早在一个世纪以前就发现,植物的生长与发育是受其体内所产生的一些物质——“激素”调节的。随后又发现,植物根系的生长、向性生长、开花及果实发育等都受这些物质的支配。阳光、空气及土壤养分和水分为植物生长提供原料,而这些激素则巧妙地调节着植物的骨架、叶片、花及果实的特性。 A century ago, it was discovered that the growth and development of plants are regulated by the “hormones” produced by some of the substances in their bodies. It was subsequently discovered that the growth, vegetative growth, flowering and fruit development of the plant roots are governed by these substances. Sunlight, air and soil nutrients and moisture provide the raw material for plant growth, and these hormones skillfully regulate the plant’s skeleton, leaf, flower and fruit characteristics.