No abstract

Indole, α‐ and β‐naphtol are synergistic with auxins in enhancing root production of cuttings of Phaseolus vulgaris. To find an explanation for this synergism the activity was compared with that of phenolic compounds which are known to be: a. inhibitors of the IAA oxidase system, b. cofactors of the conversion of tryptophane to IAA. Both processes appeared to occur in the bean cuttings (as estimated by root production), but none of the phenols bad an activity equally strong as the “synergists”. It is suggested that indole as well as α‐ and β‐naphtol act as other injurious substances in “just sublethal” dose (Soekarjo 1966).

No abstract

Growth of three varieties of dwarf peas was compared with growth of a tall variety. Dwarfism is determined by light intensity. No difference was found between the effects of light of narrow spectral regions (460 mμ, 560 mμ, 589 mμ and 660 mμ) of high energy (17.000 ergs/sec/cm2). A transitory difference in growth inhibition was found between the dwarfs and the tall variety.