Original Paper

Plant Cell Reports

, Volume 32, Issue 2, pp 319-328

First online:

The promoter of an A9 homolog from the conifer Cryptomeria japonica imparts male strobilus-dominant expression in transgenic trees

  • Manabu KuritaAffiliated withForestry and Forest Products Research Institute, Forest Tree Breeding CenterForestry and Forest Products Research Institute, Forest Bio-Research Center
  • , Ken-ichi KonagayaAffiliated withForestry and Forest Products Research Institute, Forest Bio-Research Center
  • , Atsushi WatanabeAffiliated withFaculty of Agriculture, Kyushu University
  • , Teiji KondoAffiliated withForestry and Forest Products Research Institute, Forest Tree Breeding Center
  • , Katsuaki IshiiAffiliated withForestry and Forest Products Research Institute, Forest Bio-Research Center
  • , Toru TaniguchiAffiliated withForestry and Forest Products Research Institute, Forest Tree Breeding CenterForestry and Forest Products Research Institute, Forest Bio-Research Center Email author 

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Abstract

Key message

GUS analysis in Cryptomeria japonica revealed that the CjMALE1 promoter is activated in the male strobilus of C. japonica.

Abstract

Toward the development of male sterile technology for Cryptomeria japonica, a male strobilus-dominant promoter of C. japonica was isolated. The CjMALE1 gene was isolated from a male strobilus-specific suppression subtractive hybridization (SSH) library, and the promoter was isolated by the TAIL-PCR method. To characterize the CjMALE1 promoter, β-glucuronidase (GUS)-fused genes were constructed and introduced into C. japonica using Agrobacterium tumefaciens. GUS expression from CjMALE1-2.5 K (2,718 bp fragment)::GUS C. japonica and CjMALE1-1 K (1,029 bp fragment)::GUS C. japonica was detected in the tapetum and microspore mother cells. These promoter fragments were comparably active in the pre-meiotic stage of the male strobilus of C. japonica. Our analysis showed that the 1,029 bp promoter had all the cis-elements necessary for male strobilus-dominant expression of CjMALE1. When CjMALE1-1 K::GUS was introduced into Arabidopsis, GUS expression was detected in the same spatiotemporal pattern as in C. japonica. These results suggest that the CjMALE1 promoter is subject to transcriptional regulatory systems consisting of cis- and trans-elements that have been highly conserved during evolution.

Keywords

Cryptomeria japonica Male strobilus-dominant promoter β-glucuronidase TAIL-PCR Arabidopsis