation
Source:
Springer Online Journal Archives 1860-2000
Topics:
Biology
Notes:
Abstract The Hexaploid wheat variety Fukuho was crossed with Tripsacum dactyloides. The total fertilization frequencies for the egg cell, polar nuclei, and both, were 58.3%, 26.8% and 58.9% of the 168 ovaries examined. However, the fertilization frequency of single polar nuclei was much lower at only 0.6%. The total frequency of fertilization was higher than that in wheat × maize crosses. A total of 49 hexaploid wheat varieties, including Hope carrying the dominant genes Kr1 and Kr2, were crossed with T. dactyloides, and most gave embryos. The embryo-formation frequencies ranged from 0.5% to 59.0%. A higher frequency of 32.0% embryo formation was obtained following pollination of the variety Hope. In comparison with embryo formation in wheat × maize crosses the difference of embryo-formation frequencies between the two crosses was significant. The results of high frequencies of fertilization and embryo formation in wheat ×T. dactyloides crosses indicated that the Kr genes are as inactive in wheat ×T. dactyloides, as they are in wheat × maize crosses, and also that the efficiency of fertilization and embryo formation is higher in wheat ×T. dactyloides than in what × maize crosses. The potential of wheat ×T. dactyloides crosses for wheat haploid production and wheat improvement is discussed.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/s001220050237
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