How could we progress in the knowledge of the mechanisms that govern the adventitious root formation from aerial plant tissues?
1998
Dubroux, L. | Ermel-Fontaine, F. | Breton, C. | Charpentier, J.P. | Capelli, P. | Bruant, B. | Label, P. | Couee, I. | Jay-Allemand, C. (INRA, Orleans (France). Unite d'amelioration, genetique et physiologie forestieres)
Rhizogenesis is a complex multistep process that still remains widely unknown in terms of physiological mechanisms. Nevertheless, the anatomy of primary and lateral roots is now well-described in some species, including the very early steps during which the primordia are formed. The cellular origin of these organs is also well-determined and the genetic basis of their development begins to be studied at a molecular level. By contrast, the knowledge of adventitious root formation is poor, even if numerous factors influencing this developmental process were studied since several decades. The past studies allowed to discriminate several developmental stages of adventitious root formation, on the basis of morphological and biochemical parameters, but no cellular mechanisms are today suggested to explain induction, initiation or cell organization of the adventitious root meristem. The trends in molecular biology and molecular genetics (discovery of root-specific genes) will allow us to make a giant leap in both the molecular control of root development and the production of "super-root" plants, useful for agriculture. For this, it will be necessary to develop very integrated studies using in situ approaches to understand the biochemical processes at a cellular level as well as genetic transformation to evaluate the impact of different candidate genes/proteins in adventitious root formation.
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