Varietal Difference on Morphological Change of Leaf Blade by Different Nutrient Concentration of Culture Solution in Rice Seedlings

[摘要] To make clear the internal leaf morphology concerned with varietal difference in specific leaf area (SLA) response to concentration of culture solution at the seedling stage, varietal differences in leaf morphological change with the advance of leaf position and in the response of leaf morphogenesis to nutrient concentration were investigated. Vascular bundle number (VBN) in transverse section of leaf blade and leaf width increased with the advance of position, but VBN did not increase with leaf width. Increase of leaf length with the advance of position was the greatest in NNN-type wherein nitrogen content per leaf area (NCLA) increased but SLA did not increase with nutrient concentration increase. The increase of VBN and leaf width in NNN-type were less than others. However, exceptionally in Dular, which was a variety in SSN-type wherein SLA increased with nutrient concentration, the VBN did not increase with nutrient concentration and was much more than others at every concentration. In the relationship between leaf width and length, leaf area expansion of NNN-type depended on leaf length, but others depended on leaf width increase. From these results, it was clear that SLA increase with heavy fertilization was extremely large in the varieties having many VBN by nature, and getting remarkable increase of VBN in response to fertilizer increase. Then, presumably, to improve rice productive ability efficiently in connection with fertilization, it is important that varieties have the characters, i.e. VBN and leaf width do not increase, leaf area expansion depends on the increase of leaf length, and moreover leaves are erect even under heavier fertilizer conditions.

[学科分类] 农业科学（综合）

[关键词] Concentration of culture solution;イネ;Leaf blade;形態形成;Leaf position;培養液濃度;Morphogenesis;品種間差;Rice;葉位;Seedling stage;葉身;Varietal difference;幼苗期