Linnemannia elongata: a key species in chitin-based plant growth promotion

IF 3.3 3区 生物学 Q2 MICROBIOLOGY
C. De Tender, M. Vandecasteele, S. Ommeslag, Noémie De Zutter, Ellen Vandenbussche, A. Haegeman, K. Audenaert, Leilei Li, Bart Vandecasteele, Floris Voorthuijzen, Kristof Maenhout, Stien Beirinckx, Rosita Barneveldt, Sofie Goormachtig, J. Debode
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Abstract

Chitin has proven to be a valuable alternative for mineral fertilizers in growing media. We recently hypothesized that chitin might work as a biostimulant, attracting plant growth promoting microbes to the rhizosphere. Especially Mortierellales increase massively in abundance by chitin application and might have a profound role in chitin-mediated plant growth promotion. We isolated four strains of this order, classified as Linnemannia elongata, from chitin-enriched growing medium and the lettuce rhizosphere. The isolates induced a consistent increase in shoot and root fresh weight and increased chlorophyll content of Arabidopsis thaliana in vitro as measured by multispectral imaging. By studying the isolate’s genomes, we postulate that this growth promotion is induced through auxin production and/or translocation of Ca to the plant. The synergy between chitin and L. elongata was demonstrated by (1) the chitinase activity and chitin degradation potential of all isolates and (2) the positive effect of chitin and L. elongata seed coating on germination of A. thaliana seeds as compared to L. elongata seed coating without chitin. We conclude that chitin-related growth promotion is depending on the activation of the microbial community, with L. elongata as a key species.
Linnemannia elongata:以几丁质为基础促进植物生长的关键物种
甲壳素已被证明是生长介质中矿物肥料的重要替代品。我们最近推测,几丁质可以作为一种生物刺激剂,吸引促进植物生长的微生物进入根瘤层。特别是毛霉属(Mortierellales)微生物的数量会随着几丁质的施用而大量增加,并可能在几丁质介导的植物生长促进过程中发挥重要作用。我们从富含几丁质的生长介质和莴苣根瘤菌层中分离出了四株该菌纲的菌株,它们被归类为Linnemannia elongata。通过多光谱成像测量,这些分离菌株在体外诱导拟南芥的芽和根鲜重持续增加,叶绿素含量也有所增加。通过研究分离物的基因组,我们推测这种生长促进作用是通过产生辅助素和/或将 Ca 转化到植物体内而诱导的。甲壳素与纤毛虫之间的协同作用体现在:(1)所有分离物的甲壳素酶活性和甲壳素降解潜力;(2)与不含甲壳素的纤毛虫种子包衣相比,甲壳素和纤毛虫种子包衣对黄连木种子萌发的积极影响。我们的结论是,与几丁质相关的生长促进作用取决于微生物群落的激活,而长叶菌是其中的关键物种。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
CiteScore
7.40
自引率
6.80%
发文量
42
审稿时长
4 weeks
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