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Vol. 16, No. 9, pp. 1139-1149, May 1, 2002
Max-Planck-Institut für Züchtungsforschung, Abteilung Biochemie,
50829 Köln, Germany
In Arabidopsis, WRKY factors comprise a large gene family of
plant-specific transcriptional regulators controlling several types of
plant stress responses. To understand the regulatory role of WRKY
proteins during such processes, we identified targets of the
senescence- and defense-associated WRKY6 factor. WRKY6 was found to
suppress its own promoter activity as well as that of a closely related
WRKY family member, indicating negative autoregulation. On the other
hand, WRKY6 positively influenced the senescence- and pathogen
defense-associated PR1 promoter activity, most likely involving
NPR1 function. One novel identified target gene, SIRK, encodes
a receptor-like protein kinase, whose developmental expression is
strongly induced specifically during leaf senescence. The
transcriptional activation of SIRK is dependent on WRKY6
function. Senescing leaves of wrky6 knockout mutants showed a
drastic reduction, and green leaves of WRKY6 overexpression
lines showed clearly elevated SIRK transcript levels.
Furthermore, the SIRK gene promoter was specifically activated
by WRKY6 in vivo, functioning very likely through direct W-box
interactions.
[Key Words: cDNA-AFLP; WRKY transcription factor; receptor kinase; SIRK; autoregulation; PR1]
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