Light induced transpiration in a chlorophyll deficient mutant of Hordeum vulgare

Abstract

AbstractA chlorophyll deficient mutant of Hordeum vulgare L. was investigated with respect to its transpiration response to light pulses. Broad band blue light. 380–500 nm, caused a significant transpiration response, while broad band red light did not. The transpiration response to changes in the ambient CO2‐concentration was the same in the chlorophyll deficient mutant as in green plants. The absence of a transpiration response to red light in the mutant was therefore not the result of a defective CO2‐response. It is concluded that the specific blue light response is not mediated via photosynthetic CO2‐fixation. The nature of the blue light response is discussed.