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The relationship between transpiration and nutrient uptake in wheat changes under elevated atmospheric CO2
Alireza Houshmandfar1,2, Glenn J Fitzgerald2,3, Garry O'Leary3
1CSIRO Agriculture and Food, Private Bag 5, P.O., Wembley, WA, 6913, Australia.
Physiologia Plantarum
|December 6, 2017
Summary
Elevated carbon dioxide (eCO2) decreases wheat nutrient concentrations. While reduced water transpiration plays a role, nutrient uptake per unit of water is higher under eCO2, indicating other factors are involved.
Area of Science:
- Agricultural Science
- Plant Physiology
- Environmental Science
Background:
- Elevated atmospheric carbon dioxide (eCO2) can affect crop nutrient content.
- Reduced transpiration-driven mass flow of nutrients has been proposed as a key factor in nutrient dilution under eCO2.
Purpose of the Study:
- To investigate the relationship between transpiration, nutrient uptake, and nutrient concentrations in wheat under eCO2.
- To determine the contribution of transpiration-driven mass flow to nutrient decline in wheat under eCO2.
Main Methods:
- Utilized a free-air CO2 enrichment (FACE) experiment in Australia.
- Employed the agricultural production systems simulator (APSSIM) for simulation studies.
Main Results:
- Wheat transpiration and nutrient uptake (N, K, S, Ca, Mg, Mn) were correlated under eCO2.
- Nutrient uptake per unit of water transpired was higher under eCO2 compared to ambient CO2 (aCO2).
Conclusions:
- Transpiration-driven mass flow contributes to decreased nutrient concentrations in wheat under eCO2.
- This mechanism alone does not fully explain the observed overall decline in nutrient concentrations.
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Overview
Transcription is the process of synthesizing RNA from a DNA sequence by RNA polymerase. It is the first step in producing a protein from a gene sequence. Additionally, many other proteins and regulatory sequences are involved in the proper synthesis of messenger RNA (mRNA). Regulation of transcription is responsible for the differentiation of all the different types of cells and often for the proper cellular response to environmental signals.
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