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Article Addendum
Rha1, a new mutant of Arabidopsis disturbed in root slanting, gravitropism and auxin physiology
Alessio Fortunati, Silvia Piconese, Paola Tassone, Simone Ferrari and Fernando Migliaccio
volume 3 | issue 11
november 2008Subscribe to this journal for $79/year
A new Arabidopsis mutant is characterized (rha1) that shows, in the roots, reduced right-handed slanting, reduced gravitropism, and resistance to 2,4-D, TIBA, NPA and ethylene. It also shows reduced length in the shoot and root, reduced number of lateral roots and shorter siliques. The gene was cloned through TAIL-PCR and resulted in a HSF. Because none of the known gravitropic and auxinic mutants result from damage in a HSF, rha1 seems to belong to a new class of this group of mutants. Quantitative PCR analysis showed that the expression of the gene is increased by heat and cold shock, and by presence of 2,4-D in the media. Study of the expression through the GUS reporter gene revealed increased expression in clinostated and gravistimulated plants, but only in adult tissues, and not in the apical meristems of shoots and roots.
Addendum to: Fortunati A, Piconese S, Tassone P, Ferrari S, Migliaccio F. A new mutant of Arabidopsis disturbed in its roots right-handed slanting and gravitropism, defines a gene that encodes a heat-shock factor. J Exper Bot 2008; In press.
Authors
Alessio Fortunati
Institute of Agroenvironmental and Forest Biology (IBAF), Consiglio Nazionale delle Ricerche. Monterotondo (Rome) Italy
Silvia Piconese
Institute of Agroenvironmental and Forest Biology (IBAF), Consiglio Nazionale delle Ricerche. Monterotondo (Rome) Italy
Paola Tassone
Institute of Agroenvironmental and Forest Biology (IBAF), Consiglio Nazionale delle Ricerche. Monterotondo (Rome) Italy
Simone Ferrari
University of Padua, Department of Landscape and Agro-Forestal Systems, Padua, Italy
Fernando Migliaccio
Institute of Agroenvironmental and Forest Biology (IBAF), Consiglio Nazionale delle Ricerche. Monterotondo (Rome) Italy