Studies on the growth of excised root between indica-japonica hybrids and japonica type in paddy rice
1989
Kim, J.H. | Sheo, I.S. | Lee, S.C. (Sunchon National Univ., Sunchon (Korea R.))
The experiments were carried out to compare the growth characteristics of excised seminal roots in Japonica type, Indica-Japonica hybrids and its parents. Based on the modified culture medium by Kawataet al., several levels of pH, sucrose and casamino acid were varied in the culture media. The excised root length at 27deg C incubator was little different between Japonica type and Indica-Japonica hybrids, but at 30deg C incubator the excised root elongation of Indica-Japonica hybrids was much better than that of Japonica type. The dry matter weight of excised root in Indica-Japonica hybrids was significantly heavier than in Japonica type at both 27 and 30deg C incubators. The difference of dry root weight between Japonica type and Indica-Japonica hybrids was caused from the number of lateral roots, especially the root numbers of 25 cm length. The main and lateral seminal root growth of Japonica type grew best at the lot of 0.2 % casamino acid. However, the lots of 0 and 0.2 % casamino acid showed good results in the main and lateral excised root growth, respectively of Indica-Japonica hybrids. The growth of excised roots was better in Indica-Japonica hybrids than in Japonica type at even various levels of pH, sucrose and casamino acid. Between the parents of Indica-Japonica hybrids, the excised root growth of Indica type was more predominant than that of Japonica type, and the effect of casamino acid on the excised root growth in the formar was similar to that of Indica type. This result indicated that the growth characteristics of excised seminal roots in Indica-Japonica hybrids were derived from the parent, Indica type
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