Open Access. Powered by Scholars. Published by Universities.®
Articles 1 - 2 of 2
Full-Text Articles in Entire DC Network
The Auxin Transport Inhibitor N-(1-Naphthyl)Phthalamic Acid Elicits Pseudonodules On Nonnodulating Mutants Of White Sweetclover, C. Wu, R. Dickstein, A. J. Cary, J. H. Norris
The Auxin Transport Inhibitor N-(1-Naphthyl)Phthalamic Acid Elicits Pseudonodules On Nonnodulating Mutants Of White Sweetclover, C. Wu, R. Dickstein, A. J. Cary, J. H. Norris
Biological Sciences Faculty Publications
The collection of symbiotic (sym) mutants of white sweetclover (Melilotus alba Desr.) provides a developmental sequence of mutants blocked early in infection or nodule organogenesis. Mutant phenotypes include non-nodulating mutants that exhibit root-hair deformations in response to Rhizobium meliloti, mutants that form ineffective nodules lacking infection threads, and mutants that form infection threads and ineffective nodules. Mutant alleles from both the sym-1 and the sym-3 loci exhibited a non-nodulating phenotype in response to R. meliloti, although one allele in the sym-1 locus formed ineffective nodules at a low frequency. Spot-inoculation experiments on a non-nodulating allele in the sym-3 locus indicated …
Timing Of Metamorphosis In A Freshwater Crustacean: Comparison With Anuran Models, Saran Twombly
Timing Of Metamorphosis In A Freshwater Crustacean: Comparison With Anuran Models, Saran Twombly
Biological Sciences Faculty Publications
Many crustaceans have complex life cycles characterized by a metamorphosis, yet variation in metamorphic traits, and the causes and consequences of this variation, have rarely been examined. Food concentrations were changed during specific larval stages of the freshwater copepod Mesocyclops edax Forbes (Copepoda: Cyclopoida) to examine whether age and size at metamorphosis remain flexible or become fixed during the larval period. Results were compared to predictions of both flexible (the Wilbur—Collins model) and fixed (Leips—Travis model) rate models for the timing of amphibian metamorphosis. Age and size at metamorphosis were variable in all treatments, and age was always more variable …