期刊
MOLECULAR PLANT
卷 14, 期 10, 页码 1714-1732出版社
CELL PRESS
DOI: 10.1016/j.molp.2021.07.004
关键词
rice; brown planthopper; fortified sclerenchyma-mediated resistance; cell wall; leaf sheath; breeding
资金
- Major Program of Guangdong Basic and Applied Research, China [2019B030302006]
- National Program on Research and Development of Transgenic Plants of China [2016ZX08009-003]
- National Natural Science Foundation of China [31630063]
- National Key Research and Development Program of China [2016YFD0100600, 2016YFD0100900]
The resistance of rice plants to the brown planthopper is associated with the fortification of the sclerenchyma tissue, which prevents the insects from reaching the phloem for feeding. The discovery of the resistance gene Bph30 and its role in enhancing cellulose and hemicellulose synthesis sheds light on a novel mechanism for controlling planthoppers in rice. This fortified sclerenchyma-mediated resistance mechanism expands our understanding of plant-insect interactions.
Phloem-feeding insects cause massive losses in agriculture and horticulture. Host plant resistance to phloem-feeding insects is often mediated by changes in phloem composition, which deter insect settling and feeding and decrease viability. Here, we report that rice plant resistance to the phloem-feeding brown planthopper (BPH) is associated with fortification of the sclerenchyma tissue, which is located just beneath the epidermis and a cell layer or two away from the vascular bundle in the rice leaf sheath. We found that BPHs prefer to feed on the smooth and soft region on the surface of rice leaf sheaths called the long-cell block. We identified Bph30 as a rice BPH resistance gene that prevents BPH stylets from reaching the phloemdue to the fortified sclerenchyma. Bph30 is strongly expressed in sclerenchyma cells and enhances cellulose and hemicellulose synthesis, making the cell walls stiffer and sclerenchyma thicker. The structurally fortified sclerenchyma is a formidable barrier preventing BPH stylets from penetrating the leaf sheath tissues and arriving at the phloem to feed. Bph30 belongs to a novel gene family, encoding a protein with two leucine-rich domains. Another member of the family, Bph40, also conferred resistance to BPH. Collectively, the fortified sclerenchyma-mediated resistance mechanism revealed in this study expands our understanding of plant-insect interactions and opens a new path for controlling planthoppers in rice.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据