Entomologia Experimentalis et Applicata (2000) 96, 275-279

Xinzhi Ni and Sharron S. Quisenberry (2000)
Comparison of DIMBOA concentrations among wheat isolines and corresponding plant introduction lines
Entomologia Experimentalis et Applicata 96 (3), 275-279
Abstract: The concentration of a hydroxamic acid, also known as DIMBOA (2,4-dihydroxy-7-methoxy-1, 4-benzoxazin-3-one), in 6-d old wheat seedlings was examined using reverse-phase high performance liquid chromatography (HPLC). Wheat plant introduction (PI) lines PI 137739 (Dn1 gene), PI 262660 (Dn2 gene), and PI 294994 (Dn5 gene), the corresponding near-isogenic lines'Betta'-Dn1, Betta-Dn2 and Betta-Dn5, and susceptible Betta wheat were used in the study. The Dn2 gene conferring Russian wheat aphid, Diuraphis noxia (Mordvilko) (Hemiptera: Aphididae), tolerance was not related to DIMBOA concentration in wheat. Of the lines with Dn1 and Dn5 genes that confer antibiosis to D. noxia, only lines with the Dn5 gene showed increased DIMBOA accumulation. However, the Dn5 and the DIMBOA biosynthesis genes are not located in the same chromosome group. Possible relationship between the Dn5 gene and DIMBOA accumulation was discussed. This study indicates that DIMBOA concentration does not completely explain D. noxia resistance in the wheat lines examined and a comprehensive examination of other allelochemicals (e.g., phenolics) is necessary.
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Database assignments for author(s): Xinzhi Ni

Research topic(s) for pests/diseases/weeds:
resistance/tolerance/defence of host

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Diuraphis noxia	Wheat (Triticum)