期刊
PLANT CELL AND ENVIRONMENT
卷 40, 期 2, 页码 304-316出版社
WILEY-BLACKWELL
DOI: 10.1111/pce.12849
关键词
maize; aerenchyma; crop flooding tolerance; introgression lines; lignin; suberin; waterlogging tolerance
资金
- Development of mitigation and adaptation techniques to global warming in the sectors of agriculture, forestry, and fisheries [4203]
- Japan Society for the Promotion of Science (JSPS) KAKENHI Grant [15H04434]
- JSPS
- Grants-in-Aid for Scientific Research [15H04434, 14J04422] Funding Source: KAKEN
A radial oxygen loss (ROL) barrier in roots of waterlogging-tolerant plants promotes oxygen movement via aerenchyma to the root tip, and impedes soil phytotoxin entry. The molecular mechanism and genetic regulation of ROL barrier formation are largely unknown. Zea nicaraguensis, a waterlogging-tolerant wild relative of maize (Zea mays ssp. mays), forms a tight ROL barrier in its roots when waterlogged. We used Z. nicaraguensis chromosome segment introgression lines (ILs) in maize (inbred line Mi29) to elucidate the chromosomal region involved in regulating root ROL barrier formation. A segment of the short-arm of chromosome 3 of Z. nicaraguensis conferred ROL barrier formation in the genetic background of maize. This chromosome segment also decreased apoplastic solute permeability across the hypodermis/exodermis. However, the IL and maize were similar for suberin staining in the hypodermis/exodermis at 40mm and further behind the root tip. Z. nicaraguensis contained suberin in the hypodermis/exodermis at 20mm and lignin at the epidermis. The IL with ROL barrier, however, did not contain lignin in the epidermis. Discovery of the Z. nicaraguensis chromosomal region responsible for root ROL barrier formation has improved knowledge of this trait and is an important step towards improvement of waterlogging tolerance in maize.
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