The maize ( Zea mays L.) roothairless3 gene encodes a putative GPI‐anchored, monocot‐specific, COBRA‐like protein that significantly affects grain yield

Abstract

Summary The rth3 ( roothairless 3 ) mutant is specifically affected in root hair elongation. We report here the cloning of the rth3 gene via a PCR‐based strategy (amplification of insertion mutagenized sites) and demonstrate that it encodes a COBRA‐like protein that displays all the structural features of a glycosylphosphatidylinositol anchor. Genes of the COBRA family are involved in various types of cell expansion and cell wall biosynthesis. The rth3 gene belongs to a monocot‐specific clade of the COBRA gene family comprising two maize and two rice genes. While the rice ( Oryza sativa ) gene OsBC1L1 appears to be orthologous to rth3 based on sequence similarity (86% identity at the protein level) and maize/rice synteny, the maize ( Zea mays L.) rth3‐like gene does not appear to be a functional homolog of rth3 based on their distinct expression profiles. Massively parallel signature sequencing analysis detected rth3 expression in all analyzed tissues, but at relatively low levels, with the most abundant expression in primary roots where the root hair phenotype is manifested. In situ hybridization experiments confine rth3 expression to root hair‐forming epidermal cells and lateral root primordia. Remarkably, in replicated field trials involving near‐isogenic lines, the rth3 mutant conferred significant losses in grain yield.

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Cited by papers we hold 2

• Genome-wide association analysis of seedling root development in maize (Zea mays L.) · 2015
  No notice
• Brittle Culm1, a COBRA-Like Protein, Functions in Cellulose Assembly through Binding Cellulose Microfibrils · 2013
  No notice

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