王影;李慧;蔺经;杨青松;张绍铃;常有宏;

• 1:南京农业大学园艺学院
• 2:江苏省农业科学院果树研究所
• 3:江苏省高效园艺作物遗传改良重点实验室

摘要(Abstract)：

【目的】NHX基因亚家族为钠氢逆转运体,具有Na+/H+exchange(PF00999)蛋白结构域,广泛存在于多种物种中,主要参与植物响应盐胁迫过程离子平衡的重建。分析鉴定杜梨中NHX基因及其耐盐机制有助于实际生产中更为有效地利用这一砧木资源。【方法】结合已公布的梨基因组数据以及拟南芥相关数据,通过生物信息学手段,鉴定杜梨NHX基因家族成员;通过MEGA7.0软件进行序列比对以及进化分析;通过在线工具Pfam、SMART以及GSDS进行基因结构分析;通过定量PCR技术分析非生物胁迫下基因在不同组织中的表达特征;应用火焰石墨炉原子吸收光谱仪测定NaCl胁迫下杜梨不同组织中Na+与K+含量。【结果】成功鉴定出16个候选基因,其中有4个基因属于NHX亚家族,4个基因属于CHX亚家族,8个基因属于KEA亚家族。预测的候选基因均含有Na+/H+exchange功能域;NaCl胁迫下,预测的16个基因在叶片中的表达差异大,但在8 h以后均为负调控;在茎中,PEG6000处理下,PbNHX1的表达量显著增高,且高于同一时期NaCl胁迫下的表达水平,仅在48 h时低于同一时期NaCl胁迫下的表达水平;在根中,基因PbNHX12、PbNHX13、PbNHX14和PbNHX15在NaCl胁迫和PEG6000处理下在任何时间段均为负调控。【结论】在盐胁迫过程中,与拟南芥NHX基因进化关系最近的PbNHX1和PbNHX11呈现出负调控模式,与拟南芥KEA基因进化关系相近的PbNHX10和PbNHX7可能参与K+的运输。

关键词(KeyWords)： 杜梨;NHX基因家族;非生物胁迫;实时定量PCR

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金(31372051,31772287);; 江苏省自然科学基金(BK20151361)

作者(Author): 王影;李慧;蔺经;杨青松;张绍铃;常有宏;

Email:

DOI:

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