A role for salicylic acid and NPR1 in regulating cell growth in Arabidopis

Citation
H. Vanacker et al., A role for salicylic acid and NPR1 in regulating cell growth in Arabidopis, PLANT J, 28(2), 2001, pp. 209-216
Citations number
24
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Plant Sciences","Animal & Plant Sciences
Journal title
PLANT JOURNAL
ISSN journal
0960-7412 → ACNP
Volume
28
Issue
2
Year of publication
2001
Pages
209 - 216
Database
ISI
SICI code
0960-7412(200110)28:2<209:ARFSAA>2.0.ZU;2-Z
Abstract
Salicylic acid (SA) plays a key role In activating defenses and cell death during plant-pathogen interactions. In response to some pathogens, SA also limits the extent of cell death, indicating that it acts positively or nega tively depending on the host-pathogen interaction. In addition, we previous ly showed that SA affects cell growth in the Arabidopsis defense-related mu tants accelerated cell death 6-1 (acd6-1) and aberrant growth and death 2 ( agd2). Using acd6-1, agd2 and two other defense-related mutants, lesion sim ulating disease 6 (Isd6), suppressor of SA-insensitivity (ssi1), we show he re in detail that SA regulates cell growth by specifically affecting cell e nlargement, endoreduplication and/or cell division. We find that SA can act either positively or negatively to regulate cell growth depending on the c ontext in which signaling occurs. Additionally, Nonexpressor of PR 1 (NPR1) , a key SA signaling protein important for regulating defenses and cell dea th, also acts to promote cell division and/or suppress andoreduplication du ring leaf development. We propose that SA interacts with multiple receptors or signaling pathways to control cellular alterations during normal develo pment, pathogen attack and/or stress situations. We suggest that SA and NPR I play broader roles in cell fate control than has previously been understo od.