Plants 2014, 3(1), 143-159; doi:10.3390/plants3010143
Article

Effects of Light and Wounding on Jasmonates in Rice phyAphyC Mutants

Received: 18 November 2013; in revised form: 18 February 2014 / Accepted: 24 February 2014 / Published: 3 March 2014
(This article belongs to the Special Issue Plant Light Signalling)
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Abstract: Jasmonates (JA) are lipid-derived plant hormones. They have been shown to be important regulators of photomorphogenesis, a developmental program in plants, which is activated by light through different red and blue light sensitive photoreceptors. In rice, inhibition of coleoptile growth by light is a central event in photomorphogenesis. This growth inhibition is impaired, when jasmonate biosynthesis is knocked out. Previously, we found that JASMONATE RESISTANT 1 (OsJAR1) transcripts were not induced in the phytochrome (phy) mutant phyAphyC. Therefore, in the current study we investigated the regulation of JA and its highly bioactive derivative (+)-7-iso-jasmonoyl-L-isoleucine (JA-Ile), as well as the transcriptional regulation of several JA-dependent genes both in wild type and phyAphyC mutant. JA and JA-Ile levels increased in the mutant seedlings in response to blue light. However, in phyAphyC mutant leaves, which were continuously wounded, JA and JA-Ile levels were lower compared to those in the wild type. Hence, the mutation of phyA and phyC has differential effects on jasmonate levels depending on the tissue and developmental stage. Our results suggest that the contribution of JA-Ile to signaling during photomorphogenesis of rice is minor, as coleoptile phenotypes of phyAphyC mutants resemble those of jasmonate-deficient mutants despite the fact that induction by blue light leads to higher levels of JA-Ile compared to the wild type. We postulate that phyA and phyC could control the activity of specific enzymes metabolizing JA to active derivatives.
Keywords: Oryza sativa L.; jasmonate; jasmonate-isoleucine; JASMONATE RESISTANT 1; phytochrome; photomorphogenesis; mechanical wounding
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MDPI and ACS Style

Brendel, R.; Svyatyna, K.; Jikumaru, Y.; Reichelt, M.; Mithöfer, A.; Takano, M.; Kamiya, Y.; Nick, P.; Riemann, M. Effects of Light and Wounding on Jasmonates in Rice phyAphyC Mutants. Plants 2014, 3, 143-159.

AMA Style

Brendel R, Svyatyna K, Jikumaru Y, Reichelt M, Mithöfer A, Takano M, Kamiya Y, Nick P, Riemann M. Effects of Light and Wounding on Jasmonates in Rice phyAphyC Mutants. Plants. 2014; 3(1):143-159.

Chicago/Turabian Style

Brendel, Rita; Svyatyna, Katharina; Jikumaru, Yusuke; Reichelt, Michael; Mithöfer, Axel; Takano, Makoto; Kamiya, Yuji; Nick, Peter; Riemann, Michael. 2014. "Effects of Light and Wounding on Jasmonates in Rice phyAphyC Mutants." Plants 3, no. 1: 143-159.

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