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Root-targeted biotechnology to mediate hormonal signaling and improve crop stress tolerance

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Keywords
  • Life Sciences :: Biotechnology [F06]
  • Sciences Du Vivant :: Biotechnologie [F06]
Disciplines
  • Biology
  • Communication
  • Ecology
  • Engineering
  • Geography

Abstract

REVIEW Root-targeted biotechnology to mediate hormonal signalling and improve crop stress tolerance Michel Edmond Ghanem • Ime`ne Hichri • Ann C. Smigocki • Alfonso Albacete • Marie-Laure Fauconnier • Eugene Diatloff • Cristina Martinez-Andujar • Stanley Lutts • Ian C. Dodd • Francisco Pe´rez-Alfocea Received: 17 November 2010 / Revised: 7 January 2011 / Accepted: 7 January 2011 � Springer-Verlag 2011 Abstract Since plant root systems capture both water and nutrients essential for the formation of crop yield, there has been renewed biotechnological focus on root system improvement. Although water and nutrient uptake can be facilitated by membrane proteins known as aquaporins and nutrient transporters, respectively, there is a little evidence that root-localised overexpression of these proteins improves plant growth or stress tolerance. Recent work suggests that the major classes of phytohormones are involved not only in regulating aquaporin and nutrient transporter expression and activity, but also in sculpting root system architecture. Root- specific expression of plant and bacterial phytohormone- related genes, using either root-specific or root-inducible promoters or grafting non-transformed plants onto constitu- tive hormone producing rootstocks, has examined the role of root hormone production in mediating crop stress tolerance. Root-specific traits such as root system architecture, sensing of edaphic stress and root-to-shoot communication can be exploited to improve resource (water and nutrients) capture and plant development under resource-limited conditions. Thus, root system engineering provides new opportunities to maintain sustainable crop production under changing environmental conditions. Keywords Abiotic stress � Root-to-shoot signalling � ABA � Cytokinins � ACC � Grafting � IPT � Plant growth promoting rhizobacterium Introduction The Green Revolution has substantially improved world- wide food production, especiall

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