On the Relationship of Streptanthus vernalis and Streptanthus barbiger (Brassicaceae)
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Variation of Morphology and Elemental Concentrations in the California Nickel Hyperaccumulator Streptanthus polygaloides (Brassicaceae)
The Ni hyperaccumulator Strepthanthus polygaloides (Brassicaceae) is one of a handful of Ni hyperaccumulators known from continental North America. Surveys have revealed four distinctive morphs of this species, relying primarily on floral traits (sepal color and shape): a purple sepal morph (P), a yellow sepal morph (Y), a morph in which sepals start yellow and mature to purple (Y/P), and a mor...
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Nickel hyperaccumulator plants contain at least 1,000 mg Ni/g dry mass. Their high-Ni tissues present a chemically unique resource for herbivorous insects. A prior survey of insects associated with the Ni hyperaccumulator Streptanthus polygaloides in California yielded a new species, Melanotrichus boydi Schwartz and Wall (Hemiptera: Miridae). Here we document the host preference of M. boydi. Su...
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Plants use chemical defences to reduce damage from herbivores and the effectiveness of these defences can be altered by biotic and abiotic factors, such as herbivory and soil resource availability. Streptanthus polygaloides, a nickel (Ni) hyperaccumulator, possesses both Ni-based defences and organic defences (glucosinolates), but the extent to which these defences interact and respond to envir...
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A better understanding of the habitat requirements of Streptanthus bracteatus, a rare annual of central Texas woodlands, is critical to attempts to establish new populations, and may also help manage existing ones. We conducted a transplant experiment to determine the effects of different amounts of cover on the performance of this species. A range of covers was provided by pruning existing woo...
متن کاملThe Rare, Serpentine Endemic Streptanthus morrisonii (Brassicaceae) Species Complex, Revisited Using Isozyme Analysis
The Streptanthus morrisonii (Brassicaceae) complex is a group of six narrowly-distributed obligate serpentine endemic taxa whose habitat is threatened by geothermal development. Isozyme analysis of this little-studied complex supports the delineation of two species, S. morrisonii and S. brachiatus, but is at odds with the treatment of two subspecies based on morphology. These results may be inf...
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ژورنال
عنوان ژورنال: Madroño
سال: 2009
ISSN: 0024-9637
DOI: 10.3120/0024-9637-56.1.43