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Plant Signal Behav. 2019;14(8):1622982. doi: 10.1080/15592324.2019.1622982. Epub 2019 May 27.

Biogenesis of leaf endoplasmic reticulum body is regulated by both jasmonate-dependent and independent pathways.

Author information

1
a Graduate School of Science , Kyoto University , Kyoto , Japan.
2
b Malopolska Center of Biotechnology , Jagiellonian University , Kraków , Poland.
3
c Graduate School of Science and Technology , Nara Institute of Science and Technology , Ikoma , Japan.
4
d Department of Environmental and Life Sciences , University of Shizuoka , Shizuoka , Japan.
5
e Faculty of Science and Engineering , Konan University , Kobe , Japan.

Abstract

Endoplasmic reticulum (ER) bodies are thought to function in plant defense against insects and pathogens. Recently, a new type of ER body referred to as "leaf ER bodies" (L-ER bodies) was identified in Arabidopsis rosette leaves. L-ER bodies accumulate two β-glucosidases, namely PYK10 and BGLU18, which are characteristic of previously described constitutive ER bodies and inducible ER bodies, respectively. However, it is unclear how the biogenesis of L-ER bodies, which are similar to both constitutive and inducible ER bodies, is regulated. In the present study, we show that the biogenesis of L-ER bodies is regulated by both jasmonate (JA)-dependent and -independent pathways. Confocal imaging analysis revealed the presence of L-ER bodies in the JA insensitive mutant coronatine insensitive 1-1 (coi1-1), which lacks the JA receptor COI1. Quantitative reverse transcription polymerase chain reaction analysis revealed that the expression of BGLU18 mainly depends on the JA signaling pathway while that of PYK10 does not. In addition, expression of the ER body related genes NAI1, NAI2, and TSA1 was reduced in the coi1-1 mutant relative to the wild type. Taken together, these findings suggest that JA signaling is not necessary for the formation of L-ER bodies, while it is partially required for gene expression of L-ER body components.

KEYWORDS:

Arabidopsis thaliana; BGLU18; ER body; JA signaling; PYK10

PMID:
31132914
PMCID:
PMC6619926
[Available on 2020-05-27]
DOI:
10.1080/15592324.2019.1622982

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