Abstract
Tendrils observed many climbers coil around a suitable support in touch with that. It has known that the coiling of tendrils is promoted by idole-3-acetic acid (IAA), although this mechanism is not clear. In this report, I investigated the influence of IAA on coiling of tendrils. Squash plants were grown in 1/5-strength Hoagland's nutrient solution at 25.5°C under white light for 12 h per day in over 3 weeks to get the tendrils. Exogenous IAA was strongly stimulated the tendril coiling of squash. Indole-3-acetaldehyde was also strongly stimulated that, although tryptophan and indole-3-acetnitrile were only slightly stimulated. Endogenous IAA concentrations for growth of tendrils were similar levels, whereas those concentrations decreased after starting of rolling up because of aging.
