| Autor: |
BISHOP, KRISTEN A., BETZELBERGER, AMY M., LONG, STEPHEN P., AINSWORTH, ELIZABETH A. |
| Předmět: |
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| Zdroj: |
Plant, Cell & Environment; Sep2015, Vol. 38 Issue 9, p1765-1774, 10p, 1 Diagram, 4 Charts, 4 Graphs |
| Abstrakt: |
Rising atmospheric [ CO2] is a uniform, global change that increases C3 photosynthesis and could offset some of the negative effects of global climate change on crop yields. Genetic variation in yield responsiveness to rising [ CO2] would provide an opportunity to breed more responsive crop genotypes. A multi-year study of 18 soybean ( G lycine max Merr.) genotypes was carried out to identify variation in responsiveness to season-long elevated [ CO2] (550 ppm) under fully open-air replicated field conditions. On average across 18 genotypes, elevated [ CO2] stimulated total above-ground biomass by 22%, but seed yield by only 9%, in part because most genotypes showed a reduction in partitioning of energy to seeds. Over four years of study, there was consistency from year to year in the genotypes that were most and least responsive to elevated [ CO2], suggesting heritability of CO2 response. Further analysis of six genotypes did not reveal a photosynthetic basis for the variation in yield response. Although partitioning to seed was decreased, cultivars with the highest partitioning coefficient in current [ CO2] also had the highest partitioning coefficient in elevated [ CO2]. The results show the existence of genetic variation in soybean response to elevated [ CO2], which is needed to breed soybean to the future atmospheric environment. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
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