Department of Botany and Plant Sciences, University of California, 92521, Riverside, CA, USA.
Theor Appl Genet. 1985 Jul;69(4):393-8. doi: 10.1007/BF00570908.
Allozyme surveys of cultivated plant species generally report little within-cultivar variation, but considerable among-cultivar variation. This trend contrasts with natural plant populations in which most allozyme variation resides within, rather than among, populations. The difference may be an artifact of the extreme inbreeding techniques used to develop and propagate these crops, rather than a consequence of domestication per se. To test this hypothesis, we compared the population genetic structure of 24 lines of radish cultivars - a domesticated species developed and maintained as open-pollinated, outcrossed populations - with four wild radish populations in California. Although the wild populations displayed more overall allozyme variation than the cultivars, most of the allozyme variation in the cultivars remains partitioned within, rather than among, lines. Apparently, how a crop is developed and maintained can have a profound influence on the organization of genetic variation of that species.
对栽培植物物种的同工酶调查通常报告说，品种内的变异很小，但品种间的变异相当大。这一趋势与自然植物种群形成对比，在自然植物种群中，大多数同工酶变异存在于种群内，而不是种群间。这种差异可能是由于开发和繁殖这些作物时采用的极端近亲繁殖技术造成的，而不是驯化本身的结果。为了检验这一假设，我们比较了 24 个萝卜品种的种群遗传结构-一种作为开放授粉、异交种群开发和维持的驯化物种-与加利福尼亚的四个野生萝卜种群。尽管野生种群显示出比栽培品种更多的整体同工酶变异，但栽培品种中的大多数同工酶变异仍然存在于品种内，而不是品种间。显然，作物的开发和维持方式会对该物种遗传变异的组织方式产生深远影响。
