Year: 1975
Type: article
Abstract: SUMMARYGamma rays emitted by radioactive particles of Co60″, are highly mutagenic. It can not only induce gene mutation but also act as a powerful agent in chromosome and chromatid breakage. A balery plant with 53% pollen and 71% ovule sterility was obtained in the progeny grown from seeds irradiated with 15,000r. Subsequently, this plant produced fewer mature seeds. Meiotic analysis of the microsporocytes collected from this plant showed two isochromosomes, more frequently associated with a ring of four chromosomes than without it. Cytological study of the somatic metaphase, prepared from leaf sheath meristems of the same heterozygous plant revealed a few centromeric breaks adding support to the occurrence of isochromosomes.A chromatid break detected in the same leaf sheath mitosis lent support to the occurrence of deficiency of a small chromosome arm, observed at late diplotene. In the progeny of this plant, two mutant forms were obtained. The liguleless-auricleless mutant has inherited as a single recessive trait; and the grass like mutant is suspected to be due to the deficiency.
Source: Caryologia
Author: B.C. Goswami
Institution: Gauhati University
Language: English
Subfield: Plant Science
Domain: Life Sciences
SDG: Zero hunger
Open Access status: gold
Estimated APC paid: $161
OpenAlex ID: W2313138276