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Journal of Integrative Agriculture:玉米種質的馴化過程中根際微生物群落結構動態特徵

2022-05-23由 農業環境科學 發表于 林業

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Journal of Integrative Agriculture:玉米種質的馴化過程中根際微生物群落結構動態特徵

Journal of Integrative Agriculture:玉米種質的馴化過程中根際微生物群落結構動態特徵

華南農業大學與中科院東北地理與農業生態研究所

系統解析了玉米種質的馴化過程中根際微生物群落結構動態特徵,及其對提高玉米抗生物脅迫特性和土壤養分有效性的潛在影響。相關成果發表於

Journal of Integrative Agriculture

IF

=2。848)。

華南農業大學農學院黃君為該論文第一作者,中科院東北地理與農業生態研究所金劍研究員和華南農業大學農學院連騰祥副教授為共同通訊作者。該研究受到了廣東省重點研發計劃(2018B020202013),國家重點研發計劃(2018YFD1000903)和廣東省自然科學基金(2018A030313865)的支援。

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doi: 10。1016/S2095-3119(21)63633-X

Abstract

Domestication and genetic improvement of maize improve yield and stress tolerance due to changes in morphological and physiological properties, which likely alter

rhizosphere

microbial diversity。 Understanding how the evolution of maize

germplasm

impacts its rhizobacterial traits during the growth stage is important for optimizing plant-microbe associations and obtaining yield gain in domesticated germplasms。 In this study, a total of nine accessions representing domestication and subsequent genetic improvement were selected。 We then sequenced the plant DNA and rhizobacterial DNA of teosinte,

landraces

and

inbred lines

at the seedling,

flowering

and maturity stages in a field trial。 Moreover, the

soil chemical properties

were determined at the respective stages to explore the associations of soil characteristics with

bacterial community

structures。 The results showed that domestication and genetic improvement increased the rhizobacterial diversity and substantially altered the rhizobacterial community composition。 The core

microbiome

in the rhizosphere differed among germplasm groups。 The co-occurrence network analysis demonstrated that the modularity in the bacterial network of the inbred lines was greater than those of teosinte and the landraces。 In conclusion, the increased diversity of the rhizobacterial community with domestication and genetic improvement may improve maize resilience to

biotic stresses

and soil nutrient availability to plants。

Journal of Integrative Agriculture:玉米種質的馴化過程中根際微生物群落結構動態特徵

玉米的馴化和遺傳改良導致植株形態和生理特性的變化,進而提高了產量和抗逆性,這可能與根際細菌的多樣性密切關聯。瞭解玉米種質的進化如何在生長階段影響其根際細菌,對於最佳化植物與微生物的關係,以及在現代育種過程中提高產量至關重要。

該項研究選擇了9個大芻草、地方品種以及自交系為材料。在田間試驗條件下,對苗期、開花期和成熟期的玉米DNA和根際土壤DNA進行測序,並探索根際細菌群落結構與土壤化學特徵的關聯。我們發現玉米馴化和遺傳改良增加了玉米根際細菌的多樣性,並顯著改變了菌群組成。根際核心菌群在不同的種質群中存在差異。網路分析表明,自交系的根際細菌網路模組化程度大於玉米的直系祖先-大芻草和地方品種。隨著馴化和遺傳改良,根際細菌群落的多樣性呈增加趨勢,這可能會提高玉米對生物脅迫的適應性和根際土壤養分有效性。