Effects of clonal integration and light availability on the growth and physiology of two invasive herbs
Article
Article Title | Effects of clonal integration and light availability on the growth and physiology of two invasive herbs |
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ERA Journal ID | 3272 |
Article Category | Article |
Authors | Xu, Cheng-Yuan (Author), Schooler, Shon S. (Author) and van Klinken, Rieks D. (Author) |
Journal Title | Journal of Ecology |
Journal Citation | 98 (4), pp. 833-844 |
Number of Pages | 12 |
Year | 2010 |
Publisher | John Wiley & Sons |
Place of Publication | Oxford, United Kingdom |
ISSN | 0022-0477 |
1365-2745 | |
Digital Object Identifier (DOI) | https://doi.org/10.1111/j.1365-2745.2010.01668.x |
Abstract | Clonal plants benefit from the ability to translocate resources among interconnected ramets to colonize heterogeneous habitats. Clonal integration affects the resource level and morphological traits of ramets, and thus may influence their physiology and general performance. Although leaf gas exchange and its associated physiological adjustments are key traits to assess plant fitness, the 2. In a glasshouse experiment, we addressed how clonal integration affects gas exchange properties, leaf characters and growth of ramets in two invasive plants, Alternanthera philoxeroides and Phyla canescens, under full sun and 85%shade. We also used stable-isotope labelling to assess the maternal subsidy to daughter ramets. 3. Similar effects of connection were observed in both species for most gas exchange parameters and leaf characters. Clonal integration did not affect photosynthetic capacity and respiratory rates of ramets.When grown in shade, ramets connected with an unshaded mother plant displayed higher area-based leaf nitrogen and chlorophyll content than severed ramets, but the additional nitrogen and chlorophyll was not translated to increased photosynthetic capability. Overall, severed ramets displayed significant light response for leaf nitrogen (area-based), photosynthetic nitrogen use efficiency, chlorophyll to nitrogen ratio, and nitrogen stable-isotope signature, but the light response was eliminated by clonal integration in connected ramets. 4. Both species displayed substantial maternal carbohydrate subsidy that benefited the growth of daughter ramets, but species-specific patterns were observed in the growth of daughter ramets and the amount of subsidy. The amount of subsidy was independent of ramet growth light levels for 5. Synthesis. We observed increased leaf nitrogen and chlorophyll in shaded, connected ramets of two clonal invasive plants. Clonal integration may facilitate nitrogen assimilation and allow preacclimation to high-light conditions for shaded, connected ramets, thus promoting the opportunistic expansion of these invaders on site scale. The species-specific maternal subsidy pattern demonstrated |
Keywords | alternanthera philoxeroides; biological invasion; chlorophyll; nitrogen; photosynthesis; photosynthetic acclimation; phyla canescens; physiological integration; respiration; translocation |
ANZSRC Field of Research 2020 | 300199. Agricultural biotechnology not elsewhere classified |
300409. Crop and pasture protection (incl. pests, diseases and weeds) | |
310303. Ecological physiology | |
Public Notes | Files associated with this item cannot be displayed due to copyright restrictions. |
Byline Affiliations | Commonwealth Scientific and Industrial Research Organisation (CSIRO), Australia |
https://research.usq.edu.au/item/9zw39/effects-of-clonal-integration-and-light-availability-on-the-growth-and-physiology-of-two-invasive-herbs
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