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Studies on the growth hormones of plants

1943; Botanical Society of Japan; Volume: 57; Issue: 677 Linguagem: Inglês

10.15281/jplantres1887.57.195

2185-3835

Masayuki Nagao,

Magnetic and Electromagnetic Effects

It is known that the coleoptile of rice-seedlings elongates remarkably under water. To see the effect of growth substances on the elongation above mentioned, β-indolylacetie (IA), β-indolylpropionic (IP), α-naphthylacetic (NA), and phenylacetic acids (PA) were taken as such in this investigation.The etiolated rice-seedlings with coleoptiles 7-12mm long were immersed in 10cc of the solutions of the above compounds in test tubes. The roots of the seedlings had been removed before immersing the plants. A single seedling was set in each test tube. The experiments were carried out at 30°C in the dark.The increase in length of coleoptiles after a period of 18 hours was nearly proportional to the longarithm of the concentration of growth substances within a certain range. Of the substances studied, IA and NA were the most effective, and IP ranked next, while PA showed only a small activity. The present work indicates that, under a certain condition, the rice-seedlings can be used as one of the test plants for the study of growth substances.