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Plants 2018, 7(4), 108;

From A. rhizogenes RolD to Plant P5CS: Exploiting Proline to Control Plant Development

Department of Biology and Biotechnology, Sapienza University of Rome, 00185 Rome, Italy
Author to whom correspondence should be addressed.
Received: 12 October 2018 / Revised: 27 November 2018 / Accepted: 1 December 2018 / Published: 6 December 2018
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The capability of the soil bacterium Agrobacterium rhizogenes to reprogram plant development and induce adventitious hairy roots relies on the expression of a few root-inducing genes (rol A, B, C and D), which can be transferred from large virulence plasmids into the genome of susceptible plant cells. Contrary to rolA, B and C, which are present in all the virulent strains of A. rhizogenes and control hairy root formation by affecting auxin and cytokinin signalling, rolD appeared non-essential and not associated with plant hormones. Its role remained elusive until it was discovered that it codes for a proline synthesis enzyme. The finding that, in addition to its role in protein synthesis and stress adaptation, proline is also involved in hairy roots induction, disclosed a novel role for this amino acid in plant development. Indeed, from this initial finding, proline was shown to be critically involved in a number of developmental processes, such as floral transition, embryo development, pollen fertility and root elongation. In this review, we present a historical survey on the rol genes focusing on the role of rolD and proline in plant development. View Full-Text
Keywords: plant development and organogenesis; proline biosynthesis; RolD; rol genes plant development and organogenesis; proline biosynthesis; RolD; rol genes

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Trovato, M.; Mattioli, R.; Costantino, P. From A. rhizogenes RolD to Plant P5CS: Exploiting Proline to Control Plant Development. Plants 2018, 7, 108.

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