Originally, crop plants may have been restricted by oceans, mountains, and deserts. Humans have transported many of them where they would not have gone naturally. There are various kinds of culture methods including tissue culture, cell culture, hairy root cultures. Plant species Plant species are not defined well by reproductive barriers as in many groups of animals. Polyploids are often derived from diploid ancestors.
Many hybrids occur between related plant species.
Botanists tend to consider a species to be a group of populations that are derived from a single ancestor and which can. Be distinguished morphologically from other groups of populations. Often cultivated plants have been given different names than their wild progenitors. One of the big problems is deciding what are the wild progenitors of cultivated plants. The species name has two parts.