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Enhanced Sucrose Loading Improves Rice Yield by Increasing Grain Size.

Liang Wang1, Qingtao Lu1, Xiaogang Wen1

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Transgenic rice plants engineered to enhance sucrose loading into phloem tissues showed a significant 16% increase in grain yield. This improvement in crop yield resulted from larger, heavier grains and enhanced photoassimilate transport.

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Area of Science:

  • Plant Biology
  • Agricultural Science
  • Biotechnology

Background:

  • Cereal yield is determined by grain number and size.
  • Sucrose (Suc) is the primary photosynthetic carbohydrate transported from source leaves to sink organs like seeds.
  • Improving sucrose transport is crucial for enhancing crop productivity.

Purpose of the Study:

  • To investigate the effect of enhanced sucrose loading into the phloem on rice grain yield.
  • To determine if expressing a phloem-specific sucrose transporter can improve rice productivity.

Main Methods:

  • Transgenic rice (Oryza sativa) plants were created to express the Arabidopsis sucrose transporter gene (AtSUC2) under the phloem protein2 promoter (pPP2).
  • Field trials were conducted to compare grain yield between transgenic and wild-type plants.
  • Microarray analysis was used to assess metabolic changes in leaves and grain.

Main Results:

  • Transgenic pPP2::AtSUC2 rice plants exhibited up to a 16% increase in grain yield compared to wild-type.
  • The transgenic plants developed larger spikelet hulls, resulting in larger and heavier grains.
  • Enhanced photoassimilate transport to the grain and accelerated grain filling were observed.
  • Microarray data indicated upregulated carbohydrate, amino acid, and lipid metabolism in transgenic plants.

Conclusions:

  • Enhancing sucrose loading into the phloem is a viable strategy for improving rice grain yield.
  • This approach holds promise for increasing food production to meet global demands.
  • Genetic modification of sucrose transport mechanisms can significantly impact crop productivity.