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Mol Plant Microbe Interact 16: 289–294 Xin Z, Browse J (1998) Eskimo1 mutants of Arabidopsis are constitutively freezing-tolerant. Proc Natl Acad Sci USA 95: 7799–7804 Xin Z, Mandaokar A, Chen J, Last RL, Browse J (2007) Arabidopsis ESK1 encodes a novel regulator of freezing tolerance. Plant J 49: 786–799 Yang S, Hua J (2004) A haplotype-specific resistance gene regulated by BONZAI1 mediates temperature-dependent growth control in Arabi￾dopsis. Plant Cell 16: 1060–1071 Yang S, Yang H, Grisafi P, Sanchatjate S, Fink GR, Sun Q, Hua J (2006) The BON/CPN gene family represses cell death and promotes cell growth in Arabidopsis. Plant J 45: 166–179 Yi H, Richards EJ (2007) A cluster of disease resistance genes in Arabidopsis is coordinately regulated by transcriptional activation and RNA silenc￾ing. Plant Cell 19: 2929–2939 Zhang Y, Goritschnig S, Dong X, Li X (2003) A gain-of-function mutation in a plant disease resistance gene leads to constitutive activation of downstream signal transduction pathways in suppressor of npr1-1, constitutive 1. Plant Cell 15: 2636–2646 Zhou F, Mosher S, Tian M, Sassi G, Parker J, Klessig DF (2008) The Arabidopsis gain-of-function mutant ssi4 requires RAR1 and SGT1b differentially for defense activation and morphological alterations. Mol Plant Microbe Interact 21: 40–49 Zhu J, Jeong JC, Zhu Y, Sokolchik I, Miyazaki S, Zhu JK, Hasegawa PM, Bohnert HJ, Shi H, Yun DJ, et al (2008) Involvement of Arabidopsis HOS15 in histone deacetylation and cold tolerance. Proc Natl Acad Sci USA 105: 4945–4950 Zhu Y, Qian W, Hua J (2010) Temperature modulates plant defense responses through NB-LRR proteins. PLoS Pathog 6: e1000844 Function of a Mutant RPP4 in Response to Chilling Plant Physiol. Vol. 154, 2010 809