Liečivé rastliny v meniacich sa environmentálnych podmienkach

Vliv abiotických a biotických stresorů na vlastnosti rostlin 11.5.2005
Literatúra
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Structure of the root of Thlaspi spp. in relation to cadmium sensitivity and
hyperaccumulation
Key words: cadmium, réseau sus-endodermique, root structure, Thlaspi
Summary
Thlaspi caerulescens and Thlaspi arvense are closely related species with contrasting
characteristics of cadmium tolerance and accumulation. T. arvense is a common weed
sensitive to cadmium, and T. caerulescens is known as a tolerant plant which can
hyperaccumulate cadmium, zinc and nickel. Plants of both species were grown in
hydroponics containing 10 -4 M Ca(NO 3 ) 2 (-control) a 10 -6 M Cd(NO 3 ) 2 .4 H 2 O + 10 -4 M
Ca(NO 3 ) 2 .4 H 2 O (-Cd variant) over a period of three weeks. Apical segments of roots were
examined using light and fluorescent microscopy. Root structure in both species is very
similar. Differences were observed particularly in development of cell wall modifications
(lignification and suberinization) in two innermost layers of cortex. Cadmium negatively
affected root growth and accelerated cell wall modifications in cortex. Another difference
between Cd variants was in conspicuous vacuolisation of cells in meristematic zone in T.
arvense. Possible link of these interspecific differences with metal tolerance and
accumulation should be investigated.
Poďakovanie
Táto práca je súčasťou riešenia grantových projektov 1/0100/03 Slovenskej grantovej agentúry
VEGA, UK/238/2004 Komenského univerzity v Bratislave a COST 859.
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