Effects of L-Ethionine on Adenosine Triphosphate Levels, Respiration, and Salt Accumulation In Carrot Xylem Tissue

Abstract

The time course during aging of carrot xylem disks for development of salt respiration and sensitivity of respiration to inhibition by L-ethionine was determined. 5 mM L-ethionine has no effect on the respiration of freshly cut disks, but sensitivity developed during the aging process and was maximal from 25 to 120 hr, falling to zero at 150 hr. Maximal inhibition (35-40%) coincided with the period of maximum basal respiratory rate.