Data/hora: 17/06/2024 15:59:49

Biblioteca(s): | Embrapa Mandioca e Fruticultura.
Data corrente: | 27/05/1997
Data da última atualização: | 17/05/2023
Autoria: | RAJA, V. G.; KOUL, K. K.; RAINA, S. N.; PARIDA, A.
Afiliação: | Universidade of Delhi, Delhi-India.
Título: | Ploidy-dependent genomic stability in the tissue cultures of ornamental phlox drummondii Hook.
Ano de publicação: | 1992
Fonte/Imprenta: | Plant cell reports v. 12, p. 12-17, 1992.
Idioma: | Inglês
Conteúdo: | Comparisons of the chromosome numbres, 2C nuclear DNA amounts and karyomorphology were made in explant cultures of diploid (2n = 2x = 14) and autotetraploid (2n = 4x = 28) Phox drummondii. In 6-36 week old calli derived from diploid internodal segment explants, and in cells of root tips regenerated from such callus, marked differences were observed in chromesome number. The chromosome numbers ranged from 2n = 14 to 2n = 100 and DNA amounts from 8.20 to 63.20 pg in the diploid derived callus, while the extent of variation was much reduced in the regenerated roots. In contrast, the autotetraploid cultures were characterised by the maintenance of the same chromosome number and DNA amounts as the mother plant. Modified chromosome structures were not apparent in any of the cultures. The possible reasons for the chromosomal instability at the diploid level and stability at the tetraploid level are discussed.
Thesagro: | Cultura de Tecido.
Categoria do assunto: | --
Registro original: | Embrapa Mandioca e Fruticultura (CNPMF)
Exemplares: | CNPMF - (16904-1) - ADC - AP - DD - Publicação digital -  -  - DIS