Several factors have to be considered in evaluating reports on the role of ethylene on photosynthesis. Experiments utilizing ethephon may be difficult to interpret because of the pH effect of phosphonic acid. Both ethylene and ethephon regulate four processes which can affect photosynthesis. These processes include: (1) stomate size; (2) leaf angle; (3) chloroplast integrity; and (4) sink activity in tissues such as apical meristems, leaves, and fruits. Superimposed on this physiological labyrinth is the phenomenon of species sensitivity. A number of cases have been reported in which one species or cultivar will respond to ethylene and another either will not or is much less sensitive.
đang được dịch, vui lòng đợi..