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Microbial colonization on the leaf surfaces of different genotypes of Napier grass.

Abstract：

:To address correlations between population sizes of microbes on the leaf surfaces and leaf morphological and physicochemical properties, various leaf morphological and physicochemical features as possible predictors of microbial population sizes on the leaf surfaces of four Napier grass cultivars were assessed. Results indicated microbes except for lactic acid bacteria (LAB) preferred to colonize the leaf surfaces bearing trichomes, and their population sizes were significantly correlated with trichomes, especially for yeasts. The population sizes of microbes were positively correlated with soluble sugar content (p < 0.05). Furthermore, no significant correlation was found between population sizes of microbes and wax content, except for yeasts. The multivariate regression trees (MRT) analysis showed different genotypes of leaf-microbe system could be characterized by four-leaf attributes with soluble sugar of leaf tissues being the primary explanatory attribute. Leaves with soluble sugar content below 9.72 mg g-1 fresh weight (FW) were rarely colonized. For leaves with soluble sugar content above 9.72 mg g-1 FW, water content was the next explanatory leaf attribute, followed by wax content on the leaf surfaces. Leaves with higher water content (> 73%) were more colonized, and small microbial population was associated with higher wax content (> 10.66 mg g-1 dry matter). In conclusion, leaf chemical attributes have a higher contribution than morphological structure properties in determining population sizes of microbes on the leaf surfaces. The exuded soluble sugar and protein promote the development of microbial populations. For different genotypes of leaf-microbe system, the relationship between microbial abundance on their leaf surfaces and leaf morphological structure or physicochemical properties may be predicted by the MRT. Population sizes of microbes are primarily influenced by soluble sugar content under the water-rich conditions.

journal_name

Arch Microbiol

journal_title

Archives of microbiology

authors

Tang G,Xu L,Yin X,Hu Y,Tian J,Zhang J

doi

10.1007/s00203-020-02025-4

subject

Has Abstract

pub_date

2021-01-01 00:00:00

pages

335-346

issue

eissn

0302-8933

issn

1432-072X

pii

10.1007/s00203-020-02025-4

journal_volume

203

pub_type

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Microbial colonization on the leaf surfaces of different genotypes of Napier grass.