Summary
Phytohormones like IAA and kinetin inhibit chlorophyll loss during aging of wheat chloroplasts duringin vivo andin vitro. GA, on the other hand, stimulates the pigment degradation during aging of attached leaves in contrast to its senescence inhibiting action in detached leaves and isolated chloroplasts. A shift in optimum concentration of hormone in inhibiting chlorophyll degradation suggests a differential pool size of endogenous hormone regulating aging of chloroplastsin vivo andin vitro. The retardation of chlorophyll loss by kinetin, IAA and GA during aging of chloroplastsin vitro would indicate that the effect of hormones in preventing yellowing of senescing leaves may be mediated through their direct action on chloroplasts.
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Misra, A.N., Biswal, U.C. Effect of phytohormones on chlorophyll degradation during aging of chloroplastsin vivo andin vitro . Protoplasma 105, 1–8 (1980). https://doi.org/10.1007/BF01279845
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DOI: https://doi.org/10.1007/BF01279845