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Effect of Partial Root-Zone Drying Irrigation (PRD) on the Gas Exchange and Antioxidant Enzymatic Activities in Alfalfa

  • Jing Zhang
  • Hui Xia Liu
  • Xiao Pan Pang
  • Cheng Yu
  • Qian Wang
  • Yu Pei Zhou
  • Li Guo Lin
  • Zheng Gang GuoEmail author
Research Article
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Abstract

Although partial root-zone drying irrigation (PRD) has been proven to be applicable to alfalfa production, the physiological mechanism of how PRD improves water use efficiency without biomass loss in alfalfa has not been well documented. We designed a field experiment with two irrigation modes (PRD and conventional furrow irrigation (CFI)) and four irrigation volumes (70%-I1, 85%-I2, 100%-I3, and 115%-I4 of alfalfa water requirement (ET)) to determine the effect of PRD on gas exchange and antioxidant enzymatic activities. Our study showed that PRD did not markedly affect the biomass but reduced the leaf area of alfalfa plants at the first and second harvest times. Whether for the first or second harvest time, PRD had no significant effect on net photosynthetic rate (Pn) but decreased the stomatal conductance (Gs) and transpiration rate (Tr), resulting in higher leaf water use efficiency (LWUE). PRD significantly increased the superoxide dismutase (SOD), peroxidase (POD), and catalase (CAT) activities, as well as the soluble sugar, proline, and malondialdehyde (MDA) concentrations, and decreased the soluble protein concentration at the first and the second harvest times. These results suggest that PRD could improve photosynthetic characteristics, increase oxidation resistance, and regulate osmotic adjustment. This would conserve irrigation water volumes and maintain a relatively steady biomass of alfalfa plants. Our findings present physiological evidence that PRD can be successfully applied to alfalfa production.

Keywords

Alfalfa Partial root drying irrigation Gas exchange Antioxidant enzyme Osmotic adjustment substances 

Notes

Funding Information

The research was funded by the Changjiang Scholars and Innovative Research Team in University (IRT17R50), the National Key Research and Development Plan (2016YFC0400302), and the special funds for public welfare industry (agriculture) (201403048-3).

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Copyright information

© Sociedad Chilena de la Ciencia del Suelo 2019

Authors and Affiliations

  • Jing Zhang
    • 1
  • Hui Xia Liu
    • 2
  • Xiao Pan Pang
    • 1
  • Cheng Yu
    • 1
  • Qian Wang
    • 1
  • Yu Pei Zhou
    • 1
  • Li Guo Lin
    • 2
  • Zheng Gang Guo
    • 1
    Email author
  1. 1.Key Laboratory of Grassland Livestock Industry Innovation, Ministry of Agriculture and Rural Affairs, State Key Laboratory of Grassland Agro-Ecosystem, College of Pastoral Agricultural Science and TechnologyLanzhou UniversityLanzhou CityPeople’s Republic of China
  2. 2.College of Life Science and EngineeringNorthwest University for NationalitiesLanzhou CityPeople’s Republic of China

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