By Donald A. Levin
This ebook offers a considerate and unique reassessment of our knowing of plant speciation and extinction, by means of one of many major staff on plant evolution. it really is appropriate to be used in seminars commonly in departments of botany or plant sciences, and may even be learn by means of employees attracted to speciation mechanisms and ecological succession on the group and panorama degrees.
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Extra info for The Origin, Expansion, and Demise of Plant Species (Oxford Series in Ecology and Evolution)
Example text
The aberrant plants fail to breed true, with progeny being normal or having different aberrant merisms that vary within and between plants. An allotetraploid of the aforementioned hybrid also displays meristic abnormalities. Is developmental instability of any evolutionary significance? Can the meristic novelties be stabilized? If the expressions released through developmental instability have adaptive value, they may be favored by selection, their pene- Speciation: The Ecological Transition 37 trance and expressivity enhanced, and the expressions stabilized.
The syndrome also includes the suppression of apical dominance, profuse branching, and dwarfism. The "corky" syndrome is based on the genotype ck* ck*; the former allele comes from G. hirsutum and the latter comes from G. barbadense. First-generation hybrids between Oryza breviligulatus and O. glaberrima often are weak. This condition is controlled by two complementary dominant genes, W1] and W2, that are common in O. breviligulatus and O. glaberrima, respectively (Chu and Oka, 1972). Two complementary dominant lethals are responsible for chlorosis in hybrids between varieties of 0.
This sequence is well documented in Argyranthemum (Francisco-Ortega, Jansen, and SantosGuerra, 1996a) of the Canary Islands, and Tetramolopium (Lowrey, 1995), Schiedea (Wagner, Weller, and Sakai, 1995) and in the silverswords (Argyroxiphium) (Baldwin and Robichaux, 1995) of Hawaii. The Hawaiian Tetramolopium lineage has T. humile as its basal species (Lowrey, 1995). This species occurs only in alpine and subalpine habitats on Hawaii and Maui, and occupies an ecological niche equivalent to its putative ancestor, which is found in New Guinea.