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KMID : 0903620010420050568
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Journal of the Korean Society for Horticultural Science
2001 Volume.42 No. 5 p.568 ~ p.574
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Effect of Flowering Season on the Compatibilities of Interspecific Single , Three Way , and Double Crosses among Hibiscus syriacus , H. sinosyriacus , and Interspecific Hybrids (H. syriacus × H. paramutabilis
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Abstract
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To study the cause of seasonal changes of compatibilities in crosses among H. syriacus, H. sinosyriacus, and interspecific hybrids (H. syriacus×H. paramutabilis), stigma receptivity, pollen tube growth, and the relationship between the number of pollen tubes in the stylar tissue and fiuit and seed setting were investigated in early (July), middle (August), and late (September) flowering season of H. syriacus. In interspecific single crosses between cultivar of H. syriacus and H. sinosyriacus, high seasonal fruit and seed setting varied, depending on the combinations. Peak of fruit and seed setting was lowest during late flowering season. However, pollen viability and stigma receptivity were higher in late season than in middle season. In early and middle flowering seasons, numerous pollen tubes penetrated into ovaries between 12 and 24 hours after pollination, but in late flowering season, a few pollen tubes penetrated into ovaries between 24 and 48 hours after pollination. The decreased number and delay of pollen tube penetration into the ovary resulted in low fruit and seed setting in late flowering season. A few viable seeds were produced only at early flowering season in the three way and double interspecific crosses. No viable seed was obtained in late flowering season. These results were closely related with slow pollen tube growth in the styles and few penetration of pollen tubes into the ovary in late flowering season.
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