STRATEGIES OF TOMATO AND BEAN-PLANTS TOLERANCE TO ARSENIC

Arsenic (As) upward transport from roots was limited by its high toxic ity for the radicular and transporter cells. Tomato plants caused an i ncreasing accumulation of arsenic in roots as a strategy for increasin g plant tolerance to arsenic; the ratio As in root/As in the aerial pa rt was 69/1. However, bean plants limited the absorption of arsenic by roots, but there was not a limited transport of the absorbed arsenic; the ratio As in roots/As in shoots is 1/1.