Zytologische Studien an Allium Schoenoprasum

The Different Stability of Chromosomes and the Nature of Mitosis

“…The principal works demonstrating our conception of the direct effect of X-rays on the chromosomes are the following: For mitotic chromosomes LEVITSKY and ARARATIAN (193l), STONE (1933), MATHER and STONE (1933), HUSKINS and HUNTER (1935), WHITE (1935); for meiotic chromosomes STONE (1933), MATHER (1934) and LEVAN (1936). See also HELVIG (1934) and especially POLITZEJ.…”

“…»There is no obvious reason why irradiation should cause ends of chromosomes to enter into permanent union.» -»On the other hand, our observations indicate that whenever a break occurs in a single chromatid the two ends possess an unsatisfied attraction force and tend to unite with any chromatid which happens to be near them» (pp. [29][30]. According to my extensive studies, MATHER and STONE are right.…”

Inheritance of Bulb Formation in Allium schoenoprasum L.

“…The species is highly polymorphous, being widely distributed throughout the world (Levan, 1936) and many ecotypes and varieties exist (Poulsen, 1990;Stearn, 1978).…”