KRN5b regulates maize kernel row number through mediating phosphoinositol signalling.

ABSTRACT: Kernel row number (KRN) is a major yield related trait for maize (Zea mays L.) and is also a major goal of breeders, as it can increase the number of kernels per plant. Thus, identifying new genetic factors involving in KRN formation may accelerate improving yield-related traits genetically. We herein describe a new kernel number-related gene (KRN5b) identified from KRN QTL qKRN5b and encoding an inositol polyphosphate 5-phosphatase (5PTase). KRN5b has phosphatase activity towards PI(4,5)P₂, PI(3,4,5)P₃, and Ins(1,4,5)P₃ in vitro. Knocking out KRN5b caused accumulation of PI(4,5)P₂ and Ins(1,4,5)P₃, resulting in disordered kernel rows and a decrease in the number of kernels and tassel branches. The introgression of the allele with high

SUBMITTER: Shen X 

PROVIDER: S-EPMC11606425 | biostudies-literature | 2024 Dec

REPOSITORIES: biostudies-literature