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Related Experiment Video

Updated: Dec 24, 2025

Quantification of Endogenous Auxin and Cytokinin During Internode Culture of Ipecac
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Nitrogen Deficiency-Induced Decrease in Cytokinins Content Promotes Rice Seminal Root Growth by Promoting Root

Qi Wang1, Yanchun Zhu1, Xiao Zou1,2

  • 1College of Plant Science and Technology, Huazhong Agricultural University, Wuhan 430070, China.

Cells
|April 15, 2020
PubMed
Summary

Nitrogen deficiency promotes rice seminal root growth by decreasing cytokinin levels. This reduction enhances root meristem cell proliferation and elongation, aiding nutrient foraging in rice (Oryza sativa L.) seedlings.

Keywords:
cell elongationcell proliferationcytokininnitrogen deficiencyriceroot meristemseminal root growth

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Area of Science:

  • Plant Biology
  • Plant Physiology
  • Molecular Biology

Background:

  • Nitrogen deficiency triggers a foraging response in rice (Oryza sativa L.) seedlings, characterized by increased root length.
  • The precise molecular mechanisms governing this developmental plasticity in root growth remain largely unelucidated.

Purpose of the Study:

  • To investigate the mechanism by which nitrogen deficiency influences seminal root growth in rice.
  • To elucidate the role of cytokinins (CKs) in mediating this response.

Main Methods:

  • Comparative analysis of rice seedlings under varying nitrogen (N) concentrations.
  • Quantification of CK content and expression analysis of CK biosynthesis and degradation genes.
  • Examination of root meristem cell proliferation and elongation-related gene expression.

Main Results:

  • Nitrogen deficiency significantly promoted seminal root growth, an effect reversed by zeatin (a CK).
  • A decrease in CK content was observed under N deficiency, linked to altered gene expression for CK biosynthesis and degradation.
  • N deficiency-induced reduction in CKs enhanced root meristem cell proliferation and elongation through modulation of specific genes (e.g., OsIAA3, OsPLTs, OsXTHs, OsEXPs).

Conclusions:

  • Nitrogen deficiency-induced decrease in cytokinin content is a key regulator of seminal root growth in rice.
  • This hormonal shift promotes root development by enhancing both cell proliferation and cell elongation.
  • Understanding this mechanism offers insights into improving rice cultivation under nutrient-limited conditions.