Two plant growth regulators suitable for cymbidium cultivation

(1) Cytokinins Based on their components, they are divided into three major categories: purine cytokinins, urea cytokinins and tRNA cytokinins. Their physiological effects are: 1. promoting cell division and cell enlargement; 2. promoting the meristematic activity of undifferentiated tissues and inducing the sprouting of dormant buds (lateral buds); 3. chlorophyll synthesis and chloroplast replication, preventing leaf aging and the flow of metabolic substances. At present, when orchid enthusiasts treat orchid plants to induce dormant buds to sprout, they use cytokinins at a concentration of 3% to promote lateral bud differentiation. 4. After use, lateral buds sprout, aboveground growth is good, the root system grows persistently, and the newly grown leaf buds can rely on the old plant for nutrients and maintain growth. (2) Gibberellins (commonly known as GAs) Due to improvements in purification techniques and advances in analytical techniques, 116 kinds of gibberellins (GAs) are currently known. The GAs sold are divided into GA1, GA2, GA3 and GA4, and their effects are not all the same. Their main physiological effects are: 1. promoting stem elongation by promoting cell division and cell growth; 2. breaking dormancy, root growth, leaf growth and flowering; 3. promoting the differentiation of flowers, leaves and buds; 4. promoting and inhibiting leaf differentiation, etc. At present, when orchid enthusiasts treat orchid plants to increase their growth rate, they use a 2% solution or 3.1% powder of GA to promote stem and leaf elongation and shorten the growth period. However, different cymbidium varieties have different sensitivities to such agents. Improper concentration often causes excessively long stems and leaves, changes in plant form or variation in flower shape. CymbidiumcultivationThe ultimate goal is to increase yield, promote rapid growth, shorten the production period and achieve economic value. Cymbidium varieties differ, and tissues in different parts of the plant have different sensitivities to growth hormones. Generally, growing points, young leaves and meristematic tissues are more sensitive to growth hormones, while stems and old leaves are less sensitive. Growth hormones are chemical substances that can stimulate orchid growth and development at extremely low concentrations. If gibberellins are used to promote cymbidium leaf elongation, shorten the growth period or break dormancy, the differences among cymbidium varieties and their different sensitive responses to gibberellins should first be considered. When using them, the concentration must be adjusted according to the needs of the orchid plant to avoid changes in plant form. Generally, cymbidium plants of the slender-leaf type are taller and have longer leaves, and require more plant growth hormones to stimulate growth, while dwarf cymbidium varieties contain fewer growth hormones and more growth inhibitors, and are more sensitive to growth hormones. I once used G, G, BA4 plus cytokinins, carefully researched, synthesized and produced by the floriculture research institute of a famous university in Taiwan, China, to treat cymbidium plants, supplemented with a fairly good phospholipid synthase. In the Chengdu area of Sichuan, where high and low temperatures are more extreme, based on experience mainly with Chun JianHui Lan, I found that it had very good effects on promoting lateral bud differentiation, root growth, growth rate and an increase in leaf number. However, onChun Lan, Xia Lan and cymbidium plants, after observation, the same effects as above could also be obtained. As one of the plant growth regulators, sprouting agents can promote the sprouting ability of cymbidium plants and rapid growth, achieving the goals of improving quality, increasing yield and shortening the growth period. But after all, sprouting agents are not a magic pill. To successfully treat plants and achieve the desired effect, one needs to understand the physiological and biochemical characteristics of cymbidium, master the correct treatment "method", "site", "timing", "technique", "application skills", "water quality" and "correct concentration", and combine this with years of practical experience and an understanding of the characteristics of the agent. Only in this way can the due efficacy of the sprouting agent be brought into play, so as to achieve the purpose of regulating cymbidium growth and promoting cymbidium sprouting.