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Association of carbon isotope discrimination with leaf gas exchange and water use efficiency in maize following soil amendment with superabsorbent hydrogel

Author

Listed:
  • Wei YANG

    (College of Resources and Environmental Sciences, China Agricultural University, Beijing, P.R. China)

  • Pin-Fang LI

    (College of Resources and Environmental Sciences, China Agricultural University, Beijing, P.R. China
    Key Laboratory of Plant and Soil Interactions, Ministry of Education, Beijing, P.R. China)

Abstract

The correlation of carbon isotope discrimination (△13C) with photosynthetic gas exchange and water use efficiency (WUE) in maize was investigated under low rainfall conditions with or without superabsorbent polymer (SAP). SAP (45 kg/ha) was mixed into the top 10 cm soil layer at sowing in lysimeters. Compared with the control plants not treated with SAP, the application of SAP increased net photosynthesis rate; stomatal conductance (gs); transpiration rate; chlorophyll content (Chl) and intrinsic water use efficiency at leaf level (WUEi), but decreased intercellular CO2 concentration (Ci) and leaf △13C. In plants supplied with SAP, leaf △13C was positively correlated with Ci (r = 0.864, P < 0.01) and negatively correlated with gs and WUEi (r = -0.860 and -0.626, P < 0.01, respectively). Leaf △13C was not correlated with Chl with or without SAP. Grain △13C significantly decreased by 12.4% and showed a significant negative correlation with grain WUE under SAP treatments (r = -0.670, P < 0.05). These results suggest that in the presence of SAP, maize leaf and grain △13C could be good indicators for evaluating maize WUE during periods of low rainfall.

Suggested Citation

  • Wei YANG & Pin-Fang LI, 2018. "Association of carbon isotope discrimination with leaf gas exchange and water use efficiency in maize following soil amendment with superabsorbent hydrogel," Plant, Soil and Environment, Czech Academy of Agricultural Sciences, vol. 64(10), pages 484-490.
    • Handle: RePEc:caa:jnlpse:v:64:y:2018:i:10:id:463-2018-pse
    DOI: 10.17221/463/2018-PSE
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    References listed on IDEAS

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    1. Satriani, A. & Catalano, M. & Scalcione, E., 2018. "The role of superabsorbent hydrogel in bean crop cultivation under deficit irrigation conditions: A case-study in Southern Italy," Agricultural Water Management, Elsevier, vol. 195(C), pages 114-119.
    2. I. Raimanová & P. Svoboda & G. Kurešová & J. Haberle, 2016. "The effect of different post-anthesis water supply on the carbon isotope discrimination of winter wheat grain," Plant, Soil and Environment, Czech Academy of Agricultural Sciences, vol. 62(7), pages 329-334.
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