So I found my post above to be slightly in error when I mentioned "photorespiration" - that is an informal term that should be corrected with the following clarification:
Photosynthesis
So "photorespiration" is not really a textbook term. I was thinking about this concept:
"In C3 plants, under conditions of low soil moisture and hot, drying winds, the stomatas of the leaves will close in order to conserve water, which then blocks the flow of CO2 into the leaf. When this occurs, the entry of CO2 into the leaf is restricted, resulting in a dramatic drop in photosynthesis."
So "photorespiration" would be a bad thing if heat and/or drought is causing your plants to stop respiration. RESPIRATION is the correct term.
"Respiration is the release of energy stored in carbohydrates when the plant is making ATP for itself. In a sense, using the photochemical reactions of photosynthesis (CO2 + H20 + Light = C(H20) + O2) and using electrons (gained from electromagnetic light waves striking pigments in the chloroplast thylakoids) to make carbohydrates."
Did you know?
-"Glucose is the source of energy for metabolism and provides some of the "raw material" for other metabolites throughout the plant. Glucose can combine with other sugar molecules to form compounds such as sucrose, startch, and cellulose. Startch and cellulose are chains of glucose molecules linked together."
So, plants make carbohydrates and use that for energy (plants need Glucose as the starting molecule for respiration) in order to make the "ingredient list" for ATP. A plant uses glucose to basically make NADH & FADH. These pass through a cascade of enzymatic Electron Transfer reactions and ATP + O2 + H2O are the net energy product of respiration.
Plants are autotrophs, meaning they can make carbohydrates out of thin air and water. Literally! We animals and humans are not that capable and are labeled heterotrophs, meaning we MUST eat plants or eat animals that eat plants.
So in short, don't let your plants dry out and respiration is when the plant releases oxygen and water vapor due to making carbohydrates. Respiration comes to a halt if the plant runs out of water at the root zone or if the environment causes a defensive reaction (very dry and hot). No respiration, no carbohydrates are being made. No carbohydrates = no growth.
All sources and quotes taken from the text:
McMahon, Margaret , Anton Kofranek, and Vincent Rubatzky. Plant Science: Growth, Development, and Utilization of Cultivated Plants, 5th ed. Prentice Hall, 2011