Bioenergy sorghum maintains photosynthetic capacity in elevated ozone concentrations
| Autor: | DoKyoung Lee, Shuai Li, Christopher A Moller, Elizabeth A. Ainsworth, Noah G. Mitchell |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
Chlorophyll
0106 biological sciences 0301 basic medicine Stomatal conductance Specific leaf area Physiology Plant Science Photosynthesis 01 natural sciences 03 medical and health sciences Ozone Nutrient Bioenergy Chlorophyll fluorescence Sorghum photosynthesis biomass chlorophyll fluorescence biology BWB model food and beverages Plant Transpiration Original Articles biology.organism_classification Photosynthetic capacity Plant Leaves 030104 developmental biology Agronomy stomatal conductance Original Article MED model 010606 plant biology & botany |
| Zdroj: | Plant, Cell & Environment |
| ISSN: | 1365-3040 0140-7791 |
| Popis: | Elevated tropospheric ozone concentration (O3) significantly reduces photosynthesis and productivity in several C4 crops including maize, switchgrass and sugarcane. However, it is unknown how O3 affects plant growth, development and productivity in sorghum (Sorghum bicolor L.), an emerging C4 bioenergy crop. Here, we investigated the effects of elevated O3 on photosynthesis, biomass and nutrient composition of a number of sorghum genotypes over two seasons in the field using free‐air concentration enrichment (FACE), and in growth chambers. We also tested if elevated O3 altered the relationship between stomatal conductance and environmental conditions using two common stomatal conductance models. Sorghum genotypes showed significant variability in plant functional traits, including photosynthetic capacity, leaf N content and specific leaf area, but responded similarly to O3. At the FACE experiment, elevated O3 did not alter net CO2 assimilation (A), stomatal conductance (g s), stomatal sensitivity to the environment, chlorophyll fluorescence and plant biomass, but led to reductions in the maximum carboxylation capacity of phosphoenolpyruvate and increased stomatal limitation to A in both years. These findings suggest that bioenergy sorghum is tolerant to O3 and could be used to enhance biomass productivity in O3 polluted regions. Sorghum (Sorghum bicolor L.), a widely adapted and highly productive C4 grass, has potential as a bioenergy feedstock. In this study, we found that sorghum genotypes exhibit significant variability in plant functional traits, but a similar response to O3. Elevated O3 did not alter net CO2 assimilation (A), stomatal conductance (g s) and chlorophyll fluorescence in multiple genotypes of sorghum in both field and chamber experiments. We suggest that sorghum could be used to enhance biomass production for bioenergy in O3 polluted regions. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Plný text