A comparison of partial dehydration and hydrated storage-induced changes in viability, reactive oxygen species production, and glutathione metabolism in two contrasting recalcitrant-seeded species

• Autorzy: Moothoo-Padayachie A. , Verghese B. , Pammenter N.W. , Govender P. , Sershen
• Języki publikacji: EN

Abstrakty

EN

This study compared the responses of Avicennia marina and Trichilia dregeana seeds, both of which are recalcitrant, to partial dehydration and storage. Seeds of A. marina exhibited a faster rate of water and viability loss (± 50% viability loss in 4 days) during partial dehydration, compared with T. dregeana (± 50% viability loss in 14 days). In A. marina embryonic axes, reactive oxygen species (ROS) production peaked on 4 days of dehydration and was accompanied by an increase in the GSH:GSSG ratio; it appears that the glutathione system alone could not overcome dehydration-induced oxidative stress in this species. In A. marina, ROS and axis water content levels increased during hydrated storage and were accompanied by a decline in the GSH:GSSG ratio and rapid viability loss. In T. dregeana embryonic axes, ROS production (particularly hydrogen peroxide) initially increased and thereafter decreased during both partial dehydration and hydrated storage. Unlike in A. marina embryonic axes, this reduced ROS production was accompanied by a decline in the GSH:GSSG ratio. While T. dregeana seeds may have incurred some oxidative stress during storage, a delay in and/or suppression of the ROS-based trigger for germination may account for their significantly longer storage longevity compared with A. marina. Mechanisms of desiccation-induced seed viability loss may differ across recalcitrant-seeded species based on the rate and extent to which they lose water during partial drying and storage. While recalcitrant seed desiccation sensitivity and, by implication, storage longevity are modulated by redox metabolism, the specific ROS and antioxidants that contribute to this control may differ across species.

• Wydawca: -
• Czasopismo: Acta Physiologiae Plantarum
• Rocznik: 2018
• Tom: 40
• Numer: 01
• Opis fizyczny: Article 14 [10p.[, fig.,ref.

Twórcy

autor

Moothoo-Padayachie A.

• School of Life Sciences, University of KwaZulu-Natal, Westville Campus, Private Bag X54001, Durban 4001, South Africa

autor

Verghese B.

• School of Life Sciences, University of KwaZulu-Natal, Westville Campus, Private Bag X54001, Durban 4001, South Africa

autor

Pammenter N.W.

• School of Life Sciences, University of KwaZulu-Natal, Westville Campus, Private Bag X54001, Durban 4001, South Africa

autor

Govender P.

• School of Life Sciences, University of KwaZulu-Natal, Westville Campus, Private Bag X54001, Durban 4001, South Africa

autor

Sershen

• School of Life Sciences, University of KwaZulu-Natal, Westville Campus, Private Bag X54001, Durban 4001, South Africa

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Identyfikatory

DOI

10.1007/s11738-017-2589-0