Long-day photoperiod enhances jasmonic acid-related plant defense

CAGNOLA, JUAN IGNACIO; CERDAN, PABLO D.; PACIN, MANUEL; ANDRADE, ANDREA; RODRIGUEZ, MARIA VERONICA; ZURBRIGGEN, MATIAS D.; LEGRIS, MARTINA; BUCHOVSKY, SABRINA; CARRILLO, NÉSTOR; CHORY, JOANNE; BLAZQUEZ, MIGUEL A.; ALABADI, DAVID; CASAL, JORGE JOSE

PLANT PHYSIOLOGY.

AMER SOC PLANT BIOLOGISTS

Año: 2018 p. 1 - 13

0032-0889

Agricultural crops are exposed to a range of daylengths, which act as important76 environmental cues for the control of developmental processes such as flowering. To77 explore the additional effects of daylength on plant function, we investigated the78 transcriptome of Arabidopsis plants grown under short days (SD) and transferred to79 long days (LD). Compared to that under SD, the LD transcriptome was enriched in80 genes involved in jasmonic acid-dependent systemic resistance. Many of these genes81 exhibited impaired expression induction under LD in the phytochrome A (phyA),82 cryptochrome 1 (cry1), and cry2 triple photoreceptor mutant. Compared to that under83 SD, LD enhanced plant resistance to the necrotrophic fungus Botrytis cinerea. This84 response was reduced in the phyA cry1 cry2 triple mutant, in the constitutive85 photomorphogenic 1 (cop1) mutant, in the myc2 mutant and in mutants impaired in86 DELLA function. Plants grown under SD had an increased nuclear abundance of COP187 and decreased DELLA abundance, the latter of which was dependent on COP1. We88 conclude that growth under LD enhances plant defense by reducing COP1 activity and89 enhancing DELLA abundance and MYC2 expression.90