Difference of functional compositions of Indica-Japonica rice landraces in Yunnan
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    Abstract:

    A study on functional compositions of rice, which including 111 improved varieties of Yunnan province and 77 Yuanyang local varieties. Using Cheng's index to distinguish indica-japonica rice, spectrophotometry determination content of functional compositions (including resistant starch of polished rice; g-aminobutyric acid and flavones of unpolished rice), at last using SPSS software analysis the data.The main results are as follows:(1)All samples' content of RS is Indica>Indica-like>Japonica-like>Japonica,but content of GABA is opposite,the relationship between Flavones and Indica-Japonica type is inconspicuous;(2)Content of RS and Flavones is colored>colorless,but content of GABA is colorless>colored. In a word,as to the functional content,colored>colorless、Indica>Japonica、unpolished>polished、local>improved.The colored、Indica、unpolished、improved type is best.It recovers the relationship between Indica-Japonica type、colored-colorless、local or improved、polished or unpolished ice and functional compositions.

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