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Related Experiment Videos

Expansins and Internodal Growth of Deepwater Rice.

H. T. Cho1, H. Kende

  • 1Michigan State University-Department of Energy Plant Research Laboratory, Michigan State University, East Lansing, Michigan 48824-1312.

Plant Physiology
|April 1, 1997
PubMed
Summary

Expansin, a cell wall-loosening protein, drives internodal growth in deepwater rice. Its activity and distribution increase significantly in submerged rice, promoting rapid elongation.

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Area of Science:

  • Plant Biology
  • Molecular Biology
  • Biochemistry

Background:

  • Deepwater rice (Oryza sativa L.) exhibits rapid internodal elongation, particularly under submergence.
  • Expansins are key proteins involved in cell wall loosening and plant growth.

Purpose of the Study:

  • To investigate the role and localization of expansin in deepwater rice internodal growth.
  • To determine how submergence affects expansin activity and distribution.

Main Methods:

  • Acid-induced cell wall extension assays.
  • Immunolocalization using antibodies against cucumber expansin.
  • Tissue printing and immunoblot analysis.

Main Results:

  • Rice expansin was primarily localized in the intercalary meristem (IM) and elongation zone.
  • Expansin distribution was concentrated around vascular bundles and the inner epidermal layer.
  • Submerged rice internodes showed increased cell wall extensibility and higher expansin content.
  • Cell walls of submerged internodes were more susceptible to added expansin.

Conclusions:

  • Expansin is crucial for mediating rapid internodal elongation in deepwater rice.
  • Submergence enhances internodal growth by increasing expansin levels and activity.
  • Expansin plays a significant role in the adaptive growth of rice under flooded conditions.

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