Reciprocal grafting separates the roles of the root and shoot in zinc hyperaccumulation in Thlaspi caerulescens
MA GuimarŃes, JL Gustin, DE Salt - New Phytologist, 2009 - Wiley Online Library
MA GuimarŃes, JL Gustin, DE Salt
New Phytologist, 2009•Wiley Online LibraryThe extreme phenotype of zinc (Zn) hyperaccumulation, which is found in several
Brassicaceae species, is determined by mechanisms that promote elevated Zn tolerance
and high Zn accumulation in shoots.• We used reciprocal grafting between a Zn
hyperaccumulator, Thlaspi caerulescens, and a Zn nonaccumulator, Thlaspi perfoliatum, to
determine the relative importance of roots and shoots in Zn hyperaccumulation and
hypertolerance.• Leaves from plants with a T. áperfoliatum rootstock and a T. ácaerulescens …
Brassicaceae species, is determined by mechanisms that promote elevated Zn tolerance
and high Zn accumulation in shoots.• We used reciprocal grafting between a Zn
hyperaccumulator, Thlaspi caerulescens, and a Zn nonaccumulator, Thlaspi perfoliatum, to
determine the relative importance of roots and shoots in Zn hyperaccumulation and
hypertolerance.• Leaves from plants with a T. áperfoliatum rootstock and a T. ácaerulescens …
Summary
- • The extreme phenotype of zinc (Zn) hyperaccumulation, which is found in several Brassicaceae species, is determined by mechanisms that promote elevated Zn tolerance and high Zn accumulation in shoots.
- • We used reciprocal grafting between a Zn hyperaccumulator, Thlaspi caerulescens, and a Zn nonaccumulator, Thlaspi perfoliatum, to determine the relative importance of roots and shoots in Zn hyperaccumulation and hypertolerance.
- • Leaves from plants with a T.áperfoliatum rootstock and a T.ácaerulescens shoot scion did not hyperaccumulate Zn, whereas plants with a T.ácaerulescens rootstock and a T.áperfoliatum shoot scion did hyperaccumulate Zn. However, although leaves from plants with a T.ácaerulescens rootstock and a T.áperfoliatum shoot scion hyperaccumulated Zn, at high Zn loads these leaves showed significant symptoms of Zn toxicity, unlike leaves of self grafted T.ácaerulescens.
- • Hyperaccumulation of Zn in leaves of the hyperaccumulator T.ácaerulescens is pri‐marily dictated by root processes. Further, the mechanisms controlling Zn hypertolerance in the hyperaccumulator T.ácaerulescens are driven primarily by shoot processes.
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