Study On Accumulation Of Starch And Growth Of Lycoris Chinensis Traub Bulbs

Starches are rich in bulbs of Lycoris chinensis Traub. But the development and utilization of Lycoris chinensis starches were very limited. In this paper, we have initially revealed the relationship between metabolism of starch and growth of bulbs, based on the total sugar content,starch content,starch granule size and enzyme activitiey of starch metabolism; and the research of starch properties provided theoretical bases for the practical use of Lycoris chinensis starches.The main results were as follow:1.There are same metabolism of carbohydrate in different size of Lycoris chinensis Traub bulbs, and the growth and development patterns in scale leaves was not affected by different size of the bulbs.2.The models of Lycoris chinensis Traub starch accumulation was studied in flowering state,dormancy after flowering state and leaf-expansion state. The experimental result indicated that the mode of carbohydrate transport were from outside to inside in horizontal transport, and in vertical transport were from top to bottom of morphology during flowering state. The transport of carbohydrate were also from outside to inside during dormancy after flowering state. But the transport of nutrients were from inside to outside during leaf-expansion state.3.The function of scale leaves in different parts during development were studied. The results showed:during flowering state and dormancy after flowering state, the outer scale leaves as a "source of nutrition" provided nutrients for the growth of the internal scale leaves; the middle scale leaves as a backup" source of nutrition" together with outer scale leaves provided nutrients for the growth and development of the internal scale leaves; the inner scale leaves were major activity centers of growth and development; the function of bulb plate was mainly transport and temporary storage of starch. During leaf-expansion state, the outer and middle scale leaves was changed to "nutritional library", the inner scale leaves was changed to"source of nutrition "because of part of scale leaves into the strip leaves could be photosynthesize;The role of the bulb plate was still a platforms of transport and temporary storage starch.4.Properties of starch isolated from the Lycoris chinensis Traub bulds were studied.The results showed that the average content of starch were 25.39%; amylose average content was 25.25%; the starch pastes exhibited low clarity,solubility,swelling power and poor freeze-thaw stability; but the gelatinization temperatures were high. There were different degrees of relevance among different physicochemical properties.