Silicon enhances leaf remobilization of iron in cucumber under limited iron conditions
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Silicon enhances leaf remobilization of iron in cucumber under limited iron conditions. / Pavlovic, Jelena; Samardzic, Jelena; Kostic, Ljiljana; Laursen, Kristian Holst; Natic, Maja; Timotijevic, Gordana; Schjørring, Jan Kofod; Nikolic, Miroslav.
In: Annals of Botany, Vol. 118, No. 2, 2016, p. 271-280.Research output: Contribution to journal › Journal article › Research › peer-review
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TY - JOUR
T1 - Silicon enhances leaf remobilization of iron in cucumber under limited iron conditions
AU - Pavlovic, Jelena
AU - Samardzic, Jelena
AU - Kostic, Ljiljana
AU - Laursen, Kristian Holst
AU - Natic, Maja
AU - Timotijevic, Gordana
AU - Schjørring, Jan Kofod
AU - Nikolic, Miroslav
N1 - © The Author 2016. Published by Oxford University Press on behalf of the Annals of Botany Company. All rights reserved. For Permissions, please email: journals.permissions@oup.com.
PY - 2016
Y1 - 2016
N2 - BACKGROUND AND AIMS: Retranslocation of iron (Fe) from source tissues enhances plant tolerance to Fe deficiency. Previous work has shown that silicon (Si) can alleviate Fe deficiency by enhancing acquisition and root to shoot translocation of Fe. Here the role of Si in Fe mobilization in older leaves and the subsequent retranslocation of Fe to young leaves of cucumber (Cucumis sativus) plants growing under Fe-limiting conditions was investigated.METHODS: Iron ((57)Fe or naturally occurring isotopes) was measured in leaves at different positions on plants hydroponically growing with or without Si supply. In parallel, the concentration of the Fe chelator nicotianamine (NA) along with the expression of nicotianamine synthase (NAS) involved in its biosynthesis and the expression of yellow stripe-like (YSL) transcripts mediating Fe-NA transport were also determined.KEY RESULTS: In plants not receiving Si, approximately half of the total Fe content remained in the oldest leaf. In contrast, Si-treated plants showed an almost even Fe distribution among leaves with four different developmental stages, thus providing evidence of enhanced Fe remobilization from source leaves. This Si-stimulated Fe export was paralleled by an increased NA accumulation and expression of the YSL1 transporter for phloem loading/unloading of the Fe-NA complex.CONCLUSIONS: The results suggest that Si enhances remobilization of Fe from older to younger leaves by a more efficient NA-mediated Fe transport via the phloem. In addition, from this and previous work, a model is proposed of how Si acts to improve Fe homeostasis under Fe deficiency in cucumber.
AB - BACKGROUND AND AIMS: Retranslocation of iron (Fe) from source tissues enhances plant tolerance to Fe deficiency. Previous work has shown that silicon (Si) can alleviate Fe deficiency by enhancing acquisition and root to shoot translocation of Fe. Here the role of Si in Fe mobilization in older leaves and the subsequent retranslocation of Fe to young leaves of cucumber (Cucumis sativus) plants growing under Fe-limiting conditions was investigated.METHODS: Iron ((57)Fe or naturally occurring isotopes) was measured in leaves at different positions on plants hydroponically growing with or without Si supply. In parallel, the concentration of the Fe chelator nicotianamine (NA) along with the expression of nicotianamine synthase (NAS) involved in its biosynthesis and the expression of yellow stripe-like (YSL) transcripts mediating Fe-NA transport were also determined.KEY RESULTS: In plants not receiving Si, approximately half of the total Fe content remained in the oldest leaf. In contrast, Si-treated plants showed an almost even Fe distribution among leaves with four different developmental stages, thus providing evidence of enhanced Fe remobilization from source leaves. This Si-stimulated Fe export was paralleled by an increased NA accumulation and expression of the YSL1 transporter for phloem loading/unloading of the Fe-NA complex.CONCLUSIONS: The results suggest that Si enhances remobilization of Fe from older to younger leaves by a more efficient NA-mediated Fe transport via the phloem. In addition, from this and previous work, a model is proposed of how Si acts to improve Fe homeostasis under Fe deficiency in cucumber.
KW - Journal Article
U2 - 10.1093/aob/mcw105
DO - 10.1093/aob/mcw105
M3 - Journal article
C2 - 27371693
VL - 118
SP - 271
EP - 280
JO - Annals of Botany
JF - Annals of Botany
SN - 0305-7364
IS - 2
ER -
ID: 169105609