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Transpiration modulates phosphorus acquisition in tropical tree seedlings
Lucas A Cernusak1, Klaus Winter, Benjamin L Turner
1Research School of Biology, The Australian National University, Canberra, Australian Capital Territory 0200, Australia. lucas.cernusak@anu.edu.au
Tree Physiology
|August 23, 2011
Summary
Tropical seedlings show a positive link between water use efficiency and phosphorus content. Higher transpiration may increase phosphorus uptake, potentially impacting plant nutrient levels in changing climates.
Area of Science:
- Plant Physiology
- Ecology
- Biogeochemistry
Background:
- Transpiration is a key process in plant water use.
- Phosphorus is an essential nutrient for plant growth.
- Understanding nutrient uptake mechanisms is crucial for predicting plant responses to environmental change.
Purpose of the Study:
- To investigate the relationship between transpiration ratio and leaf phosphorus to carbon ratio (P:C) in tropical tree and liana seedlings.
- To explore how transpiration influences phosphorus uptake.
- To predict potential impacts of rising atmospheric CO(2) on plant nutrient dynamics.
Main Methods:
- Measurements of transpiration ratio (kg H(2)O transpired per g C incorporated) and leaf P:C (mg P per g C) in tropical seedlings.
- Statistical correlation analysis across multiple species and under varying experimental conditions.
- Comparison of leaf P:C and whole-plant P:C correlations with transpiration ratio.
Main Results:
- A significant positive correlation was found between transpiration ratio and leaf P:C across 19 species.
- Intra-specific positive correlations between leaf P:C and transpiration ratio were observed in four out of five species tested.
- Whole-plant P:C showed similar positive correlations with transpiration ratio as leaf P:C.
Conclusions:
- Transpiration likely enhances phosphorus uptake in tropical seedlings via mass flow of soil solution to roots.
- Leaf P:C may decrease in tropical forests with rising atmospheric CO(2) due to reduced transpiration ratios.
- This finding has implications for nutrient cycling and forest productivity under future climate scenarios.
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02:04Regulation of Transpiration by Stomata
During photosynthesis, plants acquire the necessary carbon dioxide and release the produced oxygen back into the atmosphere. Openings in the epidermis of plant leaves is the site of this exchange of gasses. A single opening is called a stoma—derived from the Greek word for “mouth.” Stomata open and close in response to a variety of environmental cues.
01:57Adaptations that Reduce Water Loss
Though evaporation from plant leaves drives transpiration, it also results in loss of water. Because water is critical for photosynthetic reactions and other cellular processes, evolutionary pressures on plants in different environments have driven the acquisition of adaptations that reduce water loss.
02:41Responses to Drought and Flooding
Water plays a significant role in the life cycle of plants. However, insufficient or excess of water can be detrimental and pose a serious threat to plants.
02:34Water and Mineral Acquisition
Specialized tissues in plant roots have evolved to capture water, minerals, and some ions from the soil. Roots exhibit a variety of branching patterns that facilitate this process. The outermost root cells have specialized structures called root hairs that increase the root surface, thus increasing soil contact. Water can passively cross into roots, as the concentration of water in the soil is higher than that of the root tissue. Minerals, in contrast, are actively transported into root cells.
02:03Xylem and Transpiration-driven Transport of Resources
The xylem of vascular plants distributes water and dissolved minerals that are taken up by the roots to the rest of the plant. The cells that transport xylem sap are dead upon maturity, and the movement of xylem sap is a passive process.
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