Endogenous Growth Substances of Citrus Tissues1

Abstract

Studies of growth and development in plants have been imbued with attempts to characterize and identify the endogenous growth substances of plant tissues and to relate changes in their quantities to processes in which they are assumed to participate. Studies of endogenous growth substances can be regarded from the horticultural point of view as complementary to those based upon exogenously supplied growth regulators, leading to better understanding of the developmental processes involved and, eventually, facilitating the practical control of horticultural production.