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類似生長素藥劑對於植物的生理效應常是複雜而多方面的,譬如,它可以用來誘導枝條的生根,蕃茄的結實,延遲許多器官的脫落,抑制發芽等等。對於一種組織或器官來說有時它促進生長,有時轉而為抑制,有時甚至引起毒害,究竟是促進,抑制,還是毒害,一方面要看這類藥劑的結構,濃度,用量與使用方法,另一方面要看當時植物及其器官的生理狀態〔6.7〕。類似生長素藥劑試用過的不下百餘種α-荼乙酸與2,4-D(2,4一二氯苯醉代乙酸)就是其中常用的兩個。當施用α-萘乙酸於棉株時即使0.01%亦不易引起毒害現象,而以0.001%2,4-D處理棉株時就能產生抑制生長的效應。以類似生長素藥劑處理棉株時2,4-D低濃度(0.00005-0.0002%)可以促進生長,防止分離層的形成,延遲或制止器官的脫落;較高的濃度(0.001-0.002
Physiological effects of auxin-like agents on plants are often complex and multifaceted. For example, they can be used to induce rooting of shoots, firmness of tomatoes, delay in the shedding of many organs, suppression of germination, and the like. Sometimes a tissue or organ promotes growth, sometimes into inhibition, and sometimes even poisoning, whether it promotes, inhibits, or poisones, on the one hand the structure, concentration, amount and use of such agents Method, on the other hand depends on the physiological status of plants and their organs at that time (6.7). Similar to the auxin agent tried no less than a hundred kinds of α-tocopheryl acetate and 2,4-D (2,4-dichlorobenzene into acetic acid) is one of the two commonly used. When 0.01% of a-naphthalene acetic acid was applied to the cotton plants, it was not easy to cause toxicity. However, cotton plants treated with 0.001% 2,4-D had the effect of inhibiting growth. Low concentration of 2,4-D (0.00005-0.0002%) could promote growth, prevent the formation of separation layer, delay or stop the shedding of organs when cotton plants were treated with auxin-like agents. The higher concentration (0.001-0.002