Metabolismo fotossintético e antioxidante em mudas de <i>Ormosia arborea</i> são modulados pelo ácido abscísico sob deficit hídrico?

O objetivo deste trabalho foi avaliar o efeito do ácido abscísico (ABA) nas trocas gasosas e na atividade de enzimas antioxidantes de mudas de Ormosia arborea (Vell.) Harms sob deficiência hídrica e sua influência no potencial de recuperação das mudas. O experimento foi conduzido com quatro tratamentos, sendo eles irrigação diária ou restrição hídrica sem e com 10 μM ABA. As mudas sob déficit hídrico + ABA apresentaram maior ajuste à seca e ao serem re-irrigadas restabeleceram o metabolismo fotossintético e o potencial hídrico. O ABA minimizou a redução do metabolismo fotossintético e do potencial da água na folha, porém, não aumentou a atividade antioxidante de mudas de O. arborea sob déficit hídrico. Esses resultados sugerem que esta espécie apresenta plasticidade fisiológica, o que lhe permite sobreviver em ambientes sujeitos a déficit hídrico temporário, independente da suplementação de ABA. Sugerimos que outras doses de ABA sejam avaliadas para ampliar os efeitos benéficos do ABA sobre esta espécie.

Palavras-chave:
trocas gasosas; enzimas antioxidantes; estresse hídrico; ABA

Autoria

S. S. Bastos

Universidade Federal da Grande Dourados – UFGD, Faculdade de Ciências Biológicas e Ambientais – FCBA, Dourados, MS, BrasilUniversidade Federal da Grande DouradosBrasilDourados, MS, BrasilUniversidade Federal da Grande Dourados – UFGD, Faculdade de Ciências Biológicas e Ambientais – FCBA, Dourados, MS, Brasil

https://orcid.org/0000-0002-4589-4445

S. P. Q. Scalon ^**e-mail: silvanascalon@ufgd.edu.br

Universidade Federal da Grande Dourados – UFGD, Faculdade de Ciências Agrárias – FCA, Dourados, MS, Brasil Universidade Federal da Grande DouradosBrasilDourados, MS, BrasilUniversidade Federal da Grande Dourados – UFGD, Faculdade de Ciências Agrárias – FCA, Dourados, MS, Brasil

https://orcid.org/0000-0003-2024-7695

A. P. R. Souza

https://orcid.org/0000-0001-8052-9139

D. M. Dresch

https://orcid.org/0000-0003-2287-5783

F. S. Junglos

L. Q. Scalon

https://orcid.org/0000-0001-7149-0527

R. M. Mussury

https://orcid.org/0000-0002-8961-9146

V. M. B. Freitas

https://orcid.org/0000-0002-0758-9570

*e-mail: silvanascalon@ufgd.edu.br

SCIMAGO INSTITUTIONS RANKINGS

Figuras

Figuras (6)

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Figure 1
Photosynthetic rate (A) – (A), transpiration rate (E); (B) and water use efficiency (A/E); (C) as a function of the evaluation days of Ormosia arborea irrigated seedlings (I and I 10 μM ABA) and submitted to water deficit conditions (SI and SI 10 μM ABA). Continuous vertical line indicates the periods of evaluation: time zero (T0), first null photosynthesis (1^st P0), second null photosynthesis (^2nd P0), recovery (REC) and final evaluation (END).

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Figure 2
Stomatal conductance (gs) – (A) internal CO₂ concentration (Ci); (B) and instantaneous carboxylation efficiency CO₂ (A/Ci); (C) of Ormosia arborea irrigated seedlings (I and I 10 μM ABA) and submitted to water deficit conditions (SI and SI 10 μM ABA). Continuous vertical line indicates the periods of evaluation: time zero (T0), first null photosynthesis (1^st P0), second null photosynthesis (2^nd P0), recovery (REC) and final evaluation (END).

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Figure 3
Water potential (Ψw) (A) and Potential efficiency quantum of photosystem II (Fv/Fm) (B) as a function of the evaluation periods between irrigated seedlings (I) of Ormosia arborea (I and I 10 μM ABA) and submitted to the water deficit condition (SI and SI 10 μM ABA). Lowercase letters compare the different treatments in the same evaluation period and uppercase letters compare the same treatment in the different evaluation periods.

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Figure 4
Activity of the catalase enzyme in leaf (A) and root (B) of Ormosia arborea seedlings irrigated (I and I 10 μM ABA) and submitted to water deficit conditions (SI and SI 10 μM ABA) in the different evaluation periods: zero time (T0), first null photosynthesis (1^st P0), second null photosynthesis (2^nd P0), recovery (REC) and final evaluation (END). Upper case letters differ between trial times and lowercase letters between treatments.

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Figure 5
Enzymatic activity of peroxidase in leaves (POD Leaves) (A) and roots (POD Roots) (B) of Ormosia arborea seedlings irrigated (I and I 10 μM ABA) and submitted to water deficit conditions (SI and SI 10 μM ABA) in the different evaluation periods: zero time (T0), first null photosynthesis (1^st P0), second null photosynthesis (2^nd P0), recovery (REC) and final evaluation (END). Upper case letters differ between trial times and lowercase letters between treatments.

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Figure 6
Enzymatic activity of superoxide dismutase in leaves (SOD Leaves) (A) and roots (SOD roots) (B) of Ormosia arborea seedlings irrigated (I and I 10 μM ABA) and submitted to water deficit conditions (SI and SI 10 μM ABA) in the different evaluation periods: zero time (T0), first null photosynthesis (1^st P0), second null photosynthesis (2^nd P0), recovery (REC) and final evaluation (END). Upper case letters differ between trial times and lowercase letters between treatments.

Figure 1 Photosynthetic rate (A) – (A), transpiration rate (E); (B) and water use efficiency (A/E); (C) as a function of the evaluation days of Ormosia arborea irrigated seedlings (I and I 10 μM ABA) and submitted to water deficit conditions (SI and SI 10 μM ABA). Continuous vertical line indicates the periods of evaluation: time zero (T0), first null photosynthesis (1^st P0), second null photosynthesis (^2nd P0), recovery (REC) and final evaluation (END).

Figure 2 Stomatal conductance (gs) – (A) internal CO₂ concentration (Ci); (B) and instantaneous carboxylation efficiency CO₂ (A/Ci); (C) of Ormosia arborea irrigated seedlings (I and I 10 μM ABA) and submitted to water deficit conditions (SI and SI 10 μM ABA). Continuous vertical line indicates the periods of evaluation: time zero (T0), first null photosynthesis (1^st P0), second null photosynthesis (2^nd P0), recovery (REC) and final evaluation (END).

Figure 3 Water potential (Ψw) (A) and Potential efficiency quantum of photosystem II (Fv/Fm) (B) as a function of the evaluation periods between irrigated seedlings (I) of Ormosia arborea (I and I 10 μM ABA) and submitted to the water deficit condition (SI and SI 10 μM ABA). Lowercase letters compare the different treatments in the same evaluation period and uppercase letters compare the same treatment in the different evaluation periods.

Figure 4 Activity of the catalase enzyme in leaf (A) and root (B) of Ormosia arborea seedlings irrigated (I and I 10 μM ABA) and submitted to water deficit conditions (SI and SI 10 μM ABA) in the different evaluation periods: zero time (T0), first null photosynthesis (1^st P0), second null photosynthesis (2^nd P0), recovery (REC) and final evaluation (END). Upper case letters differ between trial times and lowercase letters between treatments.

Figure 5 Enzymatic activity of peroxidase in leaves (POD Leaves) (A) and roots (POD Roots) (B) of Ormosia arborea seedlings irrigated (I and I 10 μM ABA) and submitted to water deficit conditions (SI and SI 10 μM ABA) in the different evaluation periods: zero time (T0), first null photosynthesis (1^st P0), second null photosynthesis (2^nd P0), recovery (REC) and final evaluation (END). Upper case letters differ between trial times and lowercase letters between treatments.

Figure 6 Enzymatic activity of superoxide dismutase in leaves (SOD Leaves) (A) and roots (SOD roots) (B) of Ormosia arborea seedlings irrigated (I and I 10 μM ABA) and submitted to water deficit conditions (SI and SI 10 μM ABA) in the different evaluation periods: zero time (T0), first null photosynthesis (1^st P0), second null photosynthesis (2^nd P0), recovery (REC) and final evaluation (END). Upper case letters differ between trial times and lowercase letters between treatments.

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