ScAOC1 , an allene oxide cyclase gene , confers defense response to biotic and abiotic stresses in sugarcane
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ORIGINAL ARTICLE
ScAOC1, an allene oxide cyclase gene, confers defense response to biotic and abiotic stresses in sugarcane Tingting Sun1 · Guangli Cen1 · Chuihuai You2 · Wenyue Lou1 · Zhoutao Wang1 · Weihua Su1 · Wenju Wang1 · Damei Li1 · Youxiong Que1,3 · Yachun Su1,3 Received: 9 July 2020 / Accepted: 15 September 2020 © Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract Key message An allene oxide cyclase gene which is involved in defense against biotic and abiotic stresses was cloned and characterized in sugarcane. Abstract Allene oxide cyclase (AOC), a key enzyme in jasmonate acid (JA) biosynthesis, affects the stereoisomerism and biological activity of JA molecules, and plays an important role in plant stress resistance. In this study, four SsAOC alleles (SsAOC1–SsAOC4), which shared similar gene structure and were located on Chr1A, Chr1B, Chr1C, and Chr1D, respectively, were mined from sugarcane wild species Saccharum spontaneum, and a homologous gene ScAOC1 (GenBank Accession Number: MK674849) was cloned from sugarcane hybrid variety Yacheng05-179 inoculated with Sporisorium scitamineum for 48 h. ScAOC1 and SsAOC1–SsAOC4 were alkaline, unstable, hydrophilic, and non-secretory proteins, which possess the same set of conserved motifs and were clustered into one group in the phylogenetic analysis. ScAOC1 was expressed in all sugarcane tissues, but with different levels. After infection by S. scitamineum, the transcripts of ScAOC1 were increased significantly both in the smut-susceptible (ROC22) and resistant (Yacheng05-179) varieties, but its transcripts were more accumulated and lasted for a longer period in the smut-resistant variety than in the smut-susceptible one. ScAOC1 was down-regulated under MeJA and NaCl treatments, but up-regulated under SA, ABA, PEG, and cold stresses. Transiently overexpressing ScAOC1 gene into Nicotiana benthamiana leaves regulated the responses of N. benthamiana to two pathogens Ralstonia solanacearum and Fusarium solani var. coeruleum. Furthermore, prokaryotic expression analysis showed overexpression of ScAOC1 in Escherichia coli BL21 could enhance its tolerance to NaCl, mannitol, and cold stimuli. These results indicated that ScAOC1 may play an active role in response to biotic and abiotic stresses in sugarcane. Keywords Sugarcane · Allene oxide cyclase · Saccharum spontaneum · Biotic and abiotic stresses
Introduction
Communicated by Günther Hahne. Electronic supplementary material The online version of this article (https://doi.org/10.1007/s00299-020-02606-z) contains supplementary material, which is available to authorized users.
Jasmonates (JAs), including jasmonate acid (JA) and methyl jasmonate (MeJA), the important signal transduction molecules, play a vital role in plant growth and development, disease resistance, and abiotic stress tolerance (Conconi et al. 1996; Wani et al. 2016; Wasternack 2007; Wasternack
* Youxiong Que [email protected]
2
College of Life Sciences, Fujian Agriculture and Forestry University, Fuzhou 350002, Fuj
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