LACTONE DERIVATIVE,AND PLANT GROWTH REGULATOR AND ROOTING AGENT EACH CONTAINING THE SAME AS ACTIVE INGREDIENT

摘要

A lactone derivative represented by the following general formula (I), which has excellent rooting activity; and a plant growth regulator containing the derivative as an active ingredient. (I) [In the general formula (I), R1 and R2 each is hydrogen, halogeno, C1−6 alkyl, or C1−6 alkoxy; A is methylene, vinylene, imino, oxygen, or sulfur; and n is an integer of 1 to 4; provided that when A is imino, then R1 and R2 each is not hydrogen, and when A is oxygen, then both are hydrogen.]