Interaction between increased CO2 and temperature enhance plant growth but do not affect millet grain production

IF 1.2 4区 农林科学 Q3 AGRONOMY Acta Scientiarum. Agronomy. Pub Date : 2022-03-08 DOI:10.4025/actasciagron.v44i1.53515
Gabriela Viana de Oliveira Lima, Y. Oki, Leandra Bordignon, Wallison K. Siqueira, M. França, D. Boanares, A. Franco, G. Fernandes
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引用次数: 3

Abstract

The intergovernmental panel on climate change predicts a progressive increase in atmospheric CO2 concentration and temperature; however, their effects on cereals have been shown for a limited number of species. This study evaluates the effects of increased CO2 concentration and temperature separately and combined on millet growth and grain production in open-top chambers where the microclimate was adjusted to the following conditions: ambient CO2 and temperature; CO2 enriched (~ 800 ppm) and ambient temperature; ambient CO2 and higher temperature (+3ºC); and CO2-enriched and higher temperature. For each treatment, two chambers were used, each containing 15 7 L pots. Each pot received five seeds at the beginning of the experiment and thinning to one plant per pot at 15 days after sowing. Ten plants were harvested from each chamber 65 days after sowing and the plant height, the number of leaves and the longest root length as well as shoot and root biomass were measured. The remaining plants were harvested 130 days after sowing to evaluate grain production. The results indicate that high CO2 levels did not affect plant growth and biomass. On the other hand, plants subjected to high temperature grew 7% taller than those grown under ambient temperature. Contrastingly, plants submitted to both elevated CO2 and temperature were 19% taller and had 22% more shoot biomass than plants under ambient CO2 and temperature. However, grain production did not change in any of the environmental conditions. We provide evidence that millets are tolerant of the predicted climate changes and that grain production potential may not be affected.
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升高的CO2与温度的交互作用促进了植物的生长,但对谷子的产量没有影响
政府间气候变化专门委员会预测,大气中的二氧化碳浓度和温度将逐步上升;然而,它们对谷物的影响只显示在有限数量的物种上。本研究分别评价了CO2浓度和温度升高对开顶室谷子生长和籽粒产量的影响,该开顶室小气候调节为:环境CO2和温度;CO2富集(~ 800 ppm)和环境温度;环境CO2和更高温度(+3℃);富含二氧化碳,温度更高。每次处理使用两个室,每个室装有15个7 L罐。试验开始时,每罐播种5粒种子,播种后15天,每罐播种1粒。播种65 d后每个室收获10株,测定株高、叶片数、最长根长以及茎和根生物量。剩余植株在播种130天后收获,以评估籽粒产量。结果表明,高CO2浓度对植物生长和生物量没有影响。另一方面,高温处理的植株比常温下生长的植株高7%。相比之下,二氧化碳和温度均升高的植株比二氧化碳和温度均升高的植株高19%,茎部生物量增加22%。然而,粮食产量在任何环境条件下都没有变化。我们提供的证据表明,小米对预测的气候变化具有耐受性,粮食生产潜力可能不会受到影响。
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来源期刊
Acta Scientiarum. Agronomy.
Acta Scientiarum. Agronomy. Agricultural and Biological Sciences-Agronomy and Crop Science
CiteScore
2.40
自引率
0.00%
发文量
45
审稿时长
>12 weeks
期刊介绍: The journal publishes original articles in all areas of Agronomy, including soil sciences, agricultural entomology, soil fertility and manuring, soil physics, physiology of cultivated plants, phytopathology, phyto-health, phytotechny, genesis, morphology and soil classification, management and conservation of soil, integrated management of plant pests, vegetal improvement, agricultural microbiology, agricultural parasitology, production and processing of seeds.
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