Blakeslee, Albert Francis, 1874–1954, American botanist, b. Genesee, New York. He received his Ph.D. at Harvard (1904) and was a member of the faculty until 1907. After several years as professor at Connecticut Agricultural College (now the Univ. of Connecticut), he joined the staff of the Carnegie Institution of Washington at Cold Spring Harbor, N.Y., and later served as its director (1936–41). In 1943 he became director of the Smith College Genetics Experiment Station. From his earliest research, the discovery of sexual reproduction in bread molds, his contributions to botany and genetics were of far-reaching significance. His study of the inheritance and geographical distribution of the jimson weed, Datura, provided important information concerning chromosome behavior, genic balance, and species evolution. He introduced the use of the alkaloid colchicine to increase the number of chromosomes in the plant cell.

Blakeslee, Albert Francis

(born Nov. 9, 1874, Geneseo, N.Y., U.S.—died Nov. 16, 1954, Northampton, Mass.) U.S. botanist and geneticist. He received his Ph.D. from Harvard University. In his dissertation he became the first person to describe sexuality in the lower fungi. His later experimental work focused on higher plants. After a long tenure with the Carnegie Institution's Cold Spring Harbor Laboratory (1915–41), he joined the faculty of Smith College, where he published a series of papers on the genetics and cell biology of jimsonweed. He used the alkaloid colchicine to achieve an increase in the number of chromosomes and thus opened up a new field of artificially produced polyploids.

Blakeslee, Albert Francis (1874–1954) botanist; born in Geneseo, N.Y. After teaching in several American institutions and serving on collecting expeditions in Venezuela (1903) and Europe (1904–06), he became a professor at the Connecticut Agricultural College (1907–15). He then joined the Carnegie Station for Experimental Evolution, Cold Spring Harbor, N.Y. (1912–41, director 1936–41). He moved to Columbia University (1940–52), then Smith College (1942–54). Blakeslee used the chemical colchicine to induce polyploidy (multiplication of the number of chromosomes) to produce extra-large flowers, thus enabling commercial production of seeds for giant blooms. He also investigated sexuality in the common bread mold and mutations in Jimson weed, and he studied the inheritance of taste and smell.