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Sucrose synthase activity in developing wheat endosperms differing in maximum weight.

E M Dale1, T L Housley

  • 1Department of Agronomy, Purdue University, West Lafayette, Indiana 47907.

Plant Physiology
|September 1, 1986
PubMed
Summary
This summary is machine-generated.

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Wheat kernel growth is linked to sucrose synthase activity. Larger, faster-growing kernels exhibit higher sucrose synthase activity, crucial for starch synthesis in the endosperm.

Area of Science:

  • Plant Physiology
  • Biochemistry
  • Agricultural Science

Background:

  • Wheat kernel development relies on sucrose influx for starch synthesis.
  • Sucrose synthase (EC 2.4.13) catalyzes the initial step in sucrose to starch conversion.

Purpose of the Study:

  • To investigate the role of sucrose synthase activity in wheat (Triticum aestivum) kernels with varying growth rates and final dry weights.
  • To correlate sucrose synthase levels with kernel growth dynamics and starch accumulation.

Main Methods:

  • Assaying sucrose synthase activity in developing wheat endosperms.
  • Comparing enzyme activity across kernels with different growth rates and maximum dry weights.
  • Measuring kernel water content to understand activity expression.

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Main Results:

  • Sucrose synthase activity per endosperm remained constant over time (10-22 days post-anthesis).
  • Kernels with higher growth rates and maximum dry weight showed significantly higher sucrose synthase activity.
  • Larger kernels possessed greater water content, potentially facilitating enzyme activity.

Conclusions:

  • Sucrose synthase activity is positively associated with wheat kernel size and growth rate.
  • While not the rate-limiting enzyme, sucrose synthase plays a significant role in supporting the development of larger, faster-growing wheat kernels.