Abstract
When lepidopteran larvae feed on the insect-resistant maize genotype Mp708 there is a rapid accumulation of a defensive cysteine protease, Maize insect resistance 1-cysteine protease (Mir1-CP), at the feeding site. Silver-enhanced immunolocalization visualized with both light and transmission electron microscopy was used to determine the location of Mir1-CP in the maize leaf. The results indicated that Mir1-CP is localized predominantly in the phloem of minor and intermediate veins. After 24 h of larval feeding, Mir1-CP increased in abundance in the vascular parenchyma cells and in the thick-walled sieve element (TSE); it was also found localized to the bundle sheath and mesophyll cells. In situ hybridization of mRNA encoding Mir1-CP indicated that the primary sites of Mir1-CP synthesis in the whorl are the vascular parenchyma and bundle sheath cells. In addition to the phloem, Mir1-CP was also found in the metaxylem of the leaf and root. After 24 h of foliar feeding, the amount of Mir1-CP in the root xylem increased and it appeared to move from xylem parenchyma into the root metaxylem elements. The accumulation of Mir1-CP in maize vascular elements suggests Mir1-CP may move through these tissues to defend against insect herbivores.
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Abbreviations
- Mir1-CP:
-
Maize insect resistance 1-cysteine protease
- FAW:
-
Fall armyworm
- TSE:
-
Thick-walled sieve elements
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Acknowledgments
We thank Bill Monroe and Amanda Lawrence (Mississippi State University Electron Microscope Center) for their generous help and technical assistance. This research was supported by grant to DSL by the Life Sciences and Biotechnology Institute at Mississippi State University and the National Science Foundation (IBN-0236150). This is report J10807 of the Mississippi Agricultural and Forestry Experiment Station.
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Lorena Lopez and Alberto Camas contributed equally to the research and preparation of this manuscript.
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Lopez, L., Camas, A., Shivaji, R. et al. Mir1-CP, a novel defense cysteine protease accumulates in maize vascular tissues in response to herbivory. Planta 226, 517–527 (2007). https://doi.org/10.1007/s00425-007-0501-7
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DOI: https://doi.org/10.1007/s00425-007-0501-7