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Plant Physiol, June 2001, Vol. 126, pp. 890-898
The TASTY Locus on Chromosome 1 of Arabidopsis
Affects Feeding of the Insect Herbivore Trichoplusia
ni1
Georg
Jander,2
Jianping
Cui,
Betty
Nhan,
Naomi
E.
Pierce, and
Frederick M.
Ausubel*
Department of Molecular Biology, Massachusetts General Hospital,
Boston, Massachusetts 02114 (G.J., F.M.A.); and Department of
Organismic and Evolutionary Biology, Harvard University, Cambridge,
Massachusetts 02138 (J.C., B.N., N.E.P.)
The generalist insect herbivore Trichoplusia ni
(cabbage looper) readily consumes Arabidopsis and can complete its
entire life cycle on this plant. Natural isolates (ecotypes) of
Arabidopsis are not equally susceptible to T. ni feeding.
While some are hardly touched by T. ni, others are eaten
completely to the ground. Comparison of two commonly studied
Arabidopsis ecotypes in choice experiments showed that Columbia is
considerably more resistant than Landsberg erecta. In
no-choice experiments, where larvae were confined on one or the other
ecotype, weight gain was more rapid on Landsberg erecta
than on Columbia. Genetic mapping of this difference in insect
susceptibility using recombinant inbred lines resulted in the discovery
of the TASTY locus near 85 cM on chromosome 1 of
Arabidopsis. The resistant allele of this locus is in the Columbia ecotype, and an F1 hybrid has a sensitive phenotype
that is similar to that of Landsberg erecta. The
TASTY locus is distinct from known genetic differences
between Columbia and Landsberg erecta that affect
glucosinolate content, trichome density, disease resistance, and
flowering time.
1
This work was supported by a National Research
Service Award (no. GM18735 to G.J.) and by the National Institutes of
Health (grant no. GM48707 to F.M.A.).
2
Present address: Cereon Genomics, 45 Sidney Street,
Cambridge, MA 02139.
*
Corresponding author; e-mail ausubel{at}frodo.mgh.harvard.edu; fax
617-726-5949.
© 2001 American Society of Plant Physiologists
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