Study On Characteristics Of Starch And Protein Accumulation In Different Amylose Content Rice Varieties

In this experiment, 4 rice varieties (Snow pearl, the most inferior amylose content, Koshihikari, the lower amylose content, Gang you527 the medium amylose content, Hoshiyutaka, the high amylose content) were used to study the characteristics of the grain starch and protein accumulation through a general method of cultivation and management, The main results were as followed:1.During grain filling, the high amylose content rice varieties have higher Chlorophyll content, wider leaves areas, higher souble sugar content in stem, sheaths i leaves, larger export amount of soluble sugar in leaves and sheaths and longer continuance of soluble sugar supply in stem than low amylose content rice varieties.2. The soluble protein of stems, sheaths and leaves of all varieties were high at the early filling stage. And it gradually became low with grain growing. And the soluble protein of leaves, sheaths of moderate and high amylose content rice varieties have an increase stage of soluble protein which lasts 3~9 days after anthesis, the cause of soluble proteins content and changes in leaves and sheaths of different rice varieties was decided by the end protein content.3. The content of sugar was the highest at the start of filling stage, and it became low during the later development. The content of sugar was consumed before 9 days of a thesis in high amylose content rice varieties. The content of sugar was rare after 21 days of a thesis in super low amylose content rice varieties, and sugar of low amylose content was keeping a low supplement level. The sugar of a thesis moderate and high amylose contentrice varieties went up with the increase of blowing days.4. Lots of Free amino acid in all rice varieties accumulated during the early stage of grain filling. And it decreases step by step during 30 days after anthesis. Free amino of low and high amylose content rice varieties acid dips quickly. And the lack of free amino acid of low and high amylose content rice varieties was obvious in the later grain filling stage.5. The accumulation of amylose of all rice varieties agreed with the change of grain weight. Amylose content of grain was low during early grain filling, and then it increased. The amylose content in high amylose content rice varieties was always higher than that in the low amylose content rice varieties during the whole grain filling. The amylose accumulation was significiantly different during 3~-9 days after anthesis, the high amylose content rice varieties have strong ability of producing amylose and high speed of amylose accumulation. The amylopecrion accumulation speeds of the seeds of low amylose varieties were high in the first 9 days after anthesis.6. Protein accumulation of different rice varieties was seemly similar; the protein of grain was high at the beginning of grain filling. Then it became low. but protein accumulation didn't decrease after the 12 days of flowering. Of all the varieties, the high amylose content varieties were had the most protein content increase, the moderate amylose content varieties were next to high amylose ones. According to the absolute amount of Protein accumulation of per grain, it rose quickly during 0~15 days of anthesis, and the protein accumulation was always at a high level during the whole grain filling; The speed of protein accumulation was higher in the prophase of grain filling. The protein content of low and high amylose content decreased quickly in the prophase of a thesis, and the protein content of moderate amylose content decreased slowly at the same time. As for the changing of protein content in every grain, the protein content depended on the grain weight. The varieties, which have high amylose content, didn't have low seeds protein content necessarily.