Abstract
AbstractSeveral transpiration suppressants, (phenyl mercuric acetate, Tag 16 (polyethylen emulsion) R14‐poly (ethylene adipate) 4–4 Diphenylmethan diisocyanate), which are known to either close stomata or form thin films on leaves, were sprayed on citrus and grapevine seedlings. Water vapor and carbon dioxide exchange of single leaves were measured by means of infra red gas analyzer and L1C1 hygrosensors. The effects of the chemicals were evaluated by analyzing net photosynthesis, transpiration, mesophyll resistance to CO2 compensation concentration and respiration. All the chemicals tested increased either mesophyll resistance or CO2 compensation point to various degrees. It is concluded that none of the chemicals tested acted solely on epidermal resistance. All chemicals reduced photosynthesis, but the ratio of photosynthesis to transpiration increased in most cases in grapevine but not in citrus. Different chemicals acted differently on citrus and grapevine. The method of analysis used enabled us to evaluate separately the relative effect of a chemical on mesophyll resistance and respiration.
Published Version
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call