Combined Effects of Warming and Shading on Growth and Photosynthetic Performance of Submerged Macrophytes From Songkhla Lagoon, Thailand

Chotikarn, Ponlachart; Kaewchana, P.; Roekngandee, P.; Pramneechote, Pathompong; Prathep, Anchana; Sinutok, Sutinee

doi:10.15666/aeer/1903_25752592

Cited by 2 publications

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“…Excessive photosynthetically active radiation (PAR) and a high air temperature during midday might lead to the downregulation of photosynthesis and a change in the balance of energy absorption and dissipation of PSII, resulting in photoprotection against photodamage [ 16 ]. This is consistent with the results of the study conducted by Chotikarn et al [ 29 ], reporting that an elevated temperature of 36 °C resulted in the downregulation of photosynthesis in C. demersum . Such high air and water temperatures might degrade photosystem II in the photosynthetic apparatus [ 29 ].…”

Section: Discussionsupporting

confidence: 93%

“…This is consistent with the results of the study conducted by Chotikarn et al [ 29 ], reporting that an elevated temperature of 36 °C resulted in the downregulation of photosynthesis in C. demersum . Such high air and water temperatures might degrade photosystem II in the photosynthetic apparatus [ 29 ]. Furthermore, the recovery of F v /F m at 6 p.m. indicated the reversible photoinhibition, effective photoprotection, and photoadaptation of PSII of these macrophyte species.…”

Section: Discussionsupporting

confidence: 93%

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Photosynthetic Responses of Freshwater Macrophytes to the Daily Light Cycle in Songkhla Lagoon

Chotikarn

Pramneechote

Sinutok

2022

Plants

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Macrophytes play an important role in the freshwater ecosystem. However, human activities and climate change are currently affecting aquatic lakes and species in various ways. The heterogeneity of macrophyte ecophysiology might lead to different responses to changing environments. To understand the photosynthetic responses of freshwater macrophytes to changes in light, six freshwater macrophyte species from Songkhla Lagoon were investigated. The results showed that there was a diurnal response of photosynthetic activities in all species. The Fv/Fm and ∆F/Fm′ of all species decreased at midday (9 a.m.–3 p.m.) then recovered at 6 p.m. close to the 6 a.m. level. As well as alpha, the positive relation between alpha and light showed the adaptation of plants. The saturating irradiance (Ik) revealed that plants from different light regimes showed different responses to light and temperature changes. To maintain a positive carbon balance and cope with light and temperature conditions, macrophytes had strategies such as modifying light harvesting capacity and light use. This study provides a better understanding of the vulnerability of each species to environmental changes and photosynthetic responses that enable species from different light regime to adapt to changing light environments.

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Section: Discussionsupporting

confidence: 93%

Section: Discussionsupporting

confidence: 93%

Photosynthetic Responses of Freshwater Macrophytes to the Daily Light Cycle in Songkhla Lagoon

Chotikarn

Pramneechote

Sinutok

2022

Plants

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“…Therefore, in order to meet their growth requirements, plants need to grow vigorously to approach the water surface and acquire enough light for photosynthesis. Increased branching, higher leaf numbers, and longer leaf length enables plants to occupy a wide range of ecological niches and gain a distinctive advantage in capturing light energy resources [ 45 , 46 ]. Under low light conditions, plants tend to lengthen their stems and leaves to acquire more light energy, while under high light intensity, they tend to reduce stem length and leaf area to avoid damage from excessive light [ 12 , 47 ].…”

Section: Discussionmentioning

confidence: 99%

Which Has a Greater Impact on Plant Functional Traits: Plant Source or Environment?

Xian,

Yang,

Muthui

et al. 2024

Plants

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The deterioration of water quality caused by human activities has triggered significant impacts on aquatic ecosystems. Submerged macrophytes play an important role in freshwater ecosystem restoration. Understanding the relative contributions of the sources and environment to the adaptive strategies of submerged macrophytes is crucial for freshwater restoration and protection. In this study, the perennial submerged macrophyte Myriophyllum spicatum was chosen as the experimental material due to its high adaptability to a variable environment. Through conducting reciprocal transplant experiments in two different artificial environments (oligotrophic and eutrophic), combined with trait network and redundancy analysis, the characteristics of the plant functional traits were examined. Furthermore, the adaptive strategies of M. spicatum to the environment were analyzed. The results revealed that the plant source mainly influenced the operational pattern among the traits, and the phenotypic traits were significantly affected by environmental factors. The plants cultured in high-nutrient water exhibited a higher plant height, longer leaves, and more branches and leaves. However, their physiological functions were not significantly affected by the environment. Therefore, the adaptation strategy of M. spicatum to the environment mainly relies on its phenotypic plasticity to ensure the moderate acquisition of resources in the environment, thereby ensuring the stable and efficient operation of plant physiological traits. The results not only offered compelling evidence on the adaptation strategies of M. spicatum in variable environments but also provided theoretical support for the conservation of biodiversity and sustainable development.

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Combined Effects of Warming and Shading on Growth and Photosynthetic Performance of Submerged Macrophytes From Songkhla Lagoon, Thailand

Cited by 2 publications

References 0 publications

Photosynthetic Responses of Freshwater Macrophytes to the Daily Light Cycle in Songkhla Lagoon

Photosynthetic Responses of Freshwater Macrophytes to the Daily Light Cycle in Songkhla Lagoon

Which Has a Greater Impact on Plant Functional Traits: Plant Source or Environment?

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