Fibre Breeding And Formation Of Yield And Quality Of Kenaf Male Sterile Hybridism

According to 23 character's measurement of four varieties, which each of them were dealt with defloration and burliness, and by sampling once a week, ten times in all, fibre's development rule of kenaf's male sterile hybrid were studied. According to 8 yield and quality character's measurement of three varieties in two different stages, which each of them was dealt with defloration and burliness, the formation of last yield and quality and the appropriate harvest of kenaf's male sterile hybrid were studied. The results showed as follow:1. Plant height, stem diameter, bark thickness, whole fresh stem weight, dry jackstraw, fresh bark weight and dry bark weight of the defloration developed faster than that of the burliness later. Compared each character of the defloration with that of the burliness, the stage of the difference they showed were different: plant height, whole fresh stem weight and dry jackstraw were in 22 days or so after anthesis; fresh and dry bark weight in 29days or so; stem diameter and bark thickness in 36 days or so. Therefore, sterile kenaf variety had higher yield trend and potential, and showed it through some sensitive character to defloration such as plant height, fresh whole stem weight, and dry jackstraw etc.2. Ratio of bark to jackstraw of the same variety between the defloration and the burliness showed no significant difference, and couldn't show male sterile kenaf variety's excellence or badness. Variance of rate of bark to jackstraw showed excellent kenaf with larger value of rate of bark to jackstraw could be selected.3. The mean of the length and the cellar wall thickness of phloem fibre were steady and weren't influenced significantly by defloration or burliness. The mean of the width and the lacuna of phloem both minish and weren't influenced significantly by defloration or burliness. Each of the number of the layer, the group and the bundle and the fibre strip thickness of phloem fibre of the defloration treatment increased faster than that of the burliness, and showed difference in 29 days after anthesis, accordant with the stage of bark weight and bark thickness between the two treatment of one variety. The mean of the cell number per bundle fibre was steady and wasn't influenced by defloration or burliness significantly. Therefore, faster increasing of the phloem yield brought by defloration treatment resulted in that of the number of fibre layer, group and bundle and the fibre strip thickness.4. The mean of the fibre length, width, lacuna, wall thickness and the ratio of wall thickness to lacuna didn't influence by defloration or not. The micro-mechanism of faster increasing of xylem caused by defloration than by burliness result in faster increasing of the total number of xylem fibre.5. The last mean of plant height, stem thickness, bark thickness, fresh whole stem weight, dry jackstraw and nice hemp weight of each variety between defloration and burliness were significant or most significant in two different period harvests, so male sterile kenaf variety inferred to be higher yield.6. Between the defloration and the burliness, the mean of fibre strength and fibre fineness of each variety both showed no significant difference on Sep. 18th harvest, the mean of fibre strength showed significant difference and the mean of fibre fineness showed no significant difference on Oct. 10th. Defloration improved fibre quality in later anthesis, and longer appropriate harvest adopted according to yield requirement after quality satisfied with technics.In all, delaying harvest to anthesis, earliness kenaf male sterile hybridism concluded to increase yield and improve quality by using both heterosis and male sterile superiorit, and expected to be an important direction in kenaf breeding.