Phytochrome control of chlorophyll content in mature attached leaves of Petunia axillaris

Casal, J.J.; Aphalo, P.J.

Phytochrome control of chlorophyll content in mature attached leaves of Petunia axillaris

1989

Casal, J.J. | Aphalo, P.J.

Petunia axillaris plants were grown under white light (photoperiod 10 h). Pulses of end-of-day far-red light, but not red light at the end of the day slowed down the accumulation of chlorophyll in expanding, greening leaves and reduced chlorophyll content in mature leaves. The chlorophyll a / b ratio was unaffected. Low phytochrome photoequilibria reduced chlorophyll content in mature leaves without affecting leaf area or d. wt. This effect occurred even before senescence was triggered in the control plants having high phytochrome photoequilibria.

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