Premium
Constitutive activation of a CC‐NB‐LRR protein alters morphogenesis through the cytokinin pathway in Arabidopsis
Author(s) -
Igari Kadunari,
Endo Sachiko,
Hibara Kenichiro,
Aida Mitsuhiro,
Sakakibara Hitoshi,
Kawasaki Tsutomu,
Tasaka Masao
Publication year - 2008
Publication title -
the plant journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.058
H-Index - 269
eISSN - 1365-313X
pISSN - 0960-7412
DOI - 10.1111/j.1365-313x.2008.03466.x
Subject(s) - arabidopsis , mutant , biology , mutation , downregulation and upregulation , microbiology and biotechnology , morphogenesis , gene , genetics , leucine rich repeat , cytokinin , auxin
Summary Possible links between plant defense responses and morphogenesis have been postulated, but their molecular nature remains unknown. Here, we introduce the Arabidopsis semi‐dominant mutant uni‐1D with morphological defects. UNI encodes a coiled‐coil nucleotide‐binding leucine‐rich‐repeat protein that belongs to the disease resistance (R) protein family involved in pathogen recognition. The uni‐1D mutation causes the constitutive activation of the protein, which is stabilized by the RAR1 function in a similar way as in other R proteins. The uni‐1D mutation induces the upregulation of the Pathogenesis‐related gene via the accumulation of salicylic acid, and evokes some of the morphological defects through the accumulation of cytokinin. The rin4 knock‐down mutation, which causes the constitutive activation of two R proteins, RPS2 and RPM1, induces an upregulation of cytokinin‐responsive genes and morphological defects similar to the uni‐1D mutation, indicating that the constitutive activation of some R proteins alters morphogenesis through the cytokinin pathway. From these data, we propose that the modification of the cytokinin pathway might be involved in some R protein‐mediated responses.