Studies on Hibiscus. (III)
An interspecific hybrid of H. mutabilis L. and H. Moscheutos. L
1958 Volume 27 Issue 3 Pages 201-206
Details
1958 Volume 27 Issue 3 Pages 201-206
In order to get new ornamental types in Hibiscus, interspecific crosses were made with 6 different species (Table 2. Tachibana et al. 1957). Three combinations H. mutabils×H. Moscheutos, H. coccineus×H. Moscheutos and H. Moscheutos×H. Coccineus, pro-duced fertile F1 seeds(Table 3). This paper concerns the characteristics of F1 plants obtained from the first cross which seems unusual and interesting because the parent species are entirely different in their chromosome numbers and status (mutabilis: woody shrub; 2n=92, 100. Moscheutos: pereenial herb; 2n=38).
1) The F1 plants were markedly poor in vegeta-tive development and about half of them died during earlier stages of growth, although wide variations in vitality were found among them (Table 5).
2) The F1 plants developed several woody shoots in the second year and had very late flowering (Fig. 2). Other characteristics such as leaf shape, color and size of flowers, size and pubescence of seeds, etc. were generally intermediate between those of the parents or more or less mother-like (Tables 6_??_9).
3) Since they showed a high degree of sterility, only a very few seeds were obtained from F1 plants having Moscheutos-K strain as father plant which seemed somewhat heterozygous. Back-crosses with mutabilis pollen yielded slightly more seeds.
4) A greater part of the pollens of F1 plants was transparent and abortive (Fig. 4). Remarkable abnormality was observed in the tetrad formation stage (Fig.5).
5) A few F1 plants seemed somewhat promising for ornamental use owing to their long flowering season and increased flower numbers
