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Engineering Photoassimilate Partitioning in Tobacco Plants Improves Growth and Productivity and Provides Pathogen Resistance by Isabel Murillo; Ramón Roca; Cristina Bortolotti; Blanca San Segundo is a Agricultural and Biological Sciences article available to read on EtoBox.

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## Summary Expression of pathogenesis‐related (__PR__) genes is part of the plant's natural defense response against pathogen attack. To study the __in vivo__ role and function of the maize PRms protein, tobacco plants were transformed with the __PRms__ cDNA under the control of the CaMV35S promoter. Transgenic tobacco plants grow faster and yield more leaf and seed biomass. By using immunoelectron microscopy, we found that PRms is associated with plasmodesmata in leaves of transgenic tobacco plants. Furthermore, we found that activation of sucrose efflux from photosynthetically active leaves and accumulation of higher levels of sucrose in leaf tissues are characteristic features of PRms tobacco plants. This, in turn, results in the constitutive expression of endogenous tobacco __PR__ genes and resistance to phytopathogens. The expression of multiple plant defense genes can then be achieved by using a single transgene. These data provide a new approach for engineering disease‐resistant plants while simultaneously improving plant yield and productivity through the modification of photoassimilate partitioning.

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Author

Isabel Murillo; Ramón Roca; Cristina Bortolotti; Blanca San Segundo

Publisher

John Wiley and Sons; Wiley (Blackwell Publishing); Blackwell Publishing Inc.; Wiley (ISSN 0960-7412)

Published

2003

Language

EN

Field

Agricultural and Biological Sciences (Life Sciences)