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Evidence that the partial resistance of the Arabidopsis 5‐2 mutant to fusicoccin depends on a decreased capacity of the H+ pump to respond to activating factors

Measurements of H + extrusion activity K + influx, and E m in 3-d-old seedlings of the 5-2 mutant of Arabidopsis thaliana (which is partially insensitive to fusicoccin) showed the following. (i) The reduced response of 5-2 to fusicoccin (FC) does not depend on the penetration of FC to its site of action, or on decreased affinity of the FC receptor. (ii) The reduced response of H + and K + transport to FC does not depend on an impairment of the K + absorption system. (iii) The mutation can influence the H + extrusion system independently of the presence of FC. In the presence of factors other than FC known to activate the plasma membrane H + -ATPase (e.g. a cytosol-acidifying treatment), the response in 5-2 is about 50% lower than in wt. (iv) When both genotypes grow in optimal conditions, the rate of fresh weight increase and stem elongation is higher in wt than 5-2. These data indicate that the 5-2 mutation affects some intrinsic component of the H + extrusion machinery, the limiting effect of which becomes considerable when either the physiological or the experimental conditions induce a high level of proton pump activity. An alteration either of the ATPase itself or of a factor controlling its activity is compatible with our observations.