Overexpression of miR164b-resistant OsNAC2 improves plant architecture and grain yield in rice.

ABSTRACT: Plant architecture is a major target of rice (Oryza sativa) breeding and selection, but the underlying regulatory networks remain unclear. Here, we overexpressed an OsNAC2 mutant (OErN) that cannot be cleaved by the miRNA miR164b. OErN plants had better plant architecture and longer panicles, and produced more grains. The parental line averaged 12.2 primary and 31.5 secondary branches in the main panicles; two OErN lines averaged 15.0 and 15.2 primary, and 41.5 and 44.3 secondary branches. In large-scale field trials, OErN plants produced at least 58.62% more total grain (by weight) compared with the parental line. They also had more large and small vascular bundles in the stem internodes and leaves. Overexpression of miR164b or down-regulation of OsNAC2 led to decreased panicle length and

SUBMITTER: Jiang D 

PROVIDER: S-EPMC5888996 | biostudies-literature | 2018 Mar

REPOSITORIES: biostudies-literature