Genome-wide identification of jujube witches' broom phytoplasma effectors revealed the role of SJP3 in inducing phyllody
文献类型： 外文期刊
作者： Deng, Mingsheng 1 ; Ma, Fuli 1 ; Zhang, Xinyue 1 ; Huang, Jinqiu 1 ; Yang, Jian 1 ; Chen, Mengting 1 ; Zhou, Junyong 1 ; Sun, Qibao 2 ; Sun, Jun 1 ;
作者机构： 1.Anhui Agr Univ, Coll Hort, 130 West Changjiang Rd, Hefei 230006, Anhui, Peoples R China
2.Anhui Acad Agr Sci, Hort Res Inst, 40 South Nongke Rd, Hefei 230031, Anhui, Peoples R China
3.Anhui Agr Univ, State Key Lab Tea Plant Biol & Utilizat, 130 West Changjiang Rd, Hefei 230006, Anhui, Peoples R China
关键词： Ziziphus jujuba; 'Candidatus Phytoplasma ziziphi'; Phytoplasma effectors; MADS-box genes; Floral organ development
期刊名称：SCIENTIA HORTICULTURAE （ 影响因子：4.342； 五年影响因子：4.342 ）
ISSN： 0304-4238
年卷期： 2021 年 290 卷
页码：
收录情况： SCI
摘要： Jujube witches' broom (JWB), associated with 'Candidatus Phytoplasma ziziphi', is a devastating disease in Chinese jujube (Ziziphus jujuba Mill.). One of the symptoms in plants infected with phytoplasmas is the change of floral organs into leaf-like structures, known as phyllody. Effector proteins secreted by phytoplasmas are key to inducing this and other witches' broom symptoms. However, the phytoplasma effector proteins that induce phyllody in jujube remain unknown. We identified 43 candidate secreted JWB phytoplasma proteins (SJPs) in the JWB phytoplasma genome. Eight of the predicted candidate effector genes exhibited high transcript levels in infected flower buds. Among the eight candidate effectors, SJP3 experimentally showed the potential to induce phyllody. SJP3 expression in infected jujube was at a high level in young leaves and flowers. Ectopic expression of SJP3 in Arabidopsis induced leaf-like flowers and extra secondary flowers and significantly changed the transcript levels of PISTILLATA (PI), SHORT VEGETATIVE PHASE (SVP), AGAMOUS-LIKE 24 (AGL24) and SUPPRESSOR OF OVEREXPRESSION OF CONSTANS 1 (SOC1). The expression levels of these MADS-box ho-mologous genes were also changed in infected jujube flower buds and all four whorls of the floral organs. The data showed that the effector SJP3 disrupts expression of several MADS-box genes associated with floral organ identity and flowering time and is likely key to inducing phyllody in phytoplasma-infected jujube. This study provides new insight into understanding the pathogenesis of JWB disease induced by phytoplasma.
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