Benefits of clonal integration between interconnected ramets of Vallisneria spiralis in heterogeneous light environments

Xiao, Keyan; Yu, Dan; Xu, Xinglong; Wen, Xishan

doi:10.1016/j.aquabot.2006.08.001

Cited by 32 publications

(28 citation statements)

References 33 publications

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“…Indeed, a CO 2 increase of 2 to 10 times the ambient level was previously shown to promote biomass accumulation of submerged macrophytes in multiple previous studies at various pH levels (Titus 1992, Olesen & Madsen 2000, Yan et al 2006, Malheiro et al 2013. Clonal reproduction is the major reproduction and dispersal method of Vallisneria species (Xiao et al 2006(Xiao et al , 2007a(Xiao et al , 2011. In the present study, longer creeping stems and a greater ramet number were observed under elevated CO 2 conditions, which is consistent with previous studies; this clonal growth enables Vallis neria species to occupy more habitats (Yan et al 2006).…”

Section: Discussionsupporting

confidence: 92%

“…When inorganic carbon is no longer a limiting factor, nutrient intake will likely be more important than photosynthesis as a result of carbohydrate production, and roots may therefore be emphasized over leaves (Titus & An dorfer 1996, Geng et al 2004). Additionally, greater resource allocation to creeping stems may allow V. natans to capture more resources, and reduce competition for soil nutrients with neighboring plants (Xiao et al 2006, 2007a, Yan et al 2006, and more buds will likely lead to higher productivity in waters with high CO 2 concentrations.…”

Section: Discussionmentioning

confidence: 99%

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Responses of the submerged macrophyte Vallisneria natans to elevated CO2 and temperature

Cao¹,

Ruan²

2015

Aquat. Biol.

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Inorganic carbon and temperature are 2 important factors that regulate the growth of submerged macrophytes. However, experimental evidence regarding the eco-physiological changes that occur in submerged macrophytes in response to elevated CO 2 and temperature is still limited. To investigate how the submerged macrophyte Vallisneria natans (Hydrocharitaceae), a common species in the waters of the middle and lower reaches of the Yangtze River, responds to these factors, we conducted a mesocosm experiment using simulated CO 2 elevation (by bubbling CO 2 into experimental water) and ambient temperature warming systems. During the 60 d experiment, CO 2 elevation significantly increased the inorganic carbon concentration in the water column. The warming systems elevated average water temperature by approximately 3°C. The elevation of CO 2 levels significantly enhanced the photosynthetic performance, growth and clonal propagation of V. natans. When combined with an increase in CO 2 , elevated temperatures also promoted photosynthesis and growth. The individual ramet biomass of V. natans decreased with increasing temperature, but only significantly under ambient CO 2 levels. CO 2 elevation increased both stolon elongation and bud number. At elevated CO 2 concentration, more biomass was allocated to the stolons, roots and buds, while less biomass was allocated to the leaves. These results indicate that the eco-physiological responses of V. natans should increase its stress tolerance in aquatic plant communities under future spatial and temporal variation in CO 2 levels, however, further research is required.

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Section: Discussionsupporting

confidence: 92%

Section: Discussionmentioning

confidence: 99%

Responses of the submerged macrophyte Vallisneria natans to elevated CO2 and temperature

Cao¹,

Ruan²

2015

Aquat. Biol.

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“…In contrast to previous studies (e.g., Alpert, 1999a;Xiao et al, 2007), our results offer little support for the hypothesis that plants growing in less optimal conditions benefit from being integrated with plants in optimal habitat. The limited integration effect could be because resource sharing depends on which ramet (parent or offspring) is located in a resource rich patch (Wolfer and Straile, 2012), or because of other factors not considered such as age of ramets or clonal growth form (Song et al, 2013Xu et al, 2012.…”

Section: Discussioncontrasting

confidence: 56%

“…This flexibility in growth form provides many benefits to clonal plants, including improved ability to grow and colonize in low resource environments (Stuefer et al, 1994;Alpert, 1996). Under severe growing conditions or high environmental variability, clonal plants may have increased survivorship (Xu et al, 2010) because clones can respond plastically by dividing labor and sharing resources (Alpert, 1996(Alpert, , 1999aXiao et al, 2007). However, the benefits of clonal integration among ramets can vary among wetland plant species (Pennings and Callaway, 2000).…”

Section: Introductionmentioning

confidence: 99%

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Clonal integration in Ludwigia hexapetala under different light regimes

et al. 2015

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a b s t r a c tPhysiological integration among ramets of invasive plant species may support their colonization and spread in novel aquatic environments where growth-limiting resources are spatially heterogeneous. Under contrasting light conditions, we investigated how clonal integration influences growth, biomass allocation and morphology of Ludwigia hexapetala, an emergent floating-leaved macrophyte that is highly invasive in a range of wetland habitat types. In aquatic mesocosms, stolons of offspring ramets were either connected or severed from parent plants, with the pairs exposed to homogenous or heterogeneous combinations of sun or 85% shade. Morphological traits of all ramets were strongly influenced by light environment, and low light availability decreased plant growth, regardless of integration status. Allocation patterns varied with light regime; shaded plants increased allocation to leaf biomass while sun plants allocated more resources to belowground growth. Offspring ramets integrated with parents produced more biomass, suggesting a fitness advantage through integration. However, parent ramet performance declined with stoloniferous integration; integrated parents produced fewer ramets and allocated more resources to belowground biomass. For most response variables measured, there was no significant interactive effect between light treatment and integration, although parents growing in the shade attached to an offspring in the sun increased root mass ratio. The ability to establish and spread into new environments is a key trait of invasive plants, and physiological integration of resources may improve the establishment of juvenile ramets across variable light environments during early colonization. Physiological integration in patchy light environments may contribute to the invasiveness of L. hexapetala.Published by Elsevier B.V.

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Differential effects of water depth and sediment type on clonal growth of the submersed macrophyte Vallisneria natans

Xiao

2007

Hydrobiologia

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The response of clonal growth and ramet morphology to water depth (from 60 to 260 cm) and sediment type (sand versus organic clay) was investigated for the stoloniferous submersed macrophyte Vallisneria natans in an outdoor pond experiment. Results showed that water depth significantly affected clonal growth of V. natans in terms of clone weight, number of ramets, number of generations, clonal radius and stolon length. V. natans showed an optimal clonal growth at water depths of 110-160 cm, but at greater depths clonal growth was severely retarded. A high allometric effect was exhibited in ramet morphology. Along the sequentially produced ramet generations, ramet weight and plant height decreased while stolon length and the root:leaf weight ratio increased. When using ramet generations as covariate, sediment type rather than water depth more strongly affected the ramet characteristics. For plants grown in clay, ramet weight, ramet height and stolon length were greater, and plants exhibited lower root:leaf weight ratio. These data suggest that water depth and sediment type have differential effects on clonal growth of V. natans: Water depth appears primarily to affect numerical increase in ramets and spatial spread, whereas sediment type mainly affects biomass accumulation and biomass allocation.

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Benefits of clonal integration between interconnected ramets of Vallisneria spiralis in heterogeneous light environments

Cited by 32 publications

References 33 publications

Responses of the submerged macrophyte Vallisneria natans to elevated CO2 and temperature

Responses of the submerged macrophyte Vallisneria natans to elevated CO2 and temperature

Clonal integration in Ludwigia hexapetala under different light regimes

Differential effects of water depth and sediment type on clonal growth of the submersed macrophyte Vallisneria natans

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