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Bi-phasic growth patterns in rice.

John E Sheehy1, P L Mitchell, Anaida B Ferrer

  • 1International Rice Research Institute, DAPO 7777, Metro Manila, Philippines. j.sheehy@cgiar.org

Annals of Botany
|October 7, 2004
PubMed
Summary
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Rice crop growth isn't a single curve but two distinct phases: vegetative and reproductive. This bi-phasic model explains dry matter accumulation and yield formation in rice plants.

Area of Science:

  • Agricultural Science
  • Plant Physiology
  • Crop Science

Background:

  • Rice crop growth patterns, specifically above-ground dry matter accumulation, deviate from the expected sigmoid curve for monocarpic plants.
  • Observed growth shows a dip around flowering, followed by a resurgence and final decline, indicating a complex, non-linear progression.

Purpose of the Study:

  • To analyze the bi-phasic growth pattern in rice crops over a five-year period.
  • To model the time course of above-ground dry matter accumulation using logistic curves for distinct growth phases.

Main Methods:

  • Logistic curves were applied independently to the vegetative and reproductive (panicle) components of the rice crop.
  • The summed logistic curves effectively described the overall time course of dry matter accumulation, including the growth pause and resumption.

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Main Results:

  • The vegetative growth phase appeared largely independent of annual weather variations.
  • The panicle growth phase exhibited significant year-to-year variability, strongly correlated with weather patterns.

Conclusions:

  • Modeling rice growth as two distinct logistic phases provides a clearer understanding of plant development and yield formation.
  • This bi-phasic approach offers valuable insights into the underlying mechanisms of rice crop productivity.