译 名：
SEGREGATION OF CHARACTERS OF THE INTERGENERIC HYBRID BETWEEN GOSSYPIUM AND HIBISCUS
摘 要：
K. Y. Chow 1. The hybrid under consideration is obtained by inarching G. nanking to G. hirsutum, and then crossed with Hibiscus rosa-sinensis. In hybrid F_1, some characters appeared to resemble G. barbadense or G. Peruvianum. Furthermore, the F_1 plants are of the early-rippen type with apical grow- th. Up-to-date, they have been growing on the ground of Fukien Agri- cultural College for four successive years (Fig. 9) without any sign of deterioration in vigor. 2. The F_2 plants varied greatly in their characters. Many of them actually appeared as the G. barbadense or the G. peruvianum. Some indi- viduals resembling that of G. braziliense appeared too. Some Plants were found to be very hairy, others cold resistant, and still others having lint- less seeds with different gradation of fuzz or even naked. Judging from the above mentioned phenomena, the auther is of the opinion that in the tropical or subtropical region G. barbadense, G. Peruvianum and G. braziliense may have been arosed from the natural intergeneric crossing between G. hirsutum and Hibiscus. At least this is one of their possible origin. Also, it is possible that new cotton type may have been produced from this intergeneric hybridization. 3. In F_2 the length of the lint (Fig. 1) varied from 0-48mm., individuals with lint length ranging fyom 27. 5 to 35. 0mm. being the most abundant. Lint percentage varied from 0-50％. Percentages ranging from 20-35％ represent most of the population. 4. The seeds (Fig. 1) varied from naked to very fuzzy. Most of them were tufted, while others naked or fuzzed. The color of the fuzz might be white, grey, brown or green. 5. The flowers (Fig. 3) showed very complicated features. The size of the flowers and the pollen grains (Fig. 5) were generally larger than those of their parent G. hirsutum. The color Of the petals and anthers migbt be white or different gradation of yellow in different plants, the last mentioned being the most commonly occurred. The floral petal with different gradation of red base also appeared. Some of the flowers might have 6, 7, or even 10 petals, a condition quite different from the normal 5-petaled flowers. The 10-petaled flowers were actually formed by the combination of two normal 5-petaled flowers togather. The 6- or 7 petaled flowers appeared normal. In some cases, the stigma protruded out of the bud. Other abnormal female and male organs were also found (Fig. 2). 6. The form of the boll (Eig. 4) varied from spherical to elongated conical or cylindrical with different acuteness in its apex. In most cases, the boll appeared to be very similar to that of G. barbadense, while in others, they looked like those found in the various cotton types. 7. The hybrid were very branchy (Fig. 6). This feature was par- ticularly pronounced in the fruit branch (Fig. 7) which might be branch- ing 4-5 times. There were 5 buds growing from one node of the fruit branch, with one of them producing boll and the other 4 buds deve- loping into fruit branches again. 8. Also, the form of the leaves (Fig. 8) varied greatly. Most of the leaves and the veins became coarser than those of their parents. The form of the leaves contained the types of G. naking, G. hirsutum, G. barba- dense. G. peruvianum or G. braziliense, even okra. In the middle part of some branches, one or two leaves appeared like those of Hibiscus rosa-sinensis. The above indicates that the intergeneric hybrid showed very compli- cated variation in characteristics. It is believed that through such inter- generic crossing some most desirable cotton types mignt be obtained. Hence, this may be considered as a useful method in the breeding and selective work in the cotton plants.
