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Nitrogen increases drought tolerance in maize seedlings.

Yushuang Song1, Jinlu Li1, Mingli Liu1

  • 1Shandong Provincial Key Laboratory of Plant Stress, College of Life Science, Shandong Normal University, Jinan, 250014, China.

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|March 17, 2020
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Summary
This summary is machine-generated.

Moderate nitrogen supply enhances maize drought resistance by improving photosynthetic capacity and antioxidant activity. Both low and high nitrogen levels increase drought sensitivity in maize plants.

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Area of Science:

  • Plant physiology
  • Environmental stress biology
  • Agricultural science

Background:

  • Drought and nitrogen availability critically influence plant growth and global distribution.
  • Understanding plant responses to these factors is vital for agriculture and ecology.

Purpose of the Study:

  • To investigate the impact of varying nitrogen concentrations on maize seedlings under drought stress.
  • To assess the effects on photosynthesis, oxidative stress, and nitrogen metabolism.

Main Methods:

  • Maize seedlings were subjected to three nitrogen levels (0.5, 7.5, 15mM) and three water availability conditions (normal, mild drought, severe drought).
  • Measurements included biomass, chlorophyll content, gas exchange parameters, oxidative stress markers, and nitrogen metabolism indicators.

Main Results:

  • Drought reduced biomass, chlorophyll, photosynthetic rates, and PSII efficiency (ΦPSII).
  • Moderate nitrogen supply mitigated drought effects, enhancing photosynthetic capacity and NO3- content.
  • Oxidative stress markers increased under drought, with altered antioxidant enzyme activities. Abscisic acid increased with nitrogen under drought.

Conclusions:

  • Moderate nitrogen supply enhances maize resistance to drought stress.
  • Both deficient and excessive nitrogen increase maize sensitivity to drought.
  • Findings guide optimal nitrogen fertilizer application for drought-prone areas.