The chloroplast-localised metalloprotease EGY1 and Mg-dechelatase SGR1 control chloroplast development and senescence by modulating photosynthetic functions.

Mutations in EGY1 and SGR1 reveal chlorophyll homeostasis as a key regulator of chloroplast development and plant senescence in Arabidopsis.

• Why it matters: Understanding how chloroplast function influences plant aging and development can inform strategies to improve crop resilience and longevity, addressing gaps in knowledge about chlorophyll metabolism's role in these processes.
• What they did: Researchers identified a mutant (egy1-5) with defective chloroplasts and senescence traits, performed a suppressor screen, and found mutations in SGR1 that restored normal leaf color, revealing interactions between EGY1 and SGR1 in chlorophyll regulation.
• The result: The study shows that chlorophyll homeostasis, mediated by EGY1 and SGR1, controls chloroplast development and senescence, enabling potential manipulation of plant aging through chlorophyll metabolism pathways.