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Int J Mol Sci ; 22(13)2021 Jun 29.
Article in English | MEDLINE | ID: mdl-34209973

ABSTRACT

In maize, the ear shank is a short branch that connects the ear to the stalk. The length of the ear shank mainly affects the transportation of photosynthetic products to the ear, and also influences the dehydration of the grain by adjusting the tightness of the husks. However, the molecular mechanisms of maize shank elongation have rarely been described. It has been reported that the maize ear shank length is a quantitative trait, but its genetic basis is still unclear. In this study, RNA-seq was performed to explore the transcriptional dynamics and determine the key genes involved in maize shank elongation at four different developmental stages. A total of 8145 differentially expressed genes (DEGs) were identified, including 729 transcription factors (TFs). Some important genes which participate in shank elongation were detected via function annotation and temporal expression pattern analyses, including genes related to signal transduction hormones (auxin, brassinosteroids, gibberellin, etc.), xyloglucan and xyloglucan xyloglucosyl transferase, and transcription factor families. The results provide insights into the genetic architecture of maize ear shanks and developing new varieties with ideal ear shank lengths, enabling adjustments for mechanized harvesting in the future.


Subject(s)
Gene Expression Profiling/methods , Gene Regulatory Networks , Zea mays/growth & development , Gene Expression Regulation, Developmental , Gene Expression Regulation, Plant , Gene Ontology , Phenotype , Plant Proteins/genetics , Quantitative Trait Loci , Transcription Factors , Zea mays/genetics
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