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KMID : 0903620010420050561
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Journal of the Korean Society for Horticultural Science
2001 Volume.42 No. 5 p.561 ~ p.567
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Relationship between Pistil Receptivity and Cross Compatibility in 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 expand genetic variations of H. syriacus L., 20 cultivars of H. syriacus, three hybrids of H. syriacus×H. paramutabilis, one hybrid of H. syriacus×H. sinosyriacus, and H. sinosyriacus were used. Interspecific single, three way, and double crosses were made to investigate cross compatibility and the relationship between crossability and pistil receptivity. The crossability among the combinations was measured by the index of seed set (ISS). In reciprocal interspecific crosses between 20 cultivars of H syriacus and H sinosyriacus, viable seeds were produced only by crosses between H. syriacus×H. sinosyriacus. ISSs of the 18 compatible crosses of H. syriacus×H. sinosyriacus were low, ranging from 0 to 0.054 except three combinations which represented high ISSs above 0.149. Reciprocal three way crosses between interspecific hybrids (H. syriacus×H. paramutabilis) and H. sinosyriacus showed strong incompatibilities. The reciprocal double crosses between H. syriacus×H. paramutabilis hybrids and H. syriacus×H. sinosyriacus hybrid, however, showed higher crossabilities than three way crosses and produced viable seeds. Thus, to incorporate genes from H. paramutabilis and H. sinosyriacus into H. syriacus, double crosses between interspecific hybrids seemed to be more effective than triple crosses. The degrees of incompatibilities among the interspecific single crosses, three way crosses, and double crosses were related to the pollen tube growth and tube numbers in the pistil; the speed of pollen tube growth was slow and the number of pollen tubes decreased in the style of the incompatible crosses.
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