Effect of Auxin Treatment on the Occurrence of "Hollow Root" of 'Gensuke'

Abstract

A cultivar of Japanese radish, 'Gensuke' is cultivated mainly in the sand dune regions in Ishikawa Prefecture. This radish is marketed at a high price in the central wholesale market in Kanazawa City during the period from the end of September to the middle of October. Therefore, the radish is sown from August 10 onwards, and furthermore, sowing during July is much needed among the growers in these districts. In this case, however, "hollow root" which has lengthwise hollownesses in the central part of the root induced by a physiological disorder (s) has been frequently observed. This gives much trouble to the growers in these districts. By the way, Takano observed the increases of meristematic tissues and rays of condcuting tissues in radish roots by naphthalene acetic acid (NAA). Therefore, for the purpose of the prevention of occurrence of hollow root, this research was carried out to investigate the influences of NAA on the growth and the occurrence of hollow root of 'Gensuke'.