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Regulation of the photosynthetic electron transport and specific photoprotective mechanisms in Ricinus communis under drought and recovery

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Abstract

Ricinus communis is one of the major commercial non-edible oilseed crops grown in semiarid and arid environments worldwide and is reported as a drought tolerant species. Surprisingly, little is known about the mechanisms achieving this tolerance, especially in relation to photoprotection. The aim of this study was to analyze the association of the regulation of the photosynthetic electron transport and photoprotective mechanisms with drought tolerance in R. communis. Drought induced decreases in the relative water content, water potential and growth in R. communis exposed to 9 days of drought. After 6 days of rehydration, these parameters were completely recovered, demonstrating a potential of drought tolerance in this species. In addition, drought inhibited photosynthesis by stomatal and metabolic limitations (V cmax, J max, and Rubisco activity), with partial recovery after rehydration. Leaves displayed transient photoinhibition after 6 days of drought, which was completely recovered after 6 days of dehydration. The effective quantum yields and the electron transport rates of PSII and PSI were modulated to face drought avoiding the excess energy produced by decreases in CO2 assimilation. NPQ was increased during drought, and it was maintained higher than control after the recovery treatment. In addition, the estimated cyclic electron flow was induced under drought and decreased after recovery. Photorespiration was also increased under drought and maintained at higher levels after the recovery treatment. Furthermore, antioxidative enzymes activities (SOD, APX, and CAT) were increased under drought to avoid ROS harmful effects. Altogether, we clearly showed that the modulation of photoprotective mechanisms and antioxidant enzymes are crucial to this species under drought. The implication of these strikingly strategies to drought tolerance is discussed in relation to agricultural and natural systems.

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Abbreviations

Ψ w :

Water potential

APX:

Ascorbate peroxidase

CAT:

Catalase

CEF:

Cyclic electron flow

DM:

Dry matter

FM:

Fresh matter

GO:

Glycolate oxidase

LEF:

Linear electron flow

PET:

Photosynthetic electron transport

PPFD:

Photosynthetic photon flux density

P R :

Photorespiration

ROS:

Reactive oxygen species

RuBP:

Ribulose 1,5 bisphosphate

RWC:

Relative water content

PSI:

Photosystem I

PSII:

Photosystem II

SOD:

Superoxide dismutase

TBARS:

Thiobarbituric acid reactive substances

VPD:

Vapor pressure deficit

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Acknowledgements

We are grateful to CNPq (Project 445842/2014-8) and INCTsal-CNPQ/MCTi for financial support and EMPRABA-Cotton by kindly provide the seeds.

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Correspondence to Milton C. Lima Neto.

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The authors declare that they have no conflict of interest.

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Communicated by M. Garstka.

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Lima Neto, M.C., Silveira, J.A.G., Cerqueira, J.V.A. et al. Regulation of the photosynthetic electron transport and specific photoprotective mechanisms in Ricinus communis under drought and recovery. Acta Physiol Plant 39, 183 (2017). https://doi.org/10.1007/s11738-017-2483-9

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  • DOI: https://doi.org/10.1007/s11738-017-2483-9

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