What is the relay pump theory? Vital activities of xylem parenchyma and xylem rays?
According to Godlewski there is a rhythmic change in the osmotic pressure of the living cells of xylem parenchyma and medullary rays which brought about a pumping action of water in an upward direction. The living cells absorb water due to osmosis and is passed to xylem vessels. The tracheids and vessels acted as water reservoirs.
One more doubt-
Malate ions produces malic acid with H ions lowering its synthesis by PEP carboxylase.
what does this mean? 'its' refers to what?
its refer to malic acid.
thank you ma'am. but i still didn't get the malic acid line.