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The Journal of Heredity 2000:91(3)
© 2000 The American Genetic Association 91:228-233

Inheritance of UB-B tolerance in seven ecotypes of Arabidopsis thaliana L. Heynh. and their F1 hybrids

J Torabinejad, and MM Caldwell*

Department of Rangeland Resources and the Ecology Center, Utah State University, Logan, UT 84322-5230, USA *Corresponding author E-mail: mmc@cc.usu.edu

We used a partial diallel mating design to examine morphologic response to supplementary ultraviolet-B (UV-B) radiation of seven ecotypes of Arabidopsis thaliana L. Heynh. from several geographic locations in Europe. We were particularly interested in the inheritance of UV-B tolerance by the F1 generation. Morphologic traits included plant height, rosette diameter, number of shoots and branches and reproductive and vegetative dry mass. To effect a large difference in UV treatments, plants under treatment received 11 kJ/m2 day of biologically effective UV-B radiation while control plants received no UV-B radiation. Genotype effects were observed for all traits (P<.0001), but a significant treatment effect and genotype x treatment interactions were detected only for plant height (P<.0001), rosette diameter (P=.002), and vegetative (P=.0260) and reproductive dry mass (P=.0900). General combining ability was significant for plant height (P<.0001) and vegetative mass (P=.0563), whereas specific combining ability was significant for rosette diameter (P=.0220) and vegetative mass (P=.0506). These results suggest that both pure lines and hybrids of Arabidopsis can be developed for greater tolerance of UV-B radiation. Similar findings for crop species might lead to the development of UV tolerant varieties.


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