Page 100 - 《广西植物》2025年第5期
P. 100
9 0 4 广 西 植 物 45 卷
( 1. Guangxi Subtropical Crops Research Instituteꎬ Nanning 530000ꎬ Chinaꎻ 2. Guangxi Key Laboratory
of Quality and Safety Control for Subtropical Fruitsꎬ Nanning 530000ꎬ China )
Abstract: The WRKY transcription factors family plays an important role in plant biological and abiotic stress responsesꎬ
a total of 61 WRKY gene family members of jackfruit (Artocarpus heterophyllus) were identified based on the whole
genome of jackfruitꎬ and the expression profile of WRKY gene family members in jackfruit under low temperature stress
were analyzed by bioinformatics method and quantitative real ̄time fluorescence PCR (qRT ̄PCR). The results were as
follows: (1) Phylogenetic tree analysis showed that WRKY gene family members of jackfruitꎬ Arabidopsis thaliana and
rice (Oryza sativa) were divided into four subfamilies. (2) Chromosome localization results showed that 61 AhWRKY
gene family members were unevenly distributed on 23 chromosomes. (3) Analyses of conserved motifs and gene structure
showed that AhWRKY gene family members located in the same subfamily had similar conserved motifs and gene
structure. (4) Phylogenetic analysis revealed 124 pairs of fragment duplicated genes within AhWRKY gene family
membersꎻ inter ̄species analysis showed that jackfruit exhibited a greater number of homologous gene pairs with
Arabidopsis thaliana than rice and fig (Ficus carica)ꎻ while there were fewer homologous gene pairs between rice and
figꎬ with only eight genes forming homologous gene pairs among the three species. (5) Transcriptomic analysis of
different varieties of jackfruit under low temperature stress showed that the expression patterns of WRKY gene family
members differed in different varieties. Moreoverꎬ qRT ̄PCR analysis further verified this resultꎬ indicating that WRKY
gene family members played an important role in response to low temperature stress in jackfruit of different varieties. This
study provides new insights into the evolution and function of WRKY gene family membersꎬ and lays a foundation for
functional research and utilization of WRKY gene family members in jackfruit.
Key words: jackfruitꎬ WRKY gene familyꎬ low temperature stressꎬ expression patternꎬ bioinformatics analysis
高等植物通过调控内部信号通路和网络来响 胁迫反应ꎬ并在植物响应低温胁迫的过程中发挥
应外界胁迫ꎬ而这些信号通路和网络由转录因子 重要 作 用ꎮ 例 如ꎬ在 马 鞭 草 ( Verbena bonariensis)
(transcriptional factorsꎬ TF) 协调完成( Jiang et al.ꎬ 中ꎬVbWRKY32 作为正调节因子ꎬ上调低温胁迫相
2015)ꎮ WRKY 转录因子家族是植物中最大的转录 关基因的转录水平ꎬ并提高马鞭草的抗氧化能力ꎬ
因子家族之一ꎬ在生物和非生物胁迫响应过程中 维持膜稳定性ꎬ增强渗透调节能力ꎬ从而提高马鞭
起着关键作用( Rushton et al.ꎬ 2010)ꎮ WRKY 蛋 草在低温胁迫下的生存能力(Wang et al.ꎬ 2020)ꎮ
白是包含特殊结构域的转录因子ꎬ由于其 N 末端 紫菜薹(Brassica campestris)WRKY46 基因同时响应
结构 域 ( N ̄terminal domainꎬ NTD ) 具 有 保 守 的 低温胁迫和脱落酸( abscisic acidꎬ ABA) 的调节ꎬ
WRKYGQK 氨基酸核心序列ꎬ因此被称为 WRKY 激活 ABA 信号通路中相关基因的表达ꎬ并提高紫
蛋白( Chen et al.ꎬ 2012)ꎮ WRKY 蛋白通过结合 菜薹的低温耐受性( Wang F et al.ꎬ 2012)ꎮ 黄瓜
启动子中的 W ̄box 基序( TTGACC / T) 来调节下游 (Cucumis sativus) WRKY 基因家族成员 CsWRKY46
基因的表达ꎬ根据 WRKY 蛋白的序列特征可将其 在冷胁迫和 ABA 处理下表达上调且 CsWRKY46 仅
分为 3 组ꎬ即第 1 组含有 2 个 WRKY 结构域ꎬ第 2 在细胞核中表达ꎬ与 ABI5 启动子中的 W ̄box 相互
组和第 3 组均含有 1 个 WRKY 结构域ꎮ 然而ꎬⅡ 作用(Ling et al.ꎬ 2011)ꎮ 同时ꎬ过表达 CsWRKY46
族蛋白的羧基末端( C ̄terminal) 含有 C2H2( C ̄X4 ̄ 在拟南芥冷冻处理后幼苗成活率高且活性氧相关
5 ̄C ̄X22 ̄23 ̄H ̄X1 ̄H)的锌指结构ꎬⅢ族具有 C2HC 指标脯氨酸含量升高ꎬ相对电解质含量降低ꎬ丙二
(C ̄X7 ̄C ̄X23 ̄H ̄X1 ̄C)的锌指结构ꎮ 根据系统发 醛含量降低( Zhang et al.ꎬ 2016)ꎮ 在水稻( Oryza
育关系ꎬⅡ族蛋白可进一步分为 5 个亚群ꎬ即Ⅱ a、 sativa) WRKY 家族中大部分( 54 / 103) OsWRKY 基
Ⅱ b、Ⅱ c、Ⅱ d 和Ⅱ e( Eulgem et al.ꎬ 2000ꎻ Jiang 因在盐胁迫、干旱胁迫和低温胁迫处理后表达水
et al.ꎬ 2017)ꎮ 平发生显著变化( Ramamoorthy et al.ꎬ 2008)ꎮ 玉
低温胁迫影响植物生长发育过程ꎬ而 WRKY 米(Zea mays)ZmWRKY33 响应高盐、脱水、低温和
基因家族成员通过不同的信号转导途径参与低温 ABA 等非生物胁迫且过表达 ZmWRKY33 可增强

