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Knock-out of ferritin AtFer1 causes earlier onset of age-dependent leaf senescence in Arabidopsis by Irene Murgia; Valentina Vazzola; Delia Tarantino; Françoise Cellier; Karl Ravet; Jean-Francois Briat; Carlo Soave is a Agricultural and Biological Sciences article available to read on EtoBox.

What is Knock-out of ferritin AtFer1 causes earlier onset of age-dependent leaf senescence in Arabidopsis about?

Ferritins are iron-storage proteins involved in the regulation of free iron levels in the cells. Arabidopsis thaliana AtFer1 ferritin, one of the best characterized plant ferritin isoforms to date, strongly accumulates upon treatment with excess iron, via a nitric oxide-mediated pathway. However other environmental factors, such as exposure to oxidative stress or to pathogen attack, as well as developmental factors regulate AtFer1 transcript levels. In particular, recent findings have highlighted an accumulation of the ferritin transcript during senescence. To investigate the physiological relevance of AtFer1 ferritin during senescence we isolated an Arabidopsis mutant knock-out in the AtFer1 gene, which we named atfer1-2. We analyzed it together with a second, independent AtFer1 KO mutant, the atfer1-1 mutant. Interestingly, both atfer1-1 and atfer1-2 mutants show symptoms of accelerated natural senescence; the precocious leaf yellowing is accompanied by accelerated decrease of maximal photochemical efficiency and chlorophyll degradation. However, no accelerated senescence upon dark treatment was observed in the atfer1 mutants with respect to their wt. These results suggest that A

Who reads Knock-out of ferritin AtFer1 causes earlier onset of age-dependent leaf senescence in Arabidopsis?

Author

Irene Murgia; Valentina Vazzola; Delia Tarantino; Françoise Cellier; Karl Ravet; Jean-Francois Briat; Carlo Soave

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 0981-9428)

Published

2007

Language

EN

Field

Agricultural and Biological Sciences (Life Sciences)