The site of action of crossability genes (Kr
1, Kr
2) between Triticum and Secale. II. Proportion of pistils containing pollen tubes and effects of alternate pollination on seed set |
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| Authors: | B S Jalani J P Moss |
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| Institution: | (1) Department of Agricultural Botany, University of Reading, Reading, England;(2) Present address: Genetics Unit, National University of Malaysia, 22-12 Kuala Lumpur, Malaysia;(3) Present address: International Crops Research Institute for Semi-Arid Tropics (ICRISAT), P.O., 502 324 Patancheru, Andhra Pradesh, India |
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| Abstract: | Summary Different wheat genotypes (T. aestivum) were crossed with rye to ascertain the site or sites of manifestation of the crossability genes, Kr
1 and Kr
2. By using fluorescence microscopy, it was found that the order of increasing proportion of wheat micropyles containing pollen tubes is strongly correlated with the levels of crossability with rye. High crossable genotypes have more micropyles containing pollen tubes than those of the low crossable ones. Most of the inhibition or retardation of pollen tubes occurred between the style base and top of the embryo sac, expecially with the low crossable genotypes where both Kr-genes are present. The results also indicate that Kr
1 is a greater inhibitor than Kr
2. Seed set is also highly correlated with the number or proportion of micropyles having pollen tubes. Alternate pollinations seem to support the view that rye pollen tubes do not reach the micropyles of the low crossable genotypes, and hence when repollinated with wheat selfed seeds are produced. |
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| Keywords: | Triticum aestivum wheat Secale cereale rye crossability pistils pollen tubes seed set |
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