Dataset Information

LlWRKY39 is involved in thermotolerance by activating LlMBF1c and interacting with LlCaM3 in lily (Lilium longiflorum).

ABSTRACT: WRKY transcription factors (TFs) are of great importance in plant responses to different abiotic stresses. However, research on their roles in the regulation of thermotolerance remains limited. Here, we investigated the function of LlWRKY39 in the thermotolerance of lily (Lilium longiflorum 'white heaven'). According to multiple alignment analyses, LlWRKY39 is in the WRKY IId subclass and contains a potential calmodulin (CaM)-binding domain. Further analysis has shown that LlCaM3 interacts with LlWRKY39 by binding to its CaM-binding domain, and this interaction depends on Ca²⁺. LlWRKY39 was induced by heat stress (HS), and the LlWRKY39-GFP fusion protein was detected in the nucleus. The thermotolerance of lily and Arabidopsis was increased with the ectopic overexpression of LlWRKY39. The expression of heat-related genes AtHSFA1, AtHSFA2, AtMBF1c, AtGolS1, AtDREB2A, AtWRKY39, and AtHSP101 was significantly elevated in transgenic Arabidopsis lines, which might have promoted an increase in thermotolerance. Then, the promoter of LlMBF1c was isolated from lily, and LlWRKY39 was found to bind to the conserved W-box element in its promoter to activate its activity, suggesting that LlWRKY39 is an upstream regulator of LlMBF1c. In addition, a dual-luciferase reporter assay showed that via protein interaction, LlCaM3 negatively affected LlWRKY39 in the transcriptional activation of LlMBF1c, which might be an important feedback regulation pathway to balance the LlWRKY39-mediated heat stress response (HSR). Collectively, these results imply that LlWRKY39 might participate in the HSR as an important regulator through Ca²⁺-CaM and multiprotein bridging factor pathways.

SUBMITTER: Ding L

PROVIDER: S-EPMC7862462 | biostudies-literature | 2021 Feb

REPOSITORIES: biostudies-literature

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LlWRKY39 is involved in thermotolerance by activating LlMBF1c and interacting with LlCaM3 in lily (Lilium longiflorum).

Ding Liping L Wu Ze Z Teng Renda R Xu Sujuan S Cao Xing X Yuan Guozhen G Zhang Dehua D Teng Nianjun N

Horticulture research 20210204 1

WRKY transcription factors (TFs) are of great importance in plant responses to different abiotic stresses. However, research on their roles in the regulation of thermotolerance remains limited. Here, we investigated the function of LlWRKY39 in the thermotolerance of lily (Lilium longiflorum 'white heaven'). According to multiple alignment analyses, LlWRKY39 is in the WRKY IId subclass and contains a potential calmodulin (CaM)-binding domain. Further analysis has shown that LlCaM3 interacts with ...[more]

PMID: 33542226

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Project description:In this study, two different hybrids of Easter lily (Lilium longiflorum), obtained from two cross combinations, along with their four parents were sequenced by high-throughput RNA-sequencing (RNA-Seq) to find out differentially expressed gene in parent-hybrid combinations. The leaf mRNA profiles of two hybrids and their four parents were RNA-sequenced with a view to identify the potential candidate genes related to plant height heterosis. In both cross combinations, based to morphological traits mid-parent heterosis (MPH) was higher than high-parent heterosis (HPH) for plant height, leaf length, and number of flowers whereas HPH was higher than MPH for flowering time. A total of 4,327 differentially expressed genes (DEGs) were identified through RNA-Seq between the hybrids and their parents based on fold changes (FC) ≥ 2 for up- and ≤ -2 for down-regulation. Venn diagram analysis revealed that there were 703 common DEGs in two hybrid combinations, those were either up- or down-regulated. Most of the commonly expressed DEGs exhibited higher non-additive effects especially overdominance (75.9%) rather than additive (19.4%) and dominance (4.76%) effects. Among the 384 functionally annotated DEGs identified through Blast2GO tool, 12 DEGs were up-regulated and 16 of them were down-regulated in a similar fashion in both hybrids as revealed by heat map analysis. These 28 universally expressed DEGs were found to encode different types of proteins and enzymes those might regulate heterosis by modulating growth, development and stress-related functions in lily. In addition, gene ontology (GO) analysis of 260 annotated DEGs revealed that biological process might play dominant role in heterotic expression. In this first report of transcriptome sequencing in Easter lily, the notable universally up-regulated DEGs annotated ABC transporter A family member-like, B3 domain-containing, disease resistance RPP13/1, auxin-responsive SAUR68-like, and vicilin-like antimicrobial peptides 2-2 proteins those were perhaps associated with plant height heterosis. The genes expressed universally due to their overdominace function perhaps influenced MPH for greater plant height- largely by modulating biological processes involved therein. The genes identified in this study might be exploited in heterosis breeding for plant height of L. longiflorum.

Dataset Information

LlWRKY39 is involved in thermotolerance by activating LlMBF1c and interacting with LlCaM3 in lily (Lilium longiflorum).

Publications

LlWRKY39 is involved in thermotolerance by activating LlMBF1c and interacting with LlCaM3 in lily (Lilium longiflorum).

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