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Related Experiment Videos

Leaf area partitioning as an important factor in growth.

J R Potter1

  • 1Southern Weed Science Laboratory, Agricultural Research Service, United States Department of Agriculture, Stoneville, Mississippi 38776.

Plant Physiology
|January 1, 1977
PubMed
Summary

Plant growth is better predicted by how efficiently plants create new leaf area (leaf area partitioning) than by photosynthesis rates alone. This finding is crucial for understanding crop yield potential.

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Area of Science:

  • Plant Physiology
  • Crop Science
  • Photosynthesis Research

Background:

  • Correlating crop photosynthesis rates with growth has been challenging.
  • Photosynthate partitioning into new leaf area is a key factor in plant growth.

Purpose of the Study:

  • To develop and test a method for measuring leaf area partitioning.
  • To compare relative growth rates with net assimilation and partitioning metrics across species and temperatures.

Main Methods:

  • Growth analysis techniques were used to compare relative growth rates.
  • Leaf area partitioning and leaf weight partitioning were measured.
  • Nine species were grown under three different temperature regimes in growth chambers.

Main Results:

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  • Relative growth rates correlated strongly with leaf area partitioning in most species.
  • Relative growth rates were inversely correlated with leaf weight partitioning in many species.
  • Net assimilation rates showed poor correlation with relative growth rates for several species.

Conclusions:

  • Temperature-induced growth changes are more influenced by leaf area partitioning and relative leaf area expansion rates than net assimilation rates.
  • Effective correlation of photosynthesis rates with crop growth requires incorporating leaf area partitioning or relative leaf area expansion rates.