作物学报 ›› 2019, Vol. 45 ›› Issue (12): 1784-1795.doi: 10.3724/SP.J.1006.2019.94053
赵晶,李旭彤,梁学忠,王志城,崔静,陈斌,吴立强,王省芬,张桂寅,马峙英,张艳(
)
Jing ZHAO,Xu-Tong LI,Xue-Zhong LIANG,Zhi-Cheng WANG,Jing CUI,Bin CHEN,Li-Qiang WU,Xing-Fen WANG,Gui-Yin ZHANG,Zhi-Ying MA,Yan ZHANG(
)
摘要:
黄萎病是降低棉花产量和品质较为严重的维管束病害。棉花在抵抗病原菌的过程中, 抗病基因起着尤为重要的作用。漆酶是一种多功能氧化酶, 在植物木质素合成和提高植株抗逆性等方面发挥着重要作用。高质量版本的基因组是提升基因家族分析准确性的必要条件。本研究以目前最新的陆地棉TM-1高质量版本基因组为参考, 通过生物信息学分析鉴定了陆地棉基因组中的Laccase (GhirLAC)基因家族, 并对其进行了理化性质、基因结构、染色体定位以及在黄萎病胁迫下的表达模式分析。结果表明, 陆地棉TM-1基因组中共包含83个GhirLAC家族成员, 分布在24条染色体上, 所有GhirLAC蛋白均定位在胞外, 且具有相同/相似的保守基序。系统发育树分析显示, GhirLAC基因家族成员可分为7个亚组。结合黄萎病胁迫下棉花转录组数据, 将GhirLAC基因家族各成员的表达分为3种模式, 其中第1类和第2类GhirLAC基因在黄萎病菌胁迫下分别呈现有规律的表达量升高和降低, 推测这些基因在棉花抗黄萎病反应中发挥重要功能。荧光定量PCR结果表明, GhirLAC02 (GhLAC4)、GhirLAC38 (GhLAC11)和GhirLAC20 (GhLAC12) 3个候选基因均受黄萎病菌诱导表达, 其表达趋势与转录组数据相吻合。本研究为以后深入解析棉花GhirLAC基因的抗病功能及分子机制奠定基础。
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