Department of Botany, University of Michigan, Ann Arbor.
Planta. 1969 Sep;87(3):206-16. doi: 10.1007/BF00389365.
Ethylene inhibits hook opening in the bean hypocotyl and at high concentrations induces closure of the hook. Indoleacetic acid and 2,4-dichlorophenoxyacetic acid, whose inhibitory effect on hook opening resembles that of ethylene, stimulate ethylene production from the hook tissue, and this ethylene production is physiologically active in inhibiting hook opening. It is concluded that the inhibition of opening by auxin is due at least in a major part to auxin-induced ethylene production by the hook tissue.Carbon dioxide promotes hook opening, apparently by antagonizing the action of endogenous ethylene. The concentration of respiratory CO2 in the internal gas space of the hook tissue is high enough to play a role in the regulation of hook opening.Red light causes a decrease in ethylene production and an increase in CO2 evolution from the hook tissue. These effects are partially reversible by far-red light. It is concluded that both ethylene and CO2 serve as natural growth regulators which mediate the hypocotyl hook-opening response to light in bean seedlings.
乙烯抑制豆下胚轴弯钩的张开，在高浓度下诱导弯钩的闭合。吲哚乙酸和 2,4-二氯苯氧乙酸对弯钩张开的抑制作用类似于乙烯，它们能刺激弯钩组织产生乙烯，而这种乙烯的产生在抑制弯钩张开方面具有生理活性。因此可以得出结论，生长素对弯钩张开的抑制作用至少在很大程度上是由于生长素诱导弯钩组织产生乙烯。二氧化碳促进弯钩张开，显然是通过拮抗内源乙烯的作用。弯钩组织内部气体空间中的呼吸二氧化碳浓度足够高，足以在调节弯钩张开中发挥作用。红光导致乙烯产生减少和 CO2 从弯钩组织中释放增加。这些效应可以部分被远红光逆转。因此可以得出结论，乙烯和 CO2 都作为天然生长调节剂，介导了豆苗下胚轴弯钩对光的反应。
