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Karrikins enhance light responses during germination and seedling development in Arabidopsis thaliana

journal contribution
posted on 2023-05-18, 11:16 authored by Nelson, DC, Flematti, GR, Riseborough, J-A, Ghisalberti, EL, Dixon, KW, Steven SmithSteven Smith
Karrikins are a class of seed germination stimulants identified in smoke from wildfires. Microarray analysis of imbibed Arabidopsis thaliana seeds was performed to identify transcriptional responses to KAR1 before germination. A small set of genes that are regulated by KAR1, even when germination is prevented by the absence of gibberellin biosynthesis or light, were identified. Light-induced genes, putative HY5-binding targets, and ABRE-like promoter motifs were overrepresented among KAR1-up-regulated genes. KAR1 transiently induced the light signal transduction transcription factor genes HY5 and HYH. Germination of afterripened Arabidopsis seed was triggered at lower fluences of red light when treated with KAR1. Light-dependent cotyledon expansion and inhibition of hypocotyl elongation were enhanced in the presence of germination-active karrikins. HY5 is important for the Arabidopsis hypocotyl elongation, but not seed germination, response to karrikins. These results reveal a role for karrikins in priming light responses in the emerging seedling, and suggest that the influence of karrikins on postfire ecology may not be limited to germination recruitment.

History

Publication title

Proceedings of the National Academy of Sciences of The United States of America

Volume

107

Issue

15

Pagination

7095-7100

ISSN

0027-8424

Department/School

School of Natural Sciences

Publisher

Natl Acad Sciences

Place of publication

2101 Constitution Ave Nw, Washington, USA, Dc, 20418

Rights statement

© 2015 National Academy of Sciences.

Repository Status

  • Restricted

Socio-economic Objectives

Expanding knowledge in the biological sciences

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