Growth and stress responses of Nuttall’s waterweed Elodea nuttallii (Planch) St. John to water movements

Atapaththu, Keerthi Sri Senarathna; Asaeda, Takashi

doi:10.1007/s10750-014-2141-9

Cited by 29 publications

(33 citation statements)

References 66 publications

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“…Thus, the plant body was strengthened (leaves and stem) with an increased epidermal cell wall thickness against the turbulence (Figs and ), and the remarkable increase in cell wall thickness in both leaves and stems of turbulence‐stressed plants suggested an adaptive mechanism to withstand the mechanical stress of turbulence. This observation was supported by our previous findings (Atapaththu & Asaeda ), in which plants accumulated cellulose and lignin together with radial expansion in response to water movements.…”

Section: Discussionsupporting

confidence: 90%

“…Therefore, the increasing trend in accumulation of GABA that was observed could be an adaptive mechanism to scavenge the excess ROS in stressed plants because turbulence causes oxidative stress in aquatic plants (Ellawala et al . ; Atapaththu & Asaeda ). The increase in GABA content, together with impaired growth as a consequence of turbulence, is consistent with previous literature (Braam ).…”

Section: Discussionmentioning

confidence: 99%

“…, ). The complete plasmolysis that was observed in leaves after exposure to high turbulence (Figs and ) might be responsible for the impaired growth in the turbulence‐stressed plants because the total chlorophyll content of E. nuttallii was reduced by approximately 40% with exposure to the mechanical stress of turbulence (Atapaththu & Asaeda ). Furthermore, an impaired photosystem II was reported for the same species, together with the formation of ROS (Atapaththu & Asaeda ), and chloroplasts are very sensitive to injury resulting from ROS (Dinakar et al .…”

Section: Discussionmentioning

confidence: 99%

“…In the natural environment, turbulence is one of the primary causes of mechanical stress exerted on submersed aquatic plants (Champika Ellawala et al . ; Atapaththu & Asaeda ). Although the stress responses of submersed plants to turbulence were reported previously (Champika Ellawala et al .…”

Section: Introductionmentioning

confidence: 99%

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Effects of water turbulence on variations in cell ultrastructure and metabolism of amino acids in the submersed macrophyte, Elodea nuttallii (Planch.) H. St. John

et al. 2015

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The interactions between macrophytes and water movement are not yet fully understood, and the causes responsible for the metabolic and ultrastructural variations in plant cells as a consequence of turbulence are largely unknown. In the present study, growth, metabolism and ultrastructural changes were evaluated in the aquatic macrophyte Elodea nuttallii, after exposure to turbulence for 30 days. The turbulence was generated with a vertically oscillating horizontal grid. The turbulence reduced plant growth, plasmolysed leaf cells and strengthened cell walls, and plants exposed to turbulence accumulated starch granules in stem chloroplasts. The size of the starch granules increased with the magnitude of the turbulence. Using capillary electrophoresis-mass spectrometry (CE-MS), analysis of the metabolome found metabolite accumulation in response to the turbulence. Asparagine was the dominant amino acid that was concentrated in stressed plants, and organic acids such as citrate, ascorbate, oxalate and γ-amino butyric acid (GABA) also accumulated in response to turbulence. These results indicate that turbulence caused severe stress that affected plant growth, cell ultrastructure and some metabolic functions of E. nuttallii. Our findings offer insights to explain the effects of water movement on the functions of aquatic plants.

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Section: Discussionsupporting

confidence: 90%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Effects of water turbulence on variations in cell ultrastructure and metabolism of amino acids in the submersed macrophyte, Elodea nuttallii (Planch.) H. St. John

et al. 2015

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“…All treatments were conducted in glass microcosms (15.7 × 15.7 × 24.5 cm), and 5% Hoagland nutrient solution (HNS), as recommended by Atapaththu and Asaeda (2015) for better growth of submerged macrophytes, was used as the nutrient media in the microcosms. To stimulate heat shock, the PVC pots with planted apical tips were directly transferred from the acclimatization tank to the pre-prepared glass microcosms set to temperatures of 25°C (as a control), 30°C and 35°C.…”

Section: Methodsmentioning

confidence: 99%

Effects of heat stress on growth, photosynthetic pigments, oxidative damage and competitive capacity of three submerged macrophytes

Silva

Asaeda

2017

Journal of Plant Interactions

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There is an information gap regarding heat stress-induced oxidative damage and the species-specific behavior of plants under stress conditions. The present study was designed with the hypothesis that heat stress may induce species-specific oxidative damage that determines the competitive capacity of common submerged macrophytes. We conducted two laboratory experiments to simulate mono-and mixed cultures of three submerged macrophytes with the application of two heat shock treatments. The results showed that both heat shocks had significant effects on growth, photosynthetic pigments and the ability to induce strong oxidative damage for all three species. The comparative results of mono-and mixed cultures showed that P. crispus had an advantage in both the control and hightemperature treatments over the other two species as a strong competitor in the mixed culture. Further, the competitive capacity of P. crispus increased in the moderately high-temperature condition compared to the control. ARTICLE HISTORY

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Effects of mechanical stressors caused by mean flow and turbulence on aquatic plants with different morphologies

2017

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Mean flow and turbulence are two significant factors that simultaneously affect aquatic plants.The tension from mean flow is unidirectional, whereas loads from turbulence fluctuate with the forces and pressures of different magnitude and direction. Our aim was to determine which water movement factor was most significant for habitat selection by submerged plants with different morphologies. The effects of mean flow and turbulence were tested with the whorled Elodea nuttallii, Potamogeton crispus, and leafy Vallisneria asiatica, controlling for other factors. A gradually constricted transparent pipe with plants in the middle was used in a recirculating tank to test the effects of the mean flow, and the effects of turbulence were examined by generating different turbulence levels in tanks with vertically oscillating grids. To determine plant response to these stressors, plant morphology, contents of cellulose, lignin, H 2 O 2 , pigments, indole acetic acid, and antioxidant activities were measured. Plant tissues were examined using transmission electron microscopy and light microscopy. At high turbulence levels, antioxidant activities and H 2 O 2 concentrations were significantly higher than in plants affected by mean flow or in stagnant water; thus, the physiological stress from turbulence was significantly higher regardless of morphology. V. asiatica benefited from mean flow, whereas whorled E. nuttallii and P. crispus were more stressed than plants in stagnant water. To withstand vigorous motion, accumulations of lignin and cellulose were high and cell ultrastructure was altered in plants exposed to high turbulence levels. Therefore, the physiology of submerged plants was affected more by turbulent motion than by mean flow.

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Growth and stress responses of Nuttall’s waterweed Elodea nuttallii (Planch) St. John to water movements

Cited by 29 publications

References 66 publications

Effects of water turbulence on variations in cell ultrastructure and metabolism of amino acids in the submersed macrophyte, Elodea nuttallii (Planch.) H. St. John

Effects of water turbulence on variations in cell ultrastructure and metabolism of amino acids in the submersed macrophyte, Elodea nuttallii (Planch.) H. St. John

Effects of heat stress on growth, photosynthetic pigments, oxidative damage and competitive capacity of three submerged macrophytes

Effects of mechanical stressors caused by mean flow and turbulence on aquatic plants with different morphologies

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