The impact of externally supplied protein on root and phytohormone in endangered species cercidiphyllum japonicum cutting seedling

Abstract

Whether soaking or injected by BSA, low to intermediate (≦ 7.58 μ M) concentrations of BSA improved rooting rate of cuttings and higher (≧ 15.15 μ M) concentrations of BSA significantly decreased the rooting rate of cuttings. The effect on the rooting rate by the method of BSA injected are significant than that of BSA soaking cuttings. Both of soaked and injected cuttings with low to intermediate (≦ 7.58 μ M) concentrations of BSA markedly increased the average number of lateral roots and the average root length. The treatment of the injection had a remarkable effect on the average number of lateral roots and average root length than that of soaking whether the low or high concentration of BSA. The magnitude of changes of the endogenous GA, ABA, ZR and IAA of the cuttings were bigger in the cuttings treated by injecting than that of soaking in each stage after cutting. This study adds the understanding that organic nitrogen effects on the cuttings root formation, growth and endogenous hormone changes.