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Low red/far-red ratios reduce Arabidopsis resistance to Botrytis cinerea and jasmonate responses via a COI1-JAZ10-dependent, salicylic acid-independent mechanism.
Plant Physiol. 2012 Apr; 158(4):2042-52.PP

Abstract

Light is an important modulator of plant immune responses. Here, we show that inactivation of the photoreceptor phytochrome B (phyB) by a low red/far-red ratio (R:FR), which is a signal of competition in plant canopies, down-regulates the expression of defense markers induced by the necrotrophic fungus Botrytis cinerea, including the genes that encode the transcription factor ETHYLENE RESPONSE FACTOR1 (ERF1) and the plant defensin PLANT DEFENSIN1.2 (PDF1.2). This effect of low R:FR correlated with a reduced sensitivity to jasmonate (JA), thus resembling the antagonistic effects of salicylic acid (SA) on JA responses. Low R:FR failed to depress PDF1.2 mRNA levels in a transgenic line in which PDF1.2 transcription was up-regulated by constitutive expression of ERF1 in a coronatine insensitive1 (coi1) mutant background (35S::ERF1/coi1). These results suggest that the low R:FR effect, in contrast to the SA effect, requires a functional SCFCOI1-JASMONATE ZIM-DOMAIN (JAZ) JA receptor module. Furthermore, the effect of low R:FR depressing the JA response was conserved in mutants impaired in SA signaling (sid2-1 and npr1-1). Plant exposure to low R:FR ratios and the phyB mutation markedly increased plant susceptibility to B. cinerea; the effect of low R:FR was (1) independent of the activation of the shade-avoidance syndrome, (2) conserved in the sid2-1 and npr1-1 mutants, and (3) absent in two RNA interference lines disrupted for the expression of the JAZ10 gene. Collectively, our results suggest that low R:FR ratios depress Arabidopsis (Arabidopsis thaliana) immune responses against necrotrophic microorganisms via a SA-independent mechanism that requires the JAZ10 transcriptional repressor and that this effect may increase plant susceptibility to fungal infection in dense canopies.

Authors+Show Affiliations

Instituto de Investigaciones Fisiológicas y Ecológicas Vinculadas a la Agricultura, Consejo Nacional de Investigaciones Científicas y Técnicas, Universidad de Buenos Aires, C1417DSE Buenos Aires, Argentina.No affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

22371506

Citation

Cerrudo, Ignacio, et al. "Low Red/far-red Ratios Reduce Arabidopsis Resistance to Botrytis Cinerea and Jasmonate Responses Via a COI1-JAZ10-dependent, Salicylic Acid-independent Mechanism." Plant Physiology, vol. 158, no. 4, 2012, pp. 2042-52.
Cerrudo I, Keller MM, Cargnel MD, et al. Low red/far-red ratios reduce Arabidopsis resistance to Botrytis cinerea and jasmonate responses via a COI1-JAZ10-dependent, salicylic acid-independent mechanism. Plant Physiol. 2012;158(4):2042-52.
Cerrudo, I., Keller, M. M., Cargnel, M. D., Demkura, P. V., de Wit, M., Patitucci, M. S., Pierik, R., Pieterse, C. M., & Ballaré, C. L. (2012). Low red/far-red ratios reduce Arabidopsis resistance to Botrytis cinerea and jasmonate responses via a COI1-JAZ10-dependent, salicylic acid-independent mechanism. Plant Physiology, 158(4), 2042-52. https://doi.org/10.1104/pp.112.193359
Cerrudo I, et al. Low Red/far-red Ratios Reduce Arabidopsis Resistance to Botrytis Cinerea and Jasmonate Responses Via a COI1-JAZ10-dependent, Salicylic Acid-independent Mechanism. Plant Physiol. 2012;158(4):2042-52. PubMed PMID: 22371506.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Low red/far-red ratios reduce Arabidopsis resistance to Botrytis cinerea and jasmonate responses via a COI1-JAZ10-dependent, salicylic acid-independent mechanism. AU - Cerrudo,Ignacio, AU - Keller,Mercedes M, AU - Cargnel,Miriam D, AU - Demkura,Patricia V, AU - de Wit,Mieke, AU - Patitucci,Micaela S, AU - Pierik,Ronald, AU - Pieterse,Corné M J, AU - Ballaré,Carlos L, Y1 - 2012/02/27/ PY - 2012/2/29/entrez PY - 2012/3/1/pubmed PY - 2012/8/3/medline SP - 2042 EP - 52 JF - Plant physiology JO - Plant Physiol VL - 158 IS - 4 N2 - Light is an important modulator of plant immune responses. Here, we show that inactivation of the photoreceptor phytochrome B (phyB) by a low red/far-red ratio (R:FR), which is a signal of competition in plant canopies, down-regulates the expression of defense markers induced by the necrotrophic fungus Botrytis cinerea, including the genes that encode the transcription factor ETHYLENE RESPONSE FACTOR1 (ERF1) and the plant defensin PLANT DEFENSIN1.2 (PDF1.2). This effect of low R:FR correlated with a reduced sensitivity to jasmonate (JA), thus resembling the antagonistic effects of salicylic acid (SA) on JA responses. Low R:FR failed to depress PDF1.2 mRNA levels in a transgenic line in which PDF1.2 transcription was up-regulated by constitutive expression of ERF1 in a coronatine insensitive1 (coi1) mutant background (35S::ERF1/coi1). These results suggest that the low R:FR effect, in contrast to the SA effect, requires a functional SCFCOI1-JASMONATE ZIM-DOMAIN (JAZ) JA receptor module. Furthermore, the effect of low R:FR depressing the JA response was conserved in mutants impaired in SA signaling (sid2-1 and npr1-1). Plant exposure to low R:FR ratios and the phyB mutation markedly increased plant susceptibility to B. cinerea; the effect of low R:FR was (1) independent of the activation of the shade-avoidance syndrome, (2) conserved in the sid2-1 and npr1-1 mutants, and (3) absent in two RNA interference lines disrupted for the expression of the JAZ10 gene. Collectively, our results suggest that low R:FR ratios depress Arabidopsis (Arabidopsis thaliana) immune responses against necrotrophic microorganisms via a SA-independent mechanism that requires the JAZ10 transcriptional repressor and that this effect may increase plant susceptibility to fungal infection in dense canopies. SN - 1532-2548 UR - https://www.unboundmedicine.com/medline/citation/22371506/Low_red/far_red_ratios_reduce_Arabidopsis_resistance_to_Botrytis_cinerea_and_jasmonate_responses_via_a_COI1_JAZ10_dependent_salicylic_acid_independent_mechanism_ L2 - http://www.plantphysiol.org/lookup/pmidlookup?view=long&pmid=22371506 DB - PRIME DP - Unbound Medicine ER -