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Response of Resistant and Susceptible Bayberry Cultivars to Infection of Twig Blight Pathogen by Histological Observation and Gibberellin Related Genes Expression

文献类型： 外文期刊

作者： Ren, Haiying 1 ; Wu, Yangchun 2 ; Ahmed, Temoor 3 ; Qi, Xingjiang 1 ; Li, Bin 3 ;

作者机构： 1.Zhejiang Acad Agr Sci, Inst Hort, Hangzhou 310021, Peoples R China

2.Zhejiang Normal Univ, Coll Chem & Life Sci, Jinhua 321004, Zhejiang, Peoples R China

3.Zhejiang Univ, Inst Biotechnol, State Key Lab Rice Biol, Hangzhou 310058, Peoples R China

4.Zhejiang Univ, Inst Biotechnol, Minist Agr, Key Lab Mol Biol Crop Pathogens & Insects, Hangzhou 310058, Peoples R China

关键词： bayberry twig blight; Pestalotiopsis; invasion mechanism; gibberellin; gene expression

期刊名称：PATHOGENS （ 影响因子：3.018； ）

ISSN：

年卷期： 2021 年 10 卷 4 期

页码：

收录情况： SCI

摘要： Bayberry is an important fruit tree native to the subtropical regions of China. However, a systematic twig blight disease caused by Pestalotiopsis versicolor and P. microspora, resulted in the death of the whole tree of bayberry. The main variety Dongkui is highly sensitive to the twig blight disease, but the variety Zaojia is very highly resistant to the disease. Therefore, it is very necessary to clear the difference between resistant and susceptible varieties in response to the fungal infection. In this paper, we investigated the response of resistant and susceptible bayberry cultivars to infection of twig blight pathogen by histological observation and gibberellin signaling pathway-related genes expression. Microscopic observation revealed the difference in the infection process between resistant and susceptible varieties. The results of frozen scanning electron microscopy showed that the Pestalotiopsis conidia were shrunk, the mycelium was shriveled and did not extend into the cells of resistant cultivars, while the conidia were full and the top was extended, the mycelia was normal and continued to extend to the cells of a susceptible cultivar. Indeed, the medulla cells were almost intact in resistant cultivar, but obviously damaged in susceptible cultivar after inoculation of the main fungal pathogen P. versicolor conidia, which is earlier germinated on sterile glass slide than that of a hard plastic slide. The quantitative real-time PCR results showed a significant difference between resistant and susceptible cultivars in the expression of gibberellin signaling pathway-related genes in leaves and stems of bayberry, which is closely related to infection time, the type of genes and varieties. Overall, this study provides a clue for our understanding of the resistance mechanism of bayberry against the twig blight disease.

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