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Dynamic transcriptome analysis unravels key regulatory genes of maize root growth and development in response to potassium deficiency

文献类型： 外文期刊

作者： Guo, Song 1 ; Liu, Zhigang 2 ; Sheng, Huajin 2 ; Olukayode, Toluwase 2 ; Zhou, Zijun 1 ; Liu, Yonghong 3 ; Wang, Meng 4 ; He, Mingjiang 1 ; Kochian, Leon 2 ; Qin, Yusheng 1 ;

作者机构： 1.Sichuan Acad Agr Sci, Inst Agr Resources & Environm, Chengdu 610066, Peoples R China

2.Univ Saskatchewan, Global Inst Food Secur, Saskatoon, SK S7N 4L8, Canada

3.Sichuan Acad Agr Sci, Crop Res Inst, Chengdu 610066, Peoples R China

4.Jilin Acad Agr Sci, Inst Agr Resource & Environm, Changchun 130033, Peoples R China

关键词： Differentially expressed genes; Hub genes; Potassium deficiency; Root system architecture; Weighted gene co-expression network

期刊名称：PLANTA （ 影响因子：4.3； 五年影响因子：4.8 ）

ISSN： 0032-0935

年卷期： 2023 年 258 卷 5 期

页码：

收录情况： SCI

摘要： Main conclusionIntegrated root phenotypes and transcriptome analysis have revealed key candidate genes responsible for maize root growth and development in potassium deficiency.AbstractPotassium (K) is a vital macronutrient for plant growth, but our understanding of its regulatory mechanisms in maize root system architecture (RSA) and K+ uptake remains limited. To address this, we conducted hydroponic and field trials at different growth stages. K+ deficiency significantly inhibited maize root growth, with metrics like total root length, primary root length, width and maximum root number reduced by 50% to 80% during early seedling stages. In the field, RSA traits exhibited maximum values at the silking stage but continued to decline thereafter. Furthermore, K deprivation had a pronounced negative impact on root morphology and RSA growth and grain yield. RNA-Seq analysis identified 5972 differentially expressed genes (DEGs), including 17 associated with K+ signaling, transcription factors, and transporters. Weighted gene co-expression network analysis revealed 23 co-expressed modules, with enrichment of transcription factors at different developmental stages under K deficiency. Several DEGs and transcription factors were predicted as potential candidate genes responsible for maize root growth and development. Interestingly, some of these genes exhibited homology to well-known regulators of root architecture or development in Arabidopsis, such as Zm00001d014467 (AtRCI3), Zm00001d011237 (AtWRKY9), and Zm00001d030862 (AtAP2/ERF). Identifying these key genes helps to provide a deeper understanding of the molecular mechanisms governing maize root growth and development under nutrient deficient conditions offering potential benefits for enhancing maize production and improving stress resistance through targeted manipulation of RSA traits in modern breeding efforts.

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