韩金龙;李慧;丛郁;常有宏;蔺经;

• 1:南京农业大学园艺学院
• 2:江苏省农业科学院园艺研究所·江苏省高效园艺作物遗传改良重点实验室
• 3:中国科学院南京土壤研究所土壤与农业可持续发展国家重点实验室

摘要(Abstract)：

【目的】克隆2个杜梨类钙调磷酸酶B亚基蛋白(Calcineurin B-like protein,CBL)基因,并对其序列特征、表达特点及抗逆功能进行比较研究。【方法】采用电子克隆、RT-PCR和长片段PCR克隆了PbCBL1和PbCBL7的cDNA和DNA序列,利用生物信息学方法进行序列分析,半定量RT-PCR检测它们的表达特点,原核表达初步比较研究上述2个基因的抗逆功能。【结果】杜梨PbCBL1 cDNA编码区为642 bp,编码213个氨基酸,对应基因组DNA序列长2 969 bp;PbCBL7 cDNA编码区为639 bp,编码212个氨基酸,对应基因组DNA序列长1 788 bp;PbCBL1和PbCBL7均由8个外显子和7个内含子组成。PbCBL1和PbCBL7编码的多肽均具有植物类钙调磷酸酶B亚基蛋白结合Ca2+所必需的4个EF手型结构和1个典型的植物钙调磷酸酶A亚基结合位点。未经处理的杜梨幼苗(对照)根和叶中PbCBL1和PbCBL7的表达非常微弱,NaCl、PEG6000、甘露醇和ABA处理后,它们在根和叶中的表达均上调,且PbCBL1在叶片中的表达量显著增加。2个CBL基因分别转入大肠杆菌BL21(DE3)后,均能够明显减轻NaCl、甘露醇和PEG6000对菌株的生长抑制,而转PbCBL1菌株的抗逆效果较为明显。【结论】PbCBL1和PbCBL7基因具备植物CBLs基因家族的固有特征,对盐碱、干旱、渗透胁迫和ABA处理均存在转录响应,上述基因的转入能够提高大肠杆菌BL21(DE3)对盐胁迫和渗透胁迫的耐受能力,转PbCBL1菌株的抗逆功能强于转PbCBL7菌株。

关键词(KeyWords)： 杜梨;CBL基因;序列特征;表达特点;功能比较

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金(31372051;31101529);; 江苏省农业科技自主创新资金[CX(12)5033]

作者(Author): 韩金龙;李慧;丛郁;常有宏;蔺经;

Email:

DOI: 10.13925/j.cnki.gsxb.20130515

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