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- Title
Identification of ZmBK2 Gene Variation Involved in Regulating Maize Brittleness.
- Authors
Xu, Wei; Zhao, Yan; Liu, Qingzhi; Diao, Yuqiang; Wang, Qingkang; Yu, Jiamin; Jiang, Enjun; Zhang, Yongzhong; Liu, Baoshen
- Abstract
Maize stalk strength is a crucial agronomic trait that affects lodging resistance. We used map-based cloning and allelic tests to identify a maize mutant associated with decreased stalk strength and confirmed that the mutated gene, ZmBK2, is a homolog of Arabidopsis AtCOBL4, which encodes a COBRA-like glycosylphosphatidylinositol (GPI)-anchored protein. The bk2 mutant exhibited lower cellulose content and whole-plant brittleness. Microscopic observations showed that sclerenchymatous cells were reduced in number and had thinner cell walls, suggesting that ZmBK2 affects the development of cell walls. Transcriptome sequencing of differentially expressed genes in the leaves and stalks revealed substantial changes in the genes associated with cell wall development. We constructed a cell wall regulatory network using these differentially expressed genes, which revealed that abnormal cellulose synthesis may be a reason for brittleness. These results reinforce our understanding of cell wall development and provide a foundation for studying the mechanisms underlying maize lodging resistance.
- Subjects
CELLULOSE synthase; BRITTLENESS; MOLECULAR cloning; PETIOLES; GENES; CORN
- Publication
Genes, 2023, Vol 14, Issue 6, p1126
- ISSN
2073-4425
- Publication type
Article
- DOI
10.3390/genes14061126