Immunolocalization and Ultrastructure Show Ingestion of Cry Protein Expressed in Glycine max by Heterodera glycines and Its Mode of Action.

Autor:	Berg RH; Advanced Bioimaging Laboratory, Donald Danforth Plant Science Center, St. Louis, MO 63132, U.S.A., Kahn TW; Innatrix, Research Triangle Park, NC 27709, U.S.A., McCarville MT; BASF Corporation, Research Triangle Park, NC 27709, U.S.A., Williams J; BASF Corporation, Research Triangle Park, NC 27709, U.S.A., Czymmek KJ; Advanced Bioimaging Laboratory, Donald Danforth Plant Science Center, St. Louis, MO 63132, U.S.A., Daum J; BASF Corporation, Research Triangle Park, NC 27709, U.S.A.
Jazyk:	angličtina
Zdroj:	Molecular plant-microbe interactions : MPMI [Mol Plant Microbe Interact] 2024 Oct; Vol. 37 (10), pp. 701-711. Date of Electronic Publication: 2024 Oct 16.
DOI:	10.1094/MPMI-02-24-0021-R
Abstrakt:	Great interest exists in developing a transgenic trait that controls the economically important soybean ( Glycine max ) pest, soybean cyst nematode (SCN, Heterodera glycines ), due to its adaptation to native resistance. Soybean plants expressing the Bacillus thuringiensis delta-endotoxin, Cry14Ab, were recently demonstrated to control SCN in both growth chamber and field testing. In that communication, ingestion of the Cry14Ab toxin by SCN second stage juveniles (J2s) was demonstrated using fluorescently labeled Cry14Ab in an in vitro assay. Here, we show that consistent with expectations for a Cry toxin, Cry14Ab has a mode of action unique from the native resistance sources Peking and PI 88788. Further, we demonstrate in planta the ingestion and localization of the Cry14Ab toxin in the midgut of nematodes feeding on roots expressing Cry14Ab using immunogold labeling and transmission electron microscopy. We observed immunolocalization of the toxin and resulting intestinal damage primarily in the microvillus-like structure (MvL)-containing region of the midgut intestine but not in nematodes feeding on roots lacking toxin. This demonstrated that Cry14Ab was taken up by the J2 SCN, presumably through the feeding tube within the plant root cell that serves as its feeding site. This suggests that relatively large proteins can be taken up through the feeding tube. Electron microscopy showed that Cry14Ab caused lysis of the midgut MvL membrane and eventual degradation of the MvL and the lysate, forming particulate aggregates. The accumulated electron-dense aggregate in the posterior midgut intestine was not observed in SCN in nonCry14Ab-expressing plants. [Formula: see text] Copyright © 2024 The Author(s). This is an open access article distributed under the CC BY-NC-ND 4.0 International license. Competing Interests: R.H.B. worked on this project as a paid consultant for the BASF Corporation (BASF). M.T.M., J.W., and J.D. are employed by BASF, whose products are evaluated in this study. The remaining authors declare no conflict of interest.
Databáze:	MEDLINE
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