The StLAC2 gene is required for cell wall integrity, DHN-melanin synthesis and the pathogenicity of Setosphaeria turcica

作者：Ma, Shuangxin; Cao, Keke; Liu, Ning; Meng, Chuan; Cao, Zhiyan^*; Dai, Dongqing; Jia, Hui; Zang, Jinpin; Li, Zhiyong; Hao, Zhimin; Gu, Shouqin; Dong, Jingao^*

来源：Fungal Biology, 2017, 121(6-7): 589-601.

DOI：10.1016/j.funbio.2017.04.003

• Gene function
• Laccase
• Fungal development
• Infection

Laccases are blue multicopper oxidases, play important roles in various biological processes. These processes include fungal dihydroxynaphthalene (DHN)-melanin biosynthesis and pathogenicity, cellular growth, morphogenesis, and differentiation. This study investigated functions of the laccase gene StLAC2 in Setosphaeria turcica. The Delta lac2 mutant colony color was distinct from that of the S. turcica wild-type (WT) isolate, and the mutants exhibited defective conidial formation. In contrast to the WT, the mutants exhibited a lighter color on the 2, 2-azino-di-[3-ethylbenzo-thia-zolin-sulphonate] (ABTS) plates, and the intracellular laccase activity was lower. Notably, StLAC2 gene loss correlated with decreased DHN-melanin biosynthesis and affected the integrity of the cell wall, where the StLAC2 gene mutants showed thinner, more transparent walls with a higher number of mitochondria than the WT. The Delta lac2 mutants also lost their pathogenicity in maize. The results indicated that the StLAC2 gene involved in cell wall integrity, melanin biosynthesis and appressorial and conidial formation.

• 出版日期2017-6
• 单位河北农业大学; 河北省农林科学院