中国农业科学 ›› 2019, Vol. 52 ›› Issue (5): 882-892.doi: 10.3864/j.issn.0578-1752.2019.05.010
谭彬1,2,陈谭星1,韩亚萍1,张亚如1,郑先波1,2,程钧1,2,王伟1,2,冯建灿1,2()
收稿日期:
2018-10-10
接受日期:
2018-11-17
出版日期:
2019-03-01
发布日期:
2019-03-12
通讯作者:
冯建灿
作者简介:
谭彬,E-mail: 基金资助:
TAN Bin1,2,CHEN TanXing1,HAN YaPing1,ZHANG YaRu1,ZHENG XianBo1,2,CHENG Jun1,2,WANG Wei1,2,FENG JianCan1,2()
Received:
2018-10-10
Accepted:
2018-11-17
Online:
2019-03-01
Published:
2019-03-12
Contact:
JianCan FENG
摘要: 【目的】 分离克隆桃(Prunus persica L.)体细胞胚胎发生相关类受体蛋白激酶(somatic embryogenesis receptor-like kinases,SERKs)基因SERK2 ,检测其在不同状态桃愈伤组织中的表达差异,分析SERK2 与胚性愈伤组织发生的关系,为揭示组织培养困难树种桃胚性愈伤组织产生的分子机理奠定基础。【方法】 采用同源克隆法获得PpSERK2 的cDNA全长序列,运用TMPred、DNAMAN和MEGA 5.0等生物信息学软件对序列进行分析;以‘秋蜜红’花药为外植体,接种至添加2.0 mg·L -1 6-BA和1.0 mg·L -1 2,4-D的NN69培养基诱导愈伤组织;将获得的不同状态愈伤组织制作石蜡切片并进行组织细胞学观察;通过实时荧光定量PCR(qRT-PCR)对PpSERK2 在4种不同状态愈伤组织中的表达进行分析。 【结果】 克隆获得‘秋蜜红’PpSERK2 的cDNA全长序列1 881 bp,编码626个氨基酸,其蛋白质理论分子量为68.99 kD,理论等电点为5.38,具有完整的SERK蛋白的保守结构域,与牡丹(Paeonia suffruticosa )等物种的同源性为67.88%—92.71%,且与秘鲁番茄(Solanum peruvianu )和温州蜜柑(Citrus unshiu )的相似性最高。在与其他物种的SERK蛋白构建的系统进化树中,PpSERK2与SpSERK1、CitSERK1和PsSERK2等聚在一起,与同源性比对结果一致。以‘秋蜜红’花药为外植体诱导获得4种不同状态的愈伤组织,组织细胞学观察发现黄色疏松状(球形胚出现)、绿色紧实状(心形胚出现)和浅黄色透明状(尚未完全形成的鱼雷形胚结构出现)的3种状态的愈伤组织细胞小、排列紧密;而黄白色水渍状愈伤组织细胞体积大、排列不规则,细胞质稀且染色浅。根据形态学和组织学的鉴定结果,可知黄色疏松状、绿色紧实状和浅黄色透明状的3种状态的愈伤组织均为胚性愈伤组织,而黄白色水渍状愈伤组织为非胚性愈伤组织。实时荧光定量PCR(qRT-PCR)结果表明,PpSERK2 在‘秋蜜红’3种状态的胚性愈伤组织中的表达量显著高于非胚性愈伤组织,且在3种胚性愈伤组织中的表达量有差异,其中在黄色疏松状愈伤组织中表达量最高,绿色紧实状次之,浅黄色透明状中最低。【结论】 克隆获得PpSERK2 的cDNA全长序列,其在3种状态的胚性愈伤组织中的表达量明显高于非胚性愈伤组织,且在黄色疏松状胚性愈伤组织中的表达量最高,PpSERK2 在桃体细胞胚发育的早期发挥作用。
谭彬,陈谭星,韩亚萍,张亚如,郑先波,程钧,王伟,冯建灿. 桃SERK2 的克隆及其在不同状态愈伤组织中的表达分析[J]. 中国农业科学, 2019, 52(5): 882-892.
TAN Bin,CHEN TanXing,HAN YaPing,ZHANG YaRu,ZHENG XianBo,CHENG Jun,WANG Wei,FENG JianCan. Cloning and Expression Analysis of SERK2 Gene in Different Forms of Calli on Peach (Prunus persica L.)[J]. Scientia Agricultura Sinica, 2019, 52(5): 882-892.
图3
不同植物的SERK氨基酸序列比对 PpSERK2:桃Prunus persica ,XP_007201734.1;PsSERK2:牡丹Paeonia suffruticosa ,KY200849.1;CitSERK1:温州蜜柑Citrus unshiu ,AB115767.1;BdSERK2:二穗短柄草Brachypodium distachyon ,XP_003571417.2;SpSERK1:秘鲁番茄Solanum peruvianu ,EF623824.1;AcSERK1:菠萝Ananas comosus ,HM236375.2;AcSERK2:菠萝Ananas comosus ,HM236376.1;HvSERK1:大麦Prunus persica ,AK372118.1;OsSERK1:水稻Oryza sativa ,AB188247.1;OsSERK2:水稻Oryza sativa ,XP_015636497.1;ZmSERK1:玉米Zea mays ,AJ277702.1;ZmSERK2:玉米Zea mays ,AJ277703.1;AtSERK1:拟南芥Arabidopsis thaliana ,NP_177328.1;AtSERK2:拟南芥Arabidopsis thaliana ,AF384969.1;AtSERK3:拟南芥Arabidopsis thaliana ,AF384970.1;AtSERK4:拟南芥Arabidopsis thaliana ,NP_178999.2;AtSERK5:拟南芥Arabidopsis thaliana ,NM_126956.4。划线部分为保守结构域The conserved regions are marked with lines"
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