Studies on transplanting injury in rice [Oryza sativa] plant, 9: Effects of transplanting on the morphological changes of new leaves and roots of seedlings after transplanting
1990
Yamamoto, Y. (Kochi Univ., Nankoku (Japan). Faculty of Agriculture) | Matsuoka, T.
Using the materials in the previous report, effects of transplanting per se and pruning part by transplanting procedures on the outer and inner morphology of new leaves on the main stem and new roots emerged after transplanting were studied. 1) Effects of transplanting on the leaf sheath length, leaf blade length and leaf area, and leaf width and number of stomata were severest on the 5th, 6th, and 7th leaf, respectively and those except leaf width and number of stomata were reduced in order of seedling without pruning (TP-S) with pruning all leaf blades (LC-S) with pruning all roots (RC-S) than those of non-transplanted ones (DS-S). The total number of stomata on the 6th leaf blade was not significantly different among the seedlings, because the greater the leaf area reduced, the higher the density was. All the seedlings were almost equal in number of vascular bundles of the 6th leaf blade, but distances between large or small vascular bundles and leaf blade thicknesses were less in order of TP-S RC-S LC-S than those of DS-S. 2) The diameter of new roots measured at 1 cm from their base on the 3rd and 7th day after transplanting was larger in order of DS-S TP-S RC-S LC-S, mainly depending on the thickness of cortex, and significant difference was found even between DS-S and TP-S. These results suggested that morphological changes of newly emerged leaves and roots in transplanted seedlings were closely related to their early growth through the photosynthetic ability of the leaves and water or nutrient absorption rate of the roots
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