Joseph Gottlieb Kolreuter

碍枚濒谤别耻迟别谤 made experimental plant crosses like those of , however he did not do any numerical analysis. His interpretations used alchemical ideas and he did not seek to examine the nature of heritability or heritable traits.

Joseph Gottlieb 碍枚濒谤别耻迟别谤 (1733鈥�1806) was a German botanist whose controlled experiments helped establish the scientific study of plant hybridization. 碍枚濒谤别耻迟别谤 joined the Imperial Academy of Sciences in St. Petersburg, Russia, in 1756. He began experiments on plant reproduction in 1759, returned to Germany in 1761, and accepted an appointment at Karlsruhe, Baden in 1764. 碍枚濒谤别耻迟别谤鈥檚 best-known experiments involved crosses between two species of tobacco, Nicotiana rustica and N. paniculata. These hybrids had characteristics intermediate between those of their parents, which provided strong experimental evidence that both pollen and ovule contributed to the offspring. He investigated reciprocal crosses, hybrid fertility, and the effects of repeated generations of backcrosses of hybrids to their parental species. He also studied the structure of flowers and pollen, and the role of insects in pollination. His publications established interspecies hybridization a systematic experimental subject, rather than a horticultural curiosity.

Although often cited as a precursor to Mendel, he did not make numerical analyses of the inheritance of discrete characters, and his main target was the relative contributions of parental reproductive substances. Nevertheless, he established methods on which later nineteenth-century investigators like Mendel could build.

糖心APP