Enzyme electrophoresis was employed to assess genetic diversity within and divergence between Lemna disperma and Lemna gibba, sister species that have often been considered conspecific because of the few technical morphological characters distinguishing them. L. gibba is distributed widely except in Australia and New Zealand, where it is replaced by L. disperma. Allozyme data were employed to e...

The Canary Islands are an Atlantic volcanic archipelago with a rich flora of ∼570 endemic species. The endemics represent ∼40% of the native flora of the islands, and ∼20% of the endemics are in the E (endangered) category of the International Union for Conservation of Nature. A review of allozyme variation in 69 endemic species belonging to 18 genera and eight families is presented. The averag...

ABSTRACT The temporal and spatial patterns of Phytophthora infestans population genetic structure were analyzed in the Del Fuerte Valley, Sinaloa, Mexico, during the crop seasons of 1994 to 1995, 1995 to 1996, and 1996 to 1997 by geographical information systems. Isolates of P. infestans were obtained from infected tissue of tomato and potato collected from two areas: (i) where both potatoes an...

A study was designed to sample and characterize 12 populations of wild emmer wheat in Jordan at the high-molecular-weight (HMW) glutenin and allozyme levels. Data were collected and individual plants were sampled from 207 permanent sampling points in three central, three peripheral, and six marginal populations during all or part of a five-year study period. Patterns of variation, based on four...

Yi-Chih Chien and Glen E. Collier (1997) Biochemical comparison of arginine kinase allozymes in Drosophila melanogaster. Zoological Studies 36(4): 277-287. ARKs is a rare arginine kinase allozyme found in natural populations of Drosophila melanogaster. To test whether the rarity of this allozyme could be due to its biochemical impairment relative to the common allozyme, biochemical properties s...