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SRL1 : a new locus specific to the phyB‐signaling pathway in Arabidopsis
Author(s) -
Huq Enamul,
Kang Yurah,
Halliday Karen J.,
Qin Minmin,
Quail Peter H.
Publication year - 2000
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 - 10.1046/j.1365-313x.2000.00810.x
Subject(s) - arabidopsis , mutant , biology , genetics , phytochrome , phenotype , locus (genetics) , gene , wild type , hypocotyl , population , ectopic expression , red light , botany , demography , sociology
Summary As part of an effort to isolate new Arabidopsis mutants specifically defective in responsiveness to red light, we identified srl1 (short hypocotyl in red light) by screening an EMS‐mutagenized M 2 population derived from a phytochrome B (phyB)‐overexpressor line (ABO). The srl1 mutant shows enhanced responsiveness to continuous red but not far‐red light, in both wild‐type and ABO backgrounds, consistent with involvement in the phyB‐signaling pathway but not that of phyA. The hypersensitive phenotype of srl1 is not due to overexpression of endogenous phyA or phyB, and the locus maps to the center of chromosome 2, distinct from any other known photomorphogenic mutants. srl1 seedlings display enhancement of several phyB‐mediated responses, including shorter hypocotyls, more expanded cotyledons, shorter petioles and modestly higher levels of CAB gene expression under red light than the wild type. Double mutant analyses show that the hypersensitive phenotype of srl1 is completely phyB‐dependent. The data suggest, therefore, that SRL1 may encode a negatively acting component specific to the phyB‐signaling pathway.