Dynamic analysis of the impact of free-air CO2 enrichment (FACE) on biomass and N uptake in two contrasting genotypes of rice.
Dynamic analysis of the impact of free-air CO2 enrichment (FACE) on biomass and N uptake in two contrasting genotypes of rice.
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DOI：
10.1071/fp17278
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发表时间：
2018-06
期刊：
影响因子：
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通讯作者：
Jingjing Wu;H. Kronzucker;W. Shi
中科院分区：
文献类型：
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作者：
Jingjing Wu;H. Kronzucker;W. Shi
大气中CO2浓度的升高（[CO2]）通常会增加光合速率和作物产量。然而，CO2增强的程度因品种和生长阶段而异。以武运粳23（WYJ）和II优084（IIY）两个水稻品种为材料，研究了两种CO2（~400 vs ~600）和两种氮素（N）供应条件下水稻5个生育期的响应。在一般情况下，种子产量和地上生物量更响应高[CO2]在IIY比WYJ。但不同氮素水平和生育期的响应差异显著。在低氮输入，产量响应升高[CO2]是可以忽略不计的两个品种，而在正常的输入，产量在IIY是18.8%，高[CO2]下比环境[CO2]。此外，反应升高[CO2]显着不同的生长阶段。升高[CO2]倾向于增加地上植物生物量在两个品种在穗分化（PI）和抽穗期，但这种影响是显着的，只有在IIY的成熟中期和粮食成熟期。相反，CO2的根生物量的增加只发生在IIY。升高[CO2]增加总氮吸收和种子N在IIY，但只增加种子N在WYJ，这表明它增强了氮转运到种子在这两个品种，但促进植物N的收购只在IIY。根系碳积累和氮吸收在IIY比WYJ表现出更强的响应，特别是在抽穗期，这可能在种子灌浆和种子产量中起着关键作用。我们的研究结果表明，更有效地利用CO2在IIY比WYJ的结果在根系生长，氮素吸收，并在产量的强烈反应。这些研究结果表明，[CO2]响应水稻品种的选择可能有助于优化未来[CO2]情景下的水稻产量。
Elevated CO2 concentrations ([CO2]) in the atmosphere often increase photosynthetic rates and crop yields. However, the degree of the CO2 enhancement varies substantially among cultivars and with growth stage. Here, we examined the responses of two rice cultivars, Wuyunjing23 (WYJ) and IIyou084 (IIY), to two [CO2] (~400 vs ~600) and two nitrogen (N) provision conditions at five growth stages. In general, both seed yield and aboveground biomass were more responsive to elevated [CO2] in IIY than WYJ. However, the responses significantly changed at different N levels and growth stages. At the low N input, yield response to elevated [CO2] was negligible in both cultivars while, at the normal input, yield in IIY was 18.8% higher under elevated [CO2] than ambient [CO2]. Also, responses to elevated [CO2] significantly differed among various growth stages. Elevated [CO2] tended to increase aboveground plant biomass in both cultivars at the panicle initiation (PI) and the heading stages, but this effect was significant only in IIY by the mid-ripening and the grain maturity stages. In contrast, CO2 enhancement of root biomass only occurred in IIY. Elevated [CO2] increased both total N uptake and seed N in IIY but only increased seed N in WYJ, indicating that it enhanced N translocation to seeds in both cultivars but promoted plant N acquisition only in IIY. Root C accumulation and N uptake also exhibited stronger responses in IIY than in WYJ, particularly at the heading stage, which may play a pivotal role in seed filling and seed yield. Our results showed that the more effective use of CO2 in IIY compared with WYJ results in a strong response in root growth, nitrogen uptake, and in yield. These findings suggest that selection of [CO2]-responsive rice cultivars may help optimise the rice yield under future [CO2] scenarios.