Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1111/gcb.13526 |
Decreasing, not increasing, leaf area will raise crop yields under global atmospheric change | |
Srinivasan, Venkatraman1; Kumar, Praveen2,3; Long, Stephen P.1,4,5,6 | |
2017-04-01 | |
发表期刊 | GLOBAL CHANGE BIOLOGY |
ISSN | 1354-1013 |
EISSN | 1365-2486 |
出版年 | 2017 |
卷号 | 23期号:4 |
文章类型 | Article |
语种 | 英语 |
国家 | USA; England |
英文摘要 | Without new innovations, present rates of increase in yields of food crops globally are inadequate to meet the projected rising food demand for 2050 and beyond. A prevailing response of crops to rising [CO2] is an increase in leaf area. This is especially marked in soybean, the world's fourth largest food crop in terms of seed production, and the most important vegetable protein source. Is this increase in leaf area beneficial, with respect to increasing yield, or is it detrimental? It is shown from theory and experiment using open-air whole-season elevation of atmospheric [CO2] that it is detrimental not only under future conditions of elevated [CO2] but also under today's [CO2]. A mechanistic biophysical and biochemical model of canopy carbon exchange and microclimate (MLCan) was parameterized for a modern US Midwest soybean cultivar. Model simulations showed that soybean crops grown under current and elevated (550 [ppm]) [CO2] overinvest in leaves, and this is predicted to decrease productivity and seed yield 8% and 10%, respectively. This prediction was tested in replicated field trials in which a proportion of emerging leaves was removed prior to expansion, so lowering investment in leaves. The experiment was conducted under open-air conditions for current and future elevated [CO2] within the Soybean Free Air Concentration Enrichment facility (SoyFACE) in central Illinois. This treatment resulted in a statistically significant 8% yield increase. This is the first direct proof that a modern crop cultivar produces more leaf than is optimal for yield under today's and future [CO2] and that reducing leaf area would give higher yields. Breeding or bioengineering for lower leaf area could, therefore, contribute very significantly to meeting future demand for staple food crops given that an 8% yield increase across the USA alone would amount to 6.5 million metric tons annually. |
英文关键词 | climate change crop bioengineering ecohydrology food security plant breeding rising CO2 |
领域 | 气候变化 ; 资源环境 |
收录类别 | SCI-E |
WOS记录号 | WOS:000396836800022 |
WOS关键词 | CARBON-DIOXIDE CONCENTRATION ; AIR CO2 ENRICHMENT ; SOYBEAN SEED YIELD ; ELEVATED CO2 ; RISING CO2 ; PHOTOSYNTHESIS ; FOOD ; FIELD ; FUTURE ; GROWTH |
WOS类目 | Biodiversity Conservation ; Ecology ; Environmental Sciences |
WOS研究方向 | Biodiversity & Conservation ; Environmental Sciences & Ecology |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/17025 |
专题 | 气候变化 资源环境科学 |
作者单位 | 1.Univ Illinois, Carl R Woese Inst Genom Biol, Urbana, IL 61801 USA; 2.Univ Illinois, Dept Civil & Environm Engn, Urbana, IL 61801 USA; 3.Univ Illinois, Dept Atmospher Sci, Urbana, IL 61801 USA; 4.Univ Illinois, Dept Crop Sci, Urbana, IL 61801 USA; 5.Univ Illinois, Dept Plant Biol, Urbana, IL 61801 USA; 6.Univ Lancaster, Lancaster Environm Ctr, Lancaster LA1 4YQ, England |
推荐引用方式 GB/T 7714 | Srinivasan, Venkatraman,Kumar, Praveen,Long, Stephen P.. Decreasing, not increasing, leaf area will raise crop yields under global atmospheric change[J]. GLOBAL CHANGE BIOLOGY,2017,23(4). |
APA | Srinivasan, Venkatraman,Kumar, Praveen,&Long, Stephen P..(2017).Decreasing, not increasing, leaf area will raise crop yields under global atmospheric change.GLOBAL CHANGE BIOLOGY,23(4). |
MLA | Srinivasan, Venkatraman,et al."Decreasing, not increasing, leaf area will raise crop yields under global atmospheric change".GLOBAL CHANGE BIOLOGY 23.4(2017). |
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