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首页> 外文期刊>Plant and Soil >Water use dynamics of dryland canola (Brassica napus L.) grown on contrasting soils under elevated CO2
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Water use dynamics of dryland canola (Brassica napus L.) grown on contrasting soils under elevated CO2

机译：旱地水桶（芸苔NAPUS L.）的用水动力学在升高的CO2下的造影土壤上生长

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Background and aimsIncreasing atmospheric carbon dioxide concentration ([CO2]) stimulates the leaf-level (intrinsic) water use efficiency (iWUE), which may mitigate the adverse effects of drought by lowering water use in plants. This study investigated the interactive effect of [CO2] and soil type on growth, yield and water use of canola (Brassica napus L.) in a dryland environment.MethodsTwo canola cultivars (vigorous hybrid cv. Hyola 50' and non-hybrid cv. Thumper') were grown in large intact soil cores containing either a sandy Calcarosol or clay Vertosol under current ambient (a[CO2]) and future elevated [CO2] (e[CO2]), approximate to 550molmol(-1)). Net assimilation rates (A(net)), stomatal conductance (g(s)) and leaf area were measured throughout the growing season. Seed yield and yield components were recorded at final harvest. Water use was monitored by lysimeter balances.ResultsElevated [CO2]-stimulation of iWUE was greater than the effect on leaf area, therefore, water use was lower under e[CO2] than a[CO2], but this was further modified by soil type and cultivar. The dynamics of water use throughout the growing season were different between the studied cultivars and in line with their leaf development. The effect of e[CO2] on seed yield was dependent on cultivar; the non-hybrid cultivar benefitted more from increased [CO2]. Although textural differences between soil types influenced the water use under e[CO2], this did not affect the CO2 fertilisation effect' on the studied canola cultivars.ConclusionElevated [CO2]-induced water savings observed in the present study is a potential mechanism of ameliorating drought effects in high CO2 environment. Better understanding of genotypic variability in response to water use dynamics with traits affecting assimilate supply and use can help breeders to improve crop germplasm for future climates.
机译：背景和旨在促进大气二氧化碳浓度（[CO2]）刺激叶子水平（内在）用水效率（IWUE），这可能通过降低植物的用水来减轻干旱的不利影响。本研究研究了[CO2]和土壤类型对Dryland环境中CANOLA（芸苔NAPUS L.）的生长，产量和用水的互动效果。方法（剧烈的杂交CV。Hyola 50'和非杂交CV。在当前环境（A [CO2]）和未来升高的[CO2]（E [CO2]）下，在含有含有含沙草醇或粘土前胚醇的大型完整的土壤芯中生长在大型完整的土壤芯中。在整个生长季节中测量净同化率（（净）），气孔导率（G（S））和叶面积。在最终收获时记录种子产量和产量组分。通过Lysimeter余额监测用水。普利的方法[CO2] -Supulation大于叶面积的效果，因此，在E [CO2]下的用水低于[CO2]，但是通过土壤类型进一步改性这一点和品种。在研究的品种和叶片发育中，整个生长季节的水使用的动态不同。 E [CO2]对种子产量的影响依赖于品种;非杂交品种受益于增加[二氧化碳]。虽然土壤类型之间的纹理差异影响了e [CO2]的用水，但这并不影响研究的CANOLA品种的二氧化碳施肥效应。在本研究中观察到的潜在水分的组合[CO2]诱导的水分是改善的潜在机制高二氧化碳环境中的干旱效应。更好地了解基因型变异以响应水使用动态，具有影响同化供应的性状和使用的性状可以帮助育种者改善未来气候的作物种质。

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