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Photosynthesis is differently regulated during and after copper-induced nutritional stress in citrus trees

Photosynthesis is differently regulated during and after copper-induced nutritional stress in citrus trees
Photosynthesis is differently regulated during and after copper-induced nutritional stress in citrus trees
Antioxidant enzymatic responses in Citrus leaves under Cu‐induced stress depends on rootstock genotypes. However, there is a lack of information about how woody plants recover growth capacity after exposure to elevated Cu and whether growth is affected by the redistribution of the metal to new vegetative parts and consequently whether photosynthesis is affected. Therefore, the biomass of plants and Cu concentrations in new leaf flushes were determined in young citrus trees grafted onto contrasting rootstocks [Swingle citrumelo (SW) and Rangpur lime (RL)]. Photosynthetic rate, chlorophyll fluorescence and antioxidant enzymatic systems were evaluated in plants previously grown in nutrient solution with Cu varying from low to high levels and with no added Cu. Both rootstocks exhibited reduced plant growth under Cu toxicity. However, trees grafted onto RL exhibited better growth recovery after Cu excess, which was dependent on the modulation of antioxidant enzyme activities in roots and leaves that maintained the integrity of the photosynthetic apparatus. In contrast, plants grafted onto SW exhibited a lower photosynthetic rate at the lowest available Cu concentration. Although the highest accumulation of Cu occurred in citrus roots, the redistribution of the nutrient to new vegetative parts was proportional to the Cu concentration in the roots.
0031-9317
Hippler, Franz W.r.
03b983a5-810a-4fb7-afc7-af9c5e2be74d
Dovis, Veronica L.
a1d426c6-5fc6-4ee0-9851-b157c2a9d0c7
Boaretto, Rodrigo M.
0852aa3b-1c86-4e43-8e13-e4d32e237845
Quaggio, Jose A.
7c145354-c4da-4c6b-9182-26615331e45b
Azevedo, Ricardo A.
c6ed3a9f-e890-4eab-afa7-a2ac0d5d1e08
Williams, Lorraine E.
79ee1856-3732-492b-8ac5-239749c85d9e
Mattos-jr, Dirceu
011a1da6-6049-45df-9087-8d74daa91ff3
Hippler, Franz W.r.
03b983a5-810a-4fb7-afc7-af9c5e2be74d
Dovis, Veronica L.
a1d426c6-5fc6-4ee0-9851-b157c2a9d0c7
Boaretto, Rodrigo M.
0852aa3b-1c86-4e43-8e13-e4d32e237845
Quaggio, Jose A.
7c145354-c4da-4c6b-9182-26615331e45b
Azevedo, Ricardo A.
c6ed3a9f-e890-4eab-afa7-a2ac0d5d1e08
Williams, Lorraine E.
79ee1856-3732-492b-8ac5-239749c85d9e
Mattos-jr, Dirceu
011a1da6-6049-45df-9087-8d74daa91ff3

Hippler, Franz W.r., Dovis, Veronica L., Boaretto, Rodrigo M., Quaggio, Jose A., Azevedo, Ricardo A., Williams, Lorraine E. and Mattos-jr, Dirceu (2018) Photosynthesis is differently regulated during and after copper-induced nutritional stress in citrus trees. Physiologia Plantarum. (doi:10.1111/ppl.12746).

Record type: Article

Abstract

Antioxidant enzymatic responses in Citrus leaves under Cu‐induced stress depends on rootstock genotypes. However, there is a lack of information about how woody plants recover growth capacity after exposure to elevated Cu and whether growth is affected by the redistribution of the metal to new vegetative parts and consequently whether photosynthesis is affected. Therefore, the biomass of plants and Cu concentrations in new leaf flushes were determined in young citrus trees grafted onto contrasting rootstocks [Swingle citrumelo (SW) and Rangpur lime (RL)]. Photosynthetic rate, chlorophyll fluorescence and antioxidant enzymatic systems were evaluated in plants previously grown in nutrient solution with Cu varying from low to high levels and with no added Cu. Both rootstocks exhibited reduced plant growth under Cu toxicity. However, trees grafted onto RL exhibited better growth recovery after Cu excess, which was dependent on the modulation of antioxidant enzyme activities in roots and leaves that maintained the integrity of the photosynthetic apparatus. In contrast, plants grafted onto SW exhibited a lower photosynthetic rate at the lowest available Cu concentration. Although the highest accumulation of Cu occurred in citrus roots, the redistribution of the nutrient to new vegetative parts was proportional to the Cu concentration in the roots.

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Hippler_et_al-2017-Physiologia_Plantarum - Accepted Manuscript
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Accepted/In Press date: 10 April 2018
e-pub ahead of print date: 17 April 2018

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Local EPrints ID: 419641
URI: http://eprints.soton.ac.uk/id/eprint/419641
ISSN: 0031-9317
PURE UUID: f39026d6-4f3d-45f9-a13f-763432be675c

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Date deposited: 18 Apr 2018 16:30
Last modified: 26 Nov 2021 05:10

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Contributors

Author: Franz W.r. Hippler
Author: Veronica L. Dovis
Author: Rodrigo M. Boaretto
Author: Jose A. Quaggio
Author: Ricardo A. Azevedo
Author: Dirceu Mattos-jr

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