Degradation of protein and chlorophyll was delayed in
the detached leaves,because of the presence of cytokinin in the
medium.
The senescence in the
detached leaves was controlled by cytokinin
first by keeping the stomata open thus allowing more carbondioxide
to enter.This whole phenomenon was observed by Richmond and Lang in
the year 1967.
This senescence is a developmental process actively initiated
as part of an age-dependent genetic program or in response to
environmental stress.