Elevated CO2 alters distribution of nodal leaf area and enhances nitrogen uptake contributing to yield increase of soybean cultivars grown in Mollisols
journal contributionposted on 2021-01-06, 05:11 authored by Jian JinJian Jin, Yansheng Li, Xiaobing Liu, Guanghua Wang, Caixian TangCaixian Tang, Zhenhua Yu, Xiaojuan WangXiaojuan Wang, Stephen J Herbert
© 2017 Jin et al. This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
Understanding how elevated CO2 affects dynamics of nodal leaf growth and N assimilation is crucial for the construction of high-yielding canopy via breeding and N management to cope with the future climate change. Two soybean cultivars were grown in two Mollisols differing in soil organic carbon (SOC), and exposed to ambient CO2 (380 ppm) or elevated CO2 (580 ppm) throughout the growth stages. Elevated CO2 induced 4-5 more nodes, and nearly doubled the number of branches. Leaf area duration at the upper nodes from R5 to R6 was 4.3-fold greater and that on branches 2.4-fold higher under elevated CO2 than ambient CO2, irrespective of cultivar and soil type. As a result, elevated CO2 markedly increased the number of pods and seeds at these corresponding positions. The yield response to elevated CO2 varied between the cultivars but not soils. The cultivar-specific response was likely attributed to N content per unit leaf area, the capacity of C sink in seeds and N assimilation. Elevated CO2 did not change protein concentration in seeds of either cultivar. These results indicate that elevated CO2 increases leaf area towards the upper nodes and branches which in turn contributes yield increase.
PublisherPublic Library of Science
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Science & TechnologyMultidisciplinary SciencesScience & Technology - Other TopicsORYZA-SATIVA L.CARBON-DIOXIDESEED YIELDFUTURE CO2ENRICHMENTRESPONSESPHOTOSYNTHESISPLANTSMETAANALYSISIMPROVEMENTSoybeansSeedsPlant LeavesCarbon DioxideCarbonNitrogenChlorophyllSoilBiomassTemperatureSpecies SpecificityChinaGeneral Science & Technology