On the Difference in the Resistance to the Toxic Action of Potassium Chlorate between Japonica and Indica Varieties of Paddy Rice

• Published in: Japanese Journal of Tropical Agriculture Vol. 10; no. 1; pp. 14 - 16
• Main Authors: YAMASAKI, Morimasa, NISHIYAMA, Kiichi
• Format: Journal Article
• Language: English
• Published: Japanese Society for Tropical Agriculture 1966
• ISSN: 0021-5260; 2185-0259
• DOI: 10.11248/jsta1957.10.14

The seeds as well as germinating seeds of varieties of Japonica and Indica type, each 7 in number, were treated for certain hours with the solution of KClO3, followed by washing with water and being allowed to grow on seed beds and, after several days when young seedlings attained 2-3cm in height, the toxicant resistance was determined by testing the symptoms of injury on both their leaves and rootlets. According to the results obtained, it was shown that Japonica varietyes were generally more resistant than Indica ones to the toxicant resistance between rice varieties of above-noted two different type. Based upon the hypothesis ever proposed by Yamasaki, one of the authors, the toxicant resistance of plants to the chlorate depends on their quantity of reducing matters which convert the chemical into hypochlorite (KClO), much poisonous to plants. Accordingly, the results obtained, it is supposed, will afford certain suggestions for further comparative physiological studies on Japonica versus Indica type of paddy rice.