Study On Breeding And Growth Regularity And Physiological Character Of Ramie Low-branch Cuttage Seedling Technology

Ramie is an important spin material and one of important export product in China. As its many spin excellences, more and more people are interested in ramie fabric. New planted ramie often have defects of fewer efficient plant numbers, many high-branches, difficult to peel bast, low yield, bad fiber quality and so on. In order to improve the yield and quality of raw fiber, increase the planting area of ramie, we study on the rapid and efficient ramie breeding technology. Adopting the new method of cultivation in the field and combining the comprehensive analysis, growth and development regularity, root physiological character, photosynthetic characteristics and the nourishment characteristic ect of low-branch and regular method breeding were studied. We preliminary understand the morphological and physiological basis of low-brand cuttage seedling breeding technology of new planted ramie, and provide solid foundation for the cultivation techniques of new planted ramie of low-brand cuttage seedling breeding.1.The cutting characteristics (diameter, length, leaf number) had important effects to seedling survival rate of low-branch cutting seedling and the quality of ramie seedling: the cutting with mid-diameter, 10cm length and about 4 leaves, had higher seedling survival rate and better quality of ramie seedling.To cultivating low-order branch ramie seedling, cutting 1.5cm was suitable and don't over 3cm, and cutting more densely. The correlation between the cuttings length of low branches of ramie and the survival rate, dry root weight of individual plant, the recruitment of stem height, dry leaves weight of individual plant and the characteristic of branch with four different kind of ramie varieties, the result shows that there were a significant positive correlation between the cutting length and dry leaves weight of individual plant the number of branches, the lowest branch, the highest branch, the length of each branch distance, but significant negative correlation between the length and the survival rate, dry root weight of individual plant, the recruitment of stem height, but no significant correlation between different varieties. Significant negative correlation could be observed between cutting density and dry root weight, stem height recruitment, dry leaves weight, branch length; negative correlation could be observed between cutting density and quantities of branches, dry branche weight. And significant positive correlation were detected between the density and thelowest branch. From all above, it indicated that the optimum length, density, leaf number and depth of cutting plant were about 10 cm, 10cm×10cm ,3-4 leaf and 1.5-3.cm respectingly.2.Topping make the root volume and gross absorption area, active absorption area and ratio face area of the ramie low-branch seedling large and increase its accumulation of soluble protein in root of individual plant and promote its power of root. The strong root and the high light effect leaf construct together for the good material condition of low-branch seedling growth. Topping promote photosynthesis of the ramie low-branch seedling, providing the stronger material foundation for its growth.3.Topping increase N,P,K,the soluble sugar accumulation quantity ofindividual plant in the seedling stage of the ramie low-branch seedling and increase the soluble protein accumulation quantity in leave of individual plant and promote NR vigor of leave. The nourishment metabolism in the seedling period is prosperous.4.The low-branch new planted ramie has well growth underground parts, more root activity than the regular method, which develop nutrients for the new plant and accumulae the growth of overground part. The low-branch new plant ramie also has significantly higher population density, leaf area, leaf area index, leaf area, chlorophyll content, the net assimilation rate, population growth, etc than the regular method . It laid a solid foundation of the high yield for the next year..5.For the low-branch new planted ramie, the total N, P, K and the N, P, K in the bast, boon and leaf respectively was higher than the regular method; but it is opposite in reproductive organs. In the low-branch and the regular method new planted ramie, the distribution regulation of the content of N, P, K is the same: the N content distribution in the early stage is leaf> boon > bast, in the later stage is leaf> bast>boon; the Pcontent distribution in the early stage is boon>leaf>bast, in the later stage is leaf>boon >bast; the K content distribution in the early stage is boon> bast> leaf, in the later stage is bast > boon > leaf. 6.Even the same variety, the low-branch new planted ramie is higher at plant height, stem diameter, bast thickness ect than the the regular method new planted ramie, but not reach significant difference. The bast stripping percentage, effective stalks, raw fiber yield of the low-branch new planted ramie are significantly higher than the regular method new planted ramie.