Relationships between the Contents of Carbohydrates and Cell Wall Materials in the Stems of Rice during Grain Filling.

Abstract

Hitomebore, a popular rice variety in Tohoku, was cultured in 1997 by using standard practice (CON), the practice of nitrogen-free basal dressing with sparse planting (BNo), and BNo with the application of 200 gm-12 of raw rice bran (RB). The contents of nonstructural carbohydrates (NSC), cell wall materials (ADF) and ash in stems (culms and leaf sheaths) were analyzed during the grain filling. The percentage of NSC based on dry weight was higher in BNo and RB than in CON, and also higher in the lower internodes than in upper ones. In contrast, the percentage of ADF was smaller in BNo and RB and in the lower internodes. The contents of ash whose main component is silica, showed that it was quite similar to that of ADF. The correlation coefficient between the percentages of ADF and NSC was negative, but between the percentages of ADF and ash it was positive and highly significant. The correlations for the amount of ADF per unit area with the amounts of NSC and ash were positive and highly significant. The dry weight of stems was closely correlated to the amounts of ADF, NSC, and ash. No correlation was noted with respect to their percentage.