Effect of in Situ Experimental Shading on the Photosynthesis of Canadian Waterweed (Elodea Canadensis) From Songkhla Lagoon, Thailand

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

doi:10.15666/aeer/1903_25932604

Cited by 1 publication

(1 citation statement)

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“…To adapt to low-light environments, submerged macrophytes with flat leaves presented greater leaf areas, leaf dry weights, specific leaf areas, and Fv/Fm ratios, while those with needle leaves had greater Chl a/b ratios [3]. Shading had no significant effect on the Chl contents of waterweed over 8 weeks but significantly elevated Chl contents after 10 weeks [37]. Importantly, light reduction might affect submerged macrophytes' relative growth rate by decreasing it, increasing it, or affecting it not at all depending on different species and percentage of light reduction [28,34,[38][39][40].…”

Section: Introductionmentioning

confidence: 89%

Response of Growth-Related Traits of Submerged Macrophytes to Light Reduction: A Meta-Analysis

Gao

Wang

et al. 2023

Sustainability

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Underwater light reduction is presumably becoming more frequent and intensified due to eutrophication and algal blooms, which may significantly affect submerged macrophytes’ growth. However, a comprehensive understanding of how light reduction influences growth-related traits and responses is currently lacking. Here, we compiled data from 333 records of 62 published works that used controlled experiments to explore the responses of functional traits associated with growth to light reduction. Our results indicated that light reduction significantly decreased the relative growth rate (RGR), ramet number (RM), shoot biomass (SB), root biomass (RB), soluble carbohydrates (SC), and leaf number (LN) by 38.2%, 60.0%, 59.2%, 55.4%, 30.0%, and 56.1%, respectively, but elevated the chlorophyll content (Chl) by 25.8%. Meanwhile, the responses of RGR to light reduction increased significantly with the responses of RM, SB, RB, and root-to-shoot ratio (R/S). Considering the relationships among the growth-related traits, we further found that the responses of RGR to light reduction were mainly driven by the RM rather than leaf photosynthetic capability, indicating the importance of tiller ability under low light stress. We also identified a tipping point of the response of RGR to light reduction, which might be incorporated into hydrophyte dynamic models to improve precision. Our results highlight the importance of growth-related traits, andthese traits may need to be incorporated into models to improve the prediction of distribution and area for submerged species or to provide guidance for the restoration and sustainable development of aquatic ecosystems.

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