Effects of dwarfing genes on cell length and cell number in the first leaf of rice [Oryza sativa]
1992
Kamijima, O. (Kobe Univ. (Japan). Faculty of Agriculture) | Inoue, Y. | Misoo, S. | Sawano, M.
Actions of dwarfing genes on cell division and cell elongation in the first leaf of seedling of rice were investigated using a normal variety "Shiokari" and its seven dwarf near-isogenic lines. Two parenchyma cell files lining in a row along the outer and inner epidermis, respectively, were observed for measurement of cell number per file and cell length. Length of the first leaf of all the dwarf lines except Sh-d3, 4, 5 was significantly shorter than that of Shiokari, and the degree of shortening in Sh-d1 and Sh-d18h was greater than the other dwarf lines. In both the cell files, cell number and mean cell length in Sh-d18h were ca. 70 % and ca. 60 % of the corresponding values of Shiokari, respectively. In Sh-d1, cell number was also reduced drastically to less than 60 % of Shiokari while shortening of cell length was slight. Sh-d3, 4, 5 had significantly larger cell number than did Shiokari, but there was no significant difference for cell length between these two lines. The cell number was very highly correlated with the first leaf length, while the relationship between the cell length and the first leaf length was somewhat weak when taking account of all the lines used in this study. These facts indicate that the genotypic difference in the first leaf length depend generally upon the difference in the activity of cell division, though there are some dwarfing genes which inhibit cell elongation remarkably
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