Two Types of Unfruitfulness Found in Artificial Pollination Experiments of Apple.
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Accession number;99A0922079
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| Title;Two Types of Unfruitfulness Found in Artificial Pollination Experiments of Apple. |
| Author;
KOMORI SADAO
(Minist. of Agric., For. and Fish., Fruit Tree Res. Stn.)
SOEJIMA JUN'ICHI
(Minist. of Agric., For. and Fish., Fruit Tree Res. Stn.)
TSUCHIYA SHICHIRO
(Minist. of Agric., For. and Fish., Fruit Tree Res. Stn.)
MASUDA TETSUO
(Minist. of Agric., For. and Fish., Fruit Tree Res. Stn.)
BESSHO HIDEO
(Minist. of Agric., For. and Fish., Fruit Tree Res. Stn.)
ITO YUJI
(Minist. of Agric., For. and Fish., Fruit Tree Res. Stn.)
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Journal Title;Journal of the Japanese Society for Horticultural Science
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Journal Code:F0626A
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ISSN:0013-7626
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VOL.66;NO.2;PAGE.289-295(1997)
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| Figure&Table&Reference;FIG.2, TBL.6, REF.18 |
| Pub. Country;Japan |
| Language;Japanese |
| Abstract;Two types of unfruitfulness were found in our apple breeding programs; one was in the reciprocal cross between 'Kizashi' and 'Golden Delicious' and the other in the crosses of HCR6T132, a strain bred in Purdue university, U.S.A., with pollen of other cultivars. The reciprocal cross between 'Kizashi' and 'Golden Delicious' resulted in very low rates of fruit set. Microscopic examinations revealed that pollen of both cultivars germinated normally on the stigma, but their tubes ceased growth in the upper part of the style; a number of pollen tubes formed swollen tips, indicating that the sterility was controlled by gametophytic incompatibility mechanisms. HCR6T132 yielded a high rate of fruit set when it was used as a pollen parent, whereas it failed as a seed parent. The unfruitfulness of the strain as a seed parent could not be ascribed to the incompatibility, because there was no difference in pollen tube behavior, compared with the cross compatible combinations. It was found that the fruit set was reduced when HCR6T132 flowers were emasculated (petals and anthers were removed) just before pollination; the injured flowers evolved much more ethylene than the intact ones. On intact flowers, the strains retains its fruitfulness, as did the treatment with AVG(aminoethoxyvinyl glycine), an ethylene synthesis inhibitor, to the emasculated flowers. These results revealed that the strain is probably very sensitive to ethylene and/or produces much wound ethylene, and that the unfruitfulness is ascribed to ethylene induced by emasculation. (author abst.) |
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