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石榴F3’H全基因组分析及其在籽粒花色苷合成中的作用

2024-06-30陈延惠曹新悦冯志良谭彬胡悦张海朋简在海孟海军冯建灿万然胡青霞

果树学报 2024年6期
关键词:石榴籽粒颜色

陈延惠 曹新悦 冯志良 谭彬 胡悦 张海朋 简在海 孟海军 冯建灿 万然 胡青霞

摘    要:【目的】对石榴PgF3H进行全基因组鉴定,了解其成员大小、位置、结构、系统发育关系及顺式作用元件等相关信息,分析PgF3H在石榴籽粒花色苷合成中的作用。【方法】通过生物信息学分析结合转录组数据了解石榴PgF3H基因家族成员,分析其在不同品种石榴籽粒中随发育期的表达情况,并通过农杆菌介导拟南芥异源转化试验验证PgF3H3的功能。【结果】鉴定到的3个PgF3H成员均含有保守结构域CYP75B,具有比较保守的基因结构;对它们的顺式作用元件和表达情况进行分析,表明PgF3H2和PgF3H可能受光和激素调节,由MYB转录调控其表达,在石榴籽粒花色苷合成中发挥重要作用;初步验证了PgF3H3的功能。【结论】鉴定了石榴3个PgF3H基因成员,明确了PgF3H2和PgF3H3是与籽粒着色有关的重要候选基因,验证了PgF3H3调控花色苷合成的功能。

关键词:石榴;F3H;籽粒;花色苷;颜色

中图分类号:S665.4 文献标志码:A 文章编号:1009-9980(2024)06-1064-14

Genome-wide analysis of the pomegranate F3H family and their roles in aril anthocyanin biosynthesis

CHEN Yanhui1, 2, 3, CAO Xinyue 1, 2, 3#, FENG Zhiliang 1, 2, 3, TAN Bin1, 2, 3, HU Yue4, ZHANG Haipeng1, 2, 3, JIAN Zaihai1, 2, 3, MENG Haijun1, 2, 3, FENG Jiancan1, 2, 3, WAN Ran1, 2, 3*, HU Qingxia1, 2, 3*

(1College of Horticulture, Henan Agriculture University, Zhengzhou 450002, Henan, China; 2Henan Laboratory of Fruit and Cucurbit Biology, Zhengzhou 450002, Henan, China; 3International Joint Laboratory of Henan Horticultural Crop Biology, Zhengzhou 450002, Henan, China; 4Dengfeng Branch of Agricultural Bank of China, Dengfeng 452470, Henan, China)

Abstract: 【Objective】 Anthocyanins are important substance basis of coloration and intrinsic nutritional quality in Pomegranate (Punica granatum L.). Studies about anthocyanin associated genes in pomegranate are very important. F3H is an important kind of key enzymes in anthocyanin biosynthesis pathways. However, the role of PgF3H in aril anthocyanin biosynthesis is little known. This study introduced the PgF3H gene family information in the whole pomegranate genome, for example, length, location, gene structure, cis- elements in promoters, and analysis of their potential roles in anthocyanin biosynthesis and coloration of pomegranate arils. 【Methods】 The genome of the Tunisian soft seed pomegranate (PRJNA355913) download from NCBI was used to identify the PgF3H gene family. Their chromosomal distributions, sequences and structures, and phylogenetic relationships as well as cis-elements in promoters were analyzed through bioinformatics. Furthermore, the transcriptional expression of the PgF3Hs based on the transcriptomic data from the arils of three pomegranate cultivars (Tunisian soft seed with red color arils, Meilisuan with dark red color and Zimei with purple red color arils) at different developental stages were analyzed to explore the possible roles of the PgF3Hs in aril anthocyanin biosynthesis and coloration. The Agrobacterium mediated- heterogenous transformation in Arabidopsis was used to determine the PgF3H3 function. 【Results】 Three PgF3H genes in pomegranate were identified, which were renamed PgF3H1, PgF3H2 and PgF3H3. Their sequences were 2055-3933 bp, their proteins contain 208-280 amino acids. The 2D and 3D protein structures were predicted, primarily with α helices and random coils. The three PgF3Hs together with 44 F3H genes from other plant species were used to construct the phylogenetic tree. The results showed that the PgF3H3/AtF3H were orthologs and clustered in Group Ⅱ, while the PgF3H1/PgF3H2 were paralogues and clustered in Group Ⅲ. Moreover, the PgF3H1/PgF3H2 had a comparatively close distance to the FoF3H (Flos osmanthi Fragrantis) and the OsF3H2/OsF3H3 (Oryza sativa). Bioinformatic analysis showed that the PgF3Hs had conservative structures with 1-10 motifs with a similar order, and conserved function domain CYP75B. Furthermore, all of the PgF3H genes contained five kinds of cis- elements on their promoter regions, including growth and development, light, MYB, hormone and stress. The PgF3H2 and PgF3H3 promoters had 29 and 24 cis-elements, respectively, which were much more than those of the PgF3H1. This possibly implied that they had more important and active roles than PgF3H1. Remarkably, there were 4 TGAACG-boxes and 4 CGTCA-boxes related to growth and development, and 4 AUX associated cis- elements on the PgF3H2 promoter, whereas the PgF3H3 promoter contained 5 G-boxes related to response to light and 6 ABA associated cis- elements. Moreover, all of the 3 PgF3H genes had at least one MYB transcription factor binding sites. Subsequently, the transcriptomic data of different color arils from Tunisian soft seed and Meilisuan at the five developmental stages and Zimei at the three developmental stages were used to investigate the PgF3H expression patterns. The results indicated that each PgF3H showed similar expression trends in the three kinds of arils during fruit development. The PgF3H1 displayed an extremely low transcriptional level all the time in each kind of arils, indicating that it might have little implication in anthocyanin biosynthesis and coloration of the pomegranate arils. The expression levels of the PgF3H3 was dominantly increased before fruit expanding period, indicating that the PgF3H3 might be responsible for aril coloration at early stages of fruit development. Noticeably, the PgF3H2 with quite high expression levels in each kind of arils during development showed two increasing leaps at the turning and ripening stage. Therefore, the PgF3H2 and PgF3H3 might be much contributed to the anthocyanin biosynthesis and coloration of the pomegranate arils. Combined the results above, the PgF3H2 and PgF3H3 possibly were regulated by light and hormones, were speculated to play important roles in the anthocyanin biosynthesis and coloration in pomegranate. Finally, the PgF3H3 was cloned and showed a relative high similarity with the VvF3H (Vitis vinifera L.) and the MdF3H (Malus domestica). The PgF3H3 was then transformed into Arabidopsis todemonstrate its function of regulating anthocyanin biosynthesis and coloration. The young lines of the PgF3H3 over-expressed Arabidopsis had red cotyledons with the average anthocyanin level of 0.308 3 mg·g-1, however, the young WT lines showed a green color with no detection of anthocyanins. Also, the carotenoid and chlorophyll contents were significantly lower in the PgF3H3 over-expression lines than those of the WT. 【Conclusion】 The three identified PgF3H genes all had the conserved function domain CYP75B and conserved gene structures. The PgF3H2 and PgF3H3 might play important roles in anthocyanin biosynthesis and coloration of pomegranate arils, and their expression might be regulated by light and hormone. The PgF3H3 was suggested to be involved in aril coloration before fruit expansion, whereas, the PgF3H2 was probably implicated in continuous coloration of arils. Furthermore, the function of the PgF3H3 in regulating anthocyanin biosynthesis and coloration was primarily determined by heterogenous transformation. This study deepened the understanding of anthocyanin biosynthesis and coloration mechanism in pomegranate arils, and also supplied important basis for pomegranate color improvement.

Key words: Pomegranate; F3H; Arils; Anthocyanin; Coloration

石榴(Punica granatum L.)属于千屈菜科(Lythraceae)石榴属(Punica)植物,在中国有2000余年栽培历史,味好、色美、富含营养和生物活性物质,备受消费者喜爱。石榴产业已发展为中国云南、四川和河南等地脱贫攻坚和乡村振兴的支柱产业[1-3]。颜色是影响石榴果实品质和观赏价值的重要性状[4]。花色苷是一种广泛存在于植物体中的天然水溶性色素,决定了石榴叶片、花器官[5]、果实及果汁色泽呈白色到深红色甚至紫黑色等颜色特征[6-8];同时花色苷也是一类被熟知的抗氧化活性物质,其含量是石榴果实品质及工业加工价值的重要指示性状[5,9],因此,花色苷合成和颜色形成研究对石榴品种改良和新品种培育意义重大。

石榴花色苷主要有飞燕草-3-葡萄糖苷、飞燕草-3,5-葡萄糖苷和矢车菊-3-葡萄糖苷等[10-11],其形成与积累因组织器官、品种和地源等不同存在一定变异。总体上,泰山红[5,7-8]、突尼斯软籽[1,8]和墨石榴[7]等红色、深红色系石榴品种果实花色苷含量随发育成熟期呈上升趋势,相比之下,三白和泰山三白甜等浅或白色系石榴品种果实花色苷含量较低,而水晶甜果皮中不含花青苷[12-15]。榴花红色石榴盛花期花瓣颜色较榴花粉色和榴花白色红艳,其花色苷含量及其合成相关酶类活性均高于后者花瓣[16]。突尼斯软籽石榴是中国流行栽培、品质优良的软籽石榴品种,其果实色泽、花色苷含量在云贵高原产区均优于河南等北方产区[6,17-18]。豫大籽和突尼斯软籽石榴杂种后代幼叶颜色表现绿色、黄绿、红和深红性状分离,这与其花色苷、叶绿素含量及其比值有关[19-20]。这些研究基础为石榴色泽形成的分子机制研究提供了重要支撑。

植物花色苷通常经苯丙氨酸解氨酶(PAL)、查尔酮合成酶(CHS)、二氢黄酮醇3-羟化酶(F3H)、二氢黄酮醇4-还原酶(DFR)和花色素苷合酶(ANS)等一系列苯丙烷代谢途径相关酶作用,再由糖基转移酶(UGT)等催化与不同单糖结合形成,该生物过程主要受MYB、bHLH、WD40等转录因子调控[5,21]。随着石榴基因组信息的公布,相继克隆了PgMYB[11]、PgbZIP[11]、PgDFR[14]、PgANS[14]、PgUGT[22]和PgCHS等与石榴花色苷合成及红色形成相关的基因,并分析了其序列与表达情况[15,23-25]。矢车菊素是石榴中主要的花色苷种类之一,F3H是合成矢车菊素的重要限速酶。Yuan等[26]及Harel-beja等[15]通过多组学分析发现石榴果皮着色过程中PgF3H基因表达上调,但人们对石榴PgF3H基因家族成员的数目、大小、结构和系统发育等基本信息尚不了解,它们在石榴籽粒着色过程中的表达情况及其功能并不清楚。因此,笔者在本研究中对石榴PgF3H基因家族成员进行了全基因组鉴定和分析,介绍了其长度、大小、结构、系统发育,分析了其顺式作用元件情况,并通过已有转录组数据分析了石榴PgF3H基因家族成员在石榴籽粒着色中的可能作用。

F3H属于P450细胞色素单加氧酶,主要负责在类黄酮分子B环上C位基团上加第二个羟基[15,27-28]。Nitarska等[29]通过DNA基因编辑技术获得一品红(Euphorbia pulcherrima Willd. et Kl.)Christmas EveEpF3H敲除株系,其矢车菊素含量下降,红色变浅,验证了该基因在矢车菊花色苷合成中的重要作用。在葡萄(Vitis vinifera L.)中鉴定出1个VvF3H基因,VvF3H1表达量在红色浆果中持续显著高于绿色浆果[28,30]。在苹果(Malus domestica)中鉴定出2个MdF3H基因[31]。草莓(Fragaria × ananassa Duch.)FaF3H受FaMYB5正调控参与果实红色色泽形成[32]。由此可见,F3H广泛参与了植物花、种皮和果实着色。然而,截止到目前石榴PgF3H基因家族成员调控花色苷合成的功能并不明确,因此,笔者在本研究中进一步克隆了石榴PgF3H基因家族成员中PgF3H3基因,并初步验证了其调控花色苷合成的功能。研究结果有助于加深对石榴色泽形成分子机制的理解,也为石榴品种色泽改良提供了重要理论依据。

1 材料和方法

1.1 试验材料

采集河南省郑州市毛庄果园的突尼斯软籽自交F1代深红色株系叶片,用于克隆PgF3H3基因。用于基因功能验证的拟南芥(Arabidopsis thaliana,ecotype Columbia)分别为野生型植株(WT)和PgF3H3过表达植株(OE),均种植于实验室植物培养间,培养条件为温度26 ℃、16 h/8 h光照/黑暗交替、湿度75%~85%。采集健康、发育相对一致的种植于河南省荥阳市的石榴品种突尼斯软籽(TS,籽粒呈浅红色)和美丽酸(MLS,籽粒呈深红色)的坐果期、幼果期、转色期、膨大期和成熟期果实籽粒,以及种植于四川省攀枝花市石榴品种紫美(ZM,籽粒呈紫红色)幼果期、转色期和成熟期果实籽粒(图1),用于PgF3H基因家族成员表达分析。

1.2 试验方法

1.2.1 石榴PgF3H基因家族成员鉴定 从NCBI数据库(https://www.ncbi.nlm.nih.gov/assembly/GCF_007655135.1)中检索并下载突尼斯软籽石榴基因组数据(PRJNA355913)。从Ensemble Plants数据库(http://plants.ensembl.org/index.html)获得水稻(Oryzasativa)OsF3H序列,通过BLASTP工具进行双向blast比对筛选获得PgF3H候选基因。利用NCBI CDD数据库(Conserved Domain Database;http://www.ncbi.nlm.nih.gov//Structure/bwrpsb/bwrpsb.cgi)对候选PgF3H基因进行保守结构域分析,最终确定石榴PgF3H基因家族的成员。利用石榴基因组注释文件(https://www.ncbi.nlm.nih.gov/)分析PgF3H基因家族成员在染色体上的位置,并依次对各成员进行重命名,利用TBtools工具进行可视化作图。使用TBtools工具分析石榴PgF3H基因家族编码蛋白的理化性质,包括分子质量、等电点、氨基酸数量、不稳定系数和亲水指数。利用Cell-PLoc 2.0(http://www.csbio.sjtu.edu.cn/bioinf/Cell-PLoc-2/)对PgF3H基因家族编码蛋白亚细胞定位进行预测分析。利用SOPMA(https://npsa-pbil.ibcp.fr/cgi-bin/npsa_automat.pl?page=npsa_sopma.html)和SWISS-MODEL(https://swissmodel.expasy.org/)对PgF3H基因家族成员编码蛋白质的二级结构和三级结构进行预测。

1.2.2 石榴PgF3H基因的系统发育、分类、保守基序和基因结构分析 使用MEGA11软件,根据最大似然方法(maximum likelihood,ML),Bootstrap检验重复次数为1000次,其他参数设定为默认,对拟南芥、水稻等单子叶植物和葡萄、苹果等双子叶植物中共47个F3H全长蛋白序列构建系统发育树。利用MEME(https://meme-suite.org/meme/tools/meme)在线数据库分析PgF3H蛋白保守基序,使用TBtools将外显子-内含子结构进行可视化。

1.2.3 石榴PgF3H基因启动子顺式作用元件分析 使用TBtools提取石榴PgF3H基因上游2000 bp的启动子区序列信息;使用PlantCARE(http://bioinformatics.psb.ugent.be/webtools/plantcare/html/)在线工具预测分析PgF3H基因启动子区顺式元件,然后使用TBtools工具将结果可视化。

1.2.4 石榴PgF3H家族基因表达分析 提取不同发育期突尼斯软籽、美丽酸和紫美石榴果实籽粒RNA,设置3次重复,转录组测序委托武汉迈特维尔生物科技有限公司完成,从转录组数据中提取PgF3H基因家族成员在不同品种不同发育期籽粒样品中的表达信息,使用TBtools生成热图。

1.2.5 石榴PgF3H3基因克隆及序列分析 利用RNA提取试剂盒(上海生工B518631-0100)提取突尼斯软籽石榴自交F1代深红色株系叶片总RNA,利用RNA反转录试剂盒(南京诺唯赞R233-01)获得cDNA。参考石榴基因组PRJNA355913,使用Primer5.0设计PgF3H基因引物(F:ATGGACTCTCTCCCCTTCTTCCTGGC;R:TCAATAAACATGTCGCGGCAGCCTC),从上述cDNA中克隆PgF3H3基因。利用DNAMAN软件和NCBIBlast对PgF3H3和草莓(Fragaria × ananassa)、樱桃(Prunus avium)、苹果(Malus domestica)和葡萄(Vitis vinifera)F3H进行多序列比对分析,使用MEGA11.0软件构建系统发育树。

1.2.6 石榴PgF3H3基因功能验证 构建PgF3H3基因过表达载体pSAK277:PgF3H3,将重组质粒pSAK277:PgF3H3转化入农杆菌EHA105中。然后,利用农杆菌侵染转化方法[11]转化野生型-哥伦比亚拟南芥(WT),经50 mg·L-1 Kan筛选获得转化株系,提取转化株系和WT株系叶片总DNA,通过PCR鉴定后获得稳定遗传的拟南芥过表达PgF3H3株系(OE)。参考万然等[20]和胡悦[33]的方法,采用pH示差法检测OE和WT(14 d)子叶中花色苷含量,采用石油醚方法检测其类胡萝卜素含量,采用分光光度计法检测其叶绿素含量;每个样品重复检测3次。

1.2.7 数据处理及分析 用Microsoft Excel 2016对数据进行整理,用SPSS 19.0软件对数据进行方差分析和多重比较(Duncans test,显著水平p=0.05)。

2 结果与分析

2.1 石榴PgF3H基因家族成员鉴定

从突尼斯软籽石榴基因组中共鉴别到3个PgF3H基因家族成员,根据它们在染色体上的位置,按照顺序依次将其重命名为PgF3H1、PgF3H2、PgF3H3,它们分别位于LG0、LG0和LG6上,序列长度分别为2055、3933、2606 bp(表1)。这3个PgF3H基因编码蛋白所含氨基酸数目分别为520、580和508个,其相对分子质量分别为58.3、66.2和56.4 kDa,它们均为碱性、亲水性蛋白,另外,PgF3H1、PgF3H2蛋白质稳定性较PgF3H3更好。经亚细胞定位预测分析,发现PgF3H1、PgF3H2和PgF3H3蛋白均可能定位于内质网发挥作用(表1)。蛋白结构预测分析表明,PgF3H蛋白以α-螺旋和无规则卷曲为主,占比80%以上,其次为延伸链和β-折叠(表2,图2)。以上这些结果为进一步研究PgF3H蛋白的纯化、活性和功能提供了理论依据。

2.2 石榴PgF3H基因家族成员系统发育分析

为了揭示石榴PgF3Hs与其他植物F3Hs的进化关系,将节节麦和水稻2种单子叶植物以及拟南芥、葡萄、苹果、桃等31种双子叶植物共47个F3H共同用于构建系统发育树。系统发育分析表明,GmF3H蛋白位于系统进化树末端单独一分支上,形成单独的一个亚族,即Group Ⅴ;剩余39个植物F3H蛋白被划分为4个亚族,即Group Ⅰ、Ⅱ、Ⅲ、Ⅳ(图3)。由进化树可推知,在植物F3H蛋白进化树末端分支上,存在11对同源基因,其中10对属于直系同源基因,5对属于旁系同源基因;旁系同源基因包括OsF3H4/OsF3H5、AtaF3H2/AtaF3H3、PgF3H1/PgF3H2、OsF3H2/OsF3H3和IbF3H1/OsF3H2等,它们起源于物种特异的基因复制扩增;直系同源基因包括OsF3H1/AtaF3H1、TcF3H/GbF3H、VaF3H/VvF3H、AtF3H/PgF3H3、MdF3H2/PpyF3H1和IbF3H1/OsF3H2等等,它们起源于物种分化事件(图3)。此外,F3H基因数量在两个及以上的物种有水稻、石榴、苹果、番薯和节节麦等7个,其中只有水稻和石榴F3H基因聚类到不同的亚族,PgF3H1/PgF3H2与FoF3H、OsF3H2/OsF3H3同源,聚到Group Ⅲ,而PgF3H3与AtF3H同源,聚到Group Ⅱ;其余同一物种内的F3H基因均在同一亚族(图3)。

2.3 PgF3H基因的保守基序和基因结构分析

利用MEME在线工具对PgF3H基因的保守基序(motif)及保守结构域进行了分析(图4)。结果表明,PgF3H基因结构保守,除了PgF3H3没有motif 7和motif 8以外,PgF3H1、PgF3H2和PgF3H3基因均含有motif 1~10,一般一个基因中一种motif都只有1个;它们从5端到3端均依次分布motif 10、motif 5、motif 2、motif 7(除PgF3H3)、motif 6、motif 8(除PgF3H3)、motif 4、motif 1、motif 3和motif 9;根据基序编码氨基酸序列显示出3个PgF3H蛋白间的保守性与变异性,每个堆叠高度越高代表此处序列越高保守,每个氨基酸符号的高度代表它在此位点出现的频率(图4-A、C)。此外,PgF3H基因均含有典型的CYP75B结构域,并具有4~5个内含子(图4-B)。这些关于基因结构分析的结果表明了PgF3H基因的保守性。

2.4 石榴PgF3H基因启动子顺式作用元件(cis-elements)分析

花色苷合成是植物生长发育和抗逆反应的重要生物学过程。通过顺式作用元件分析,发现PgF3H基因家族成员的启动子区均分布有生长发育相关元件、光响应元件、MYB相关元件、激素响应元件和应激反应元件(图5)。PgF3H1基因启动子区含有16个不同的顺式作用元件,其中有6种激素响应元件各1个以及1个MYB转录因子结合位点CCAAT-box。PgF3H2基因启动子区具有最多的顺式作用元件,共29个,分别包括9个生长发育相关元件(其中有4个TGACG-motif和4个CGTCA-motif);8个光响应元件(其中有2个G-box和2个TCT-box);9个激素响应元件[其中有3个ABRE(脱落酸ABA)和4个TGA-element(生长素AUX)];以及1个MYB转录因子结合位点(MBS)和2个应激反应元件(图5)。PgF3H3基因启动子区分别含有9个光响应元件(其中有5个G-box);8个激素响应元件(其中有6个ABRE);4个生长发育相关元件(其中2个TGACG-motif和2个CGTCA-motif);1个MYB转录因子结合位点(MBS)和2个应激反应元件(ARE)(图5)。

2.5 PgF3H基因在不同颜色石榴籽粒着色过程中的表达分析

为了进一步了解PgF3H基因在石榴果实籽粒着色及花色苷积累中的作用,从已有的突尼斯软籽、美丽酸和紫美在不同发育期的籽粒样品转录组数据中,获得PgF3H1、PgF3H2和PgF3H3的表达情况(图6)。结果表明,在这3个石榴品种中,PgF3H1基因的表达量始终处于较低水平,说明该基因可能与石榴籽粒着色关系不大;相比而言,PgF3H2和PgF3H3具有更高的表达水平;此外,随果实发育和籽粒着色,PgF3H2和PgF3H3均在不同石榴品种中表现出相似的表达趋势,这说明它们与石榴籽粒着色有重要关系。

PgF3H2在这3个石榴品种籽粒中均呈显著上调表达趋势,其表达水平在幼果期之前极低且无显著变化;此后开始快速大幅上升,至转色期分别显著增加了11 616.68%、9 381.51%和10 942.06%;然后,其表达水平继续显著上调表达,至成熟期又分别增加了254.98%、602.27%和198.76%(图6)。PgF3H3在坐果期突尼斯软籽、美丽酸和紫美籽粒中即已转录表达,至转色期其表达水平分别提高了271.41%、138.70%和793.05%;不过,PgF3H3在突尼斯软籽二次膨大期籽粒中未继续上调表达,到成熟期反而下降了38.84%;在美丽酸中却持续小幅上调表达,至成熟期其表达水平又提高了48.76%;另外,PgF3H3在紫美籽粒中至转色期其表达水平提高了793.05%,至成熟期又下降了38.84%。此外,至成熟期时,在这3个石榴品种籽粒中,PgF3H2的表达量均显著高于PgF3H3。比较分析以上研究结果说明,PgF3H3可能主要作用于石榴籽粒早期花色苷合成和颜色形成,而PgF3H2可能是石榴成熟籽粒花色苷合成和呈色的主要作用基因。

2.6 PgF3H3基因克隆及功能验证

笔者课题组前期研究已发现,突尼斯软籽石榴自交1代植株幼叶红色深浅与其花色苷含量呈正相关[20],PgF3H3表达量随着幼叶颜色由红转绿而逐渐下降[20]。故PgF3H3可能与石榴器官发育前期着色有关。因此克隆了PgF3H3基因,并对PgF3H3、VvF3H、FaF3H、CaF3H和MdF3H等不同园艺作物中F3H蛋白进行了多序列比对分析,结果发现PgF3H3与VvF3H和MdF3H相似度较高(75%左右)(图7-A)。

为了探明PgF3H3在调控石榴花色苷合成方面的功能,通过农杆菌介导的遗传转化技术,成功获得PgF3H3过表达拟南芥植株,该基因被稳定整合到拟南芥基因组中,表达量显著高于野生型(图7-B~D)。根据表型观察,发现野生型植株幼苗子叶呈现绿色,PgF3H3过表达拟南芥植株幼苗子叶呈现红色(图7-B)。通过检测花色苷、类胡萝卜素和叶绿素含量,发现PgF3H3过表达拟南芥子叶中花色苷含量为0.308 3 mg·g-1,然而在野生型子叶中未检测到花色苷,此外,其类胡萝卜素和叶绿素含量显著低于野生型(图7-E)。

3 讨 论

“榴枝婀娜榴实繁,榴膜轻明榴子鲜”,石榴兼具营养、保健、观赏、生态、文化及文明等多重价值,备受国内外关注和喜爱。石榴花色苷是其色泽性状构成的重要物质基础,也是其果实营养保健价值的重要物质来源[4,19]。国内外学者围绕石榴不同品种[16]、发育期[1]、组织及地源间花色苷种类、含量情况进行了诸多研究[5,19],尽管如此,石榴花色苷合成相关基因的研究仍有待加强。F3H参与决定了植物叶色[30]、花色[29]、种皮和果实着色等性状[34-35]。因此,笔者在本研究中比较详细地介绍了石榴PgF3H基因家族成员的序列、大小、编码蛋白结构预测、基因结构和顺式作用元件等信息,并分析了PgF3H基因家族成员在石榴籽粒花色苷合成中的作用,为石榴色泽形成研究和品种改良提供科学依据。

根据已有报道,水稻(5个)和节节麦(3个)等单子叶植物以及拟南芥(1个)、欧洲葡萄(1个)[31]和苹果(2个)[32]等双子叶植物中F3H基因数量均较少,也有研究从12种单子叶植物中共鉴定了44个F3H基因[34]。类似地,笔者在本研究中根据突尼斯软籽石榴基因组信息,共鉴定到3个PgF3H基因,它们均具有典型的CYP75B结构域,它是决定F3H控制植物器官花色苷合成和呈色的功能结构域[36]。进而对来自不同物种的47个PgF3H构建了系统发育树,结果发现PgF3H3和AtF3H具有较近的亲缘关系,属于Group Ⅱ,而PgF3H1和PgF3H2同源,与OsF3H2/3具有较近的亲缘关系,属于Group Ⅲ,这说明它们可能具有相似的功能。研究结果还证明了PgF3H1和PgF3H2具有比较保守的基序和结构域(CYP75B),并且这些保守基序的排列顺序也相当保守。这与已有研究发现“不同单子叶和双子叶植物中F3H基因保守基序的排列顺序及其CYP75B结构域相当保守”的论点一致[26,33]。然而,相比旁系同源基因对PgF3H1/PgF3H2,PgF3H3缺失了motif 7,这可能是它们分属于不同亚族的原因,它们在具体生物学功能上可能有不同分工。

笔者在本研究中进一步分析了石榴PgF3Hs上游2000 bp启动子序列内的顺式作用元件,以了解其可能的调控机制,结果发现PgF3H2和PgF3H3启动子上具有比PgF3H1数量更多的顺式作用元件,而且PgF3H2启动子上有8个生长发育相关及4个AUX相关的作用元件,而PgF3H3有5个G-box光响应及6个ABA相关的作用元件。植物花色苷合成受AUX和ABA显著调控,苹果中生长素响应因子MdARF结合MdDFR启动子抑制其表达从而负调控花色苷合成[37];ABA处理提高了夏黑葡萄锦葵素、矮牵牛素水平[38];在草莓中,ABA处理显著促进了果实红色素及花色苷积累,而AUX处理则相反[39]。以上分析暗示着PgF3H2和PgF3H3的表达与激素和光有关,相比PgF3H1,是作用于石榴籽粒花色苷合成更重要的基因。还发现与PgF3H2和PgF3H3相比,PgF3H1在石榴籽粒发育过程中表达量极低,这也说明了PgF3H2和PgF3H3的重要性。另外,PgF3H2和PgF3H3启动子上均具有MYB结合位点。已有研究表明PgMYB1能够直接结合下游PgGSTF6启动子区,从而调控石榴花色苷合成[40];草莓FaMYB5与FaEGL3、FaLWD1/FaLWD1-like互作形成MYB-bHLH-WD40复合体(MBW)直接激活FaF3H转录表达,从而赋予草莓果皮和果肉红色色泽[27];此外,龙眼和猕猴桃等园艺作物果皮着色机制中也存在类似的作用模式[41-42]。由此笔者课题组推测PgF3H2或PgF3H3基因表达受MYB转录调控,通过影响花色苷水平和种类,在石榴籽粒颜色形成中发挥重要作用。因此,进一步解析PgF3Hs基因功能,深入研究其调控机制对阐明石榴籽粒颜色形成的作用非常重要。

F3H基因调控植物组织器官花色苷合成及颜色形成在不同物种中均有报道[27,30,34]。笔者在本研究中进而分析了石榴PgF3H家族成员随果实籽粒着色的表达情况,发现PgF3H3可能主要作用于石榴籽粒早期花色苷合成,而PgF3H2是石榴成熟籽粒呈色的主要作用基因。笔者实验室前期利用突尼斯软籽石榴呈颜色分离的自交后代材料为研究对象,从中克隆到一个和石榴幼叶呈红色相关的PgF3H3基因[20,33],PgF3H3[20,33]与园艺作物樱桃、葡萄[30]和苹果[31]中的F3H相似度较高,而据报道它们均与果实着红色有关[27-28,43],因此,PgF3H3可能是石榴籽粒花色苷合成的重要作用基因。景宗慧等[27]通过同源遗传转化试验证明了过表达草莓(Fragaria×ananassa)FaF3H后其果肉由浅红色变成深红色,矢车菊素-3-O葡萄糖苷含量显著增加,而天竺葵色素-O-葡萄糖苷含量显著下降。笔者在本研究中通过异源转化拟南芥试验,发现过表达PgF3H3株系的幼苗子叶呈红色而野生型呈绿色,并且其花色苷含量显著高于野生型而类胡萝卜素和叶绿素含量显著低于野生型。以上研究结果表明了PgF3H3具有调控花色苷积累和红色形成的功能,并在石榴籽粒颜色形成过程中发挥重要作用。

此外,笔者在本研究中还发现PgF3H基因的表达水平及表达趋势在不同品种石榴籽粒中比较相似,但其成熟籽粒的红色差别比较大,推测除了PgF3H基因外,与花色苷合成相关的苯丙烷代谢途径中其他支路基因应该也发挥了作用。植物颜色形成是多级调控多基因参与的一个复杂网络作用的结果,包括参与早期柚皮素前体物质合成的PAL、CHS和CHI,负责合成中间代谢物二氢黄酮醇、二氢杨梅黄酮和二氢栎皮酮的F3H、F3H和F35H,后期负责合成呈蓝紫色的锦葵素、呈砖红色的花葵素和呈紫红色的芍药素的DFR、ANS、UFGT等,以及负责转运至液泡的GST、MATE及ABC transport等[20-22]。因此,需要通过基因同源转化及基因编辑技术积极探索PgF3H2和PgF3H3基因对石榴籽粒花色苷组分的影响,通过与其他相关基因比较,分析它们对石榴籽粒花色苷积累及颜色形成的贡献。

4 结 论

笔者在本研究中对石榴PgF3H基因家族成员进行了全基因组鉴定和分析,提供了石榴PgF3H基因家族3个成员包括染色体位置、基因大小、蛋白结构、系统发育、基因结构、保守结构域和启动子区顺式作用元件等信息。利用已有转录组数据,分析了石榴PgF3H基因家族3个成员在不同品种石榴籽粒中随发育期的表达情况,明确了PgF3H2和PgF3H3可能是石榴籽粒着色和花色苷合成的重要作用基因。结合前期研究结果,通过遗传转化拟南芥初步验证了PgF3H3具有调控花色苷合成和红色形成的功能。PgF3H2和PgF3H3可能受光和激素影响,通过MYB调控石榴籽粒着色的功能和作用机制有待深入研究。

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收稿日期:2024-01-16 接受日期:2024-03-18

基金项目:兵团重点领域科技攻关计划项目(2021AB015);河南省科技攻关项目(222102110479)

作者简介:陈延惠,女,教授,主要从事果树遗传育种与栽培生理研究。Tel:0371-56552762,E-mail:Chenyanhui188@henau.edu.cn。#为共同第一作者。

*通信作者 Author for correspondence. E-mail:wanxayl@henau.edu.cn;E-mail:hortdept@henau.edu.cn

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