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S ymphyotrichum ericoides populations from seleniferous and nonseleniferous soil display striking variation in selenium accumulation
Symphyotrichum ericoides (Asteraceae) from naturally seleniferous habitat (Pine Ridge) was shown previously to have selenium (Se) hyperaccumulator properties in field and glasshouse studies, and to benefit from Se through protection from herbivory. To investigate whether Se hyperaccumulation is ubiq...
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Published in: | The New phytologist 2015-04, Vol.206 (1), p.231-242 |
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Main Authors: | , , |
Format: | Article |
Language: | English |
Citations: | Items that this one cites Items that cite this one |
Online Access: | Get full text |
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Summary: | Symphyotrichum ericoides
(Asteraceae) from naturally seleniferous habitat (Pine Ridge) was shown previously to have selenium (Se) hyperaccumulator properties in field and glasshouse studies, and to benefit from Se through protection from herbivory.
To investigate whether Se hyperaccumulation is ubiquitous in
S
. ericoides
or restricted to seleniferous soils, the
S
. ericoides
Pine Ridge (
PR
) population was compared with the nearby Cloudy Pass (
CP
) population from nonseleniferous soil.
The
S
. ericoides
PR
and
CP
populations were strikingly physiologically different: in a common garden experiment,
PR
plants accumulated up to 40‐fold higher Se concentrations than
CP
plants and had 10‐fold higher Se : sulfur (S) ratios. Moreover, roots of
S
. ericoides
PR
plants showed directional growth toward selenate, while
CP
roots did not. Growth of both accessions responded positively to Se. Each accession grew best on its own soil. Rhizosphere soil inoculum from the
S
. ericoides
PR
population stimulated plant growth and Se accumulation in both
S
. ericoides
PR
and
S
. ericoides
CP
plants, on both
PR
and
CP
soils.
While the
S
. ericoides
PR
population hyperaccumulates Se, the nearby
CP
population does not. The capacity of
S
. ericoides
PR
plants to hyperaccumulate Se appears to be a local phenomenon that is restricted to seleniferous soil. Mutualistic rhizosphere microbes of the
S
. ericoides
PR
population may contribute to the hyperaccumulation phenotype. |
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ISSN: | 0028-646X 1469-8137 |
DOI: | 10.1111/nph.13164 |