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Glucosinolates (GS) are important secondary plant metabolites present in several plant species, including Arabidopsis thaliana (L.) Heynh. Although genotypic differences among a limited number of samples from a limited geographical range have been reported, there have been few studies exploring the variation from a wider genetic base. The objective of this study was to explore the genetic variation for GS in A. thaliana collected throughout the world. We screened 58 A. thaliana ecotypes collected from the geographic area of lat. 158 N to lat. 598 N and long. 1378 E to long. 1238 W. Elevation in these areas ranged from sea level to over 480 m. We believe that this study has covered a large geographical region and captured most of the available genetic variation in A. thaliana for GS. There was no geographical trend in A. thaliana shoot or seed tissue for GS concentration. Total shoot GS ranged from 1.1 to 52.8 mmolg -1 dry weight (DW), averaging 9.3 mmolg -1 DW among all ecotypes. Total seed GS ranged from 1.6 to 41.8 mmolg -1 DW with an average of 16.8 mmolg -1 DW among all ecotypes. Low and high GS-accumulating A. thaliana ecotypes identified in this study may provide a basis for further genetic analysis for GS metabolism. Information provided may also prove useful for improving concentrations of nutritionally beneficial GS in vegetable Brassicas. Glucosinolates (GS) are important sulfur- containing secondary metabolites present in a number of plant species, includingArabidopsis thaliana (L.) Heynh (Halkier and Du, 1997). More than 100 types of GS have been reported in plant species with 23 different types present inA.thaliana. The family Brassicaceae, of which A. thaliana is a member, represents a diverse group of plant species commercially important in many parts of the world. The plants produce condiment mustard; leafy, stored, processed, and picked vegetables; seed oils for margarine, salad oils, cooking oils, and industrial uses; animal fodders; and green manure crops (Williams and Hill, 1986). Isothiocyanate compounds produced in these plants through hydrolysis of GS by the en- zyme myrosinase convey their unique flavor and volatile attributes, and they can also act as antioxidants and anticancer agents when con- sumed in the diet. The presence is GS in A. thaliana offers the opportunity to study the biochemical pathways of these compounds in a widely used model plant system. Informa- tion gained from A. thaliana may shed new light on impact of GS and their hydrolysis products in chronic disease prevention. Glucosinolates demonstrate anticancer properties through the production of detoxifi- cation enzymes formed during hydrolysis such as quinine reductase, glutathione-S-transferase,

Diversity Analysis of Arabidopsis thaliana (L.) Heynh Ecotypes for Glucosinolates in Shoots and Seeds