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Annals of Botany 86: 975-981, 2000
© 2000 Annals of Botany Company

New Gene Crt(Curly Roots) Controlling Pea (Pisum sativum L.) Root Development

V. E. Tsyganov+, Z. B. Pavlova, L. V. Kravchenko, S. M. Rozov, A. Y. Borisov, L. A. Lutova and I. A. Tikhonovich

All-Russia Research Institute for Agricultural Microbiology, Podbelsky Chaussee 3, St. Petersburg, Pushkin 8, 189620, Russia Department of Genetics and Breeding, St. Petersburg State University, Universitetskaya embankment 7/9, St. Petersburg, 199034, Russia Institute of Cytology and Genetics, Lavrent’ev avenue 10, Novosibirsk, 630090, Russia

Received: 26 April 2000 ; Returned for revision: 2 June 2000 . Accepted: 12 July 2000

Using ethyl methane sulfonate (EMS) treatment of the seeds of line SGE, a new mutant of pea (Pisum sativum L.) with alterations in root development was obtained. The mutant phenotype depends on the density of the growth substrate: on sand (a high density substrate) the mutant forms a small compact curly root system whereas on vermiculite (a low density substrate) differences between the root systems of the mutant and wild type plants are less pronounced. Genetic analysis revealed that the mutant carries a mutation in a new pea gene designedcrt (curly roots). Gene crt has been localized in pea linkage group V. The mutant line named SGEcrt showed increased sensitivity to exogenous auxin and an increased concentration of endogenous indole-3-acetic acid (IAA) in comparison with the wild type line SGE. Copyright 2000 Annals of Botany Company

Pisum sativum L., root development, garden pea mutant, curly roots, auxin, environmental stimulus response


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