Meiotic studies of spontaneous hybrids of Amaranthus: genome analysis
The meiotic behaviour of 13 spontaneous interspecific F1 hybrids of Amaranthus was studied. The hybrids between species with n= 16 chromosomes had 16 bivalents but varied considerably in pollen stainability (0–55%). These results suggest the existence of cryptic structural hybridity. The hybrids inv...
Guardado en:
| Autores principales: | , |
|---|---|
| Formato: | JOUR |
| Materias: | |
| Acceso en línea: | http://hdl.handle.net/20.500.12110/paper_01799541_v114_n5_p448_Greizerstein |
| Aporte de: |
| id |
todo:paper_01799541_v114_n5_p448_Greizerstein |
|---|---|
| record_format |
dspace |
| spelling |
todo:paper_01799541_v114_n5_p448_Greizerstein2023-10-03T15:08:35Z Meiotic studies of spontaneous hybrids of Amaranthus: genome analysis Greizerstein, E.J. Poggio, L. Amaranthus basic chromosome number genome analysis homeology hybrids meiotic behaviour polyploidy pseudocereal The meiotic behaviour of 13 spontaneous interspecific F1 hybrids of Amaranthus was studied. The hybrids between species with n= 16 chromosomes had 16 bivalents but varied considerably in pollen stainability (0–55%). These results suggest the existence of cryptic structural hybridity. The hybrids involving A. cruentus (n = 17) and species with n = 16 (A. caudatus and A. quitensis) always formed 15II+1 III with very low pollen stainability (5–7%). Further observations indicated that Amaranthus species are allotetraploids with basic numbers of x= 8 and x= 9 but exhibit x= 16 and x= 17 as secondary basic numbers, as demonstrated by (a) the frequent presence of 811 + 171 in the meiosis of the hybrid A. spinosus (n = 17) × A. hybridus (n= 16); and the occurrence of secondary associations between bivalents in MI. Genomic formulae are proposed for each species, on the basis of the meiotic behaviour of the hybrids studied. Copyright © 1995, Wiley Blackwell. All rights reserved Fil:Greizerstein, E.J. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Poggio, L. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_01799541_v114_n5_p448_Greizerstein |
| institution |
Universidad de Buenos Aires |
| institution_str |
I-28 |
| repository_str |
R-134 |
| collection |
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| topic |
Amaranthus basic chromosome number genome analysis homeology hybrids meiotic behaviour polyploidy pseudocereal |
| spellingShingle |
Amaranthus basic chromosome number genome analysis homeology hybrids meiotic behaviour polyploidy pseudocereal Greizerstein, E.J. Poggio, L. Meiotic studies of spontaneous hybrids of Amaranthus: genome analysis |
| topic_facet |
Amaranthus basic chromosome number genome analysis homeology hybrids meiotic behaviour polyploidy pseudocereal |
| description |
The meiotic behaviour of 13 spontaneous interspecific F1 hybrids of Amaranthus was studied. The hybrids between species with n= 16 chromosomes had 16 bivalents but varied considerably in pollen stainability (0–55%). These results suggest the existence of cryptic structural hybridity. The hybrids involving A. cruentus (n = 17) and species with n = 16 (A. caudatus and A. quitensis) always formed 15II+1 III with very low pollen stainability (5–7%). Further observations indicated that Amaranthus species are allotetraploids with basic numbers of x= 8 and x= 9 but exhibit x= 16 and x= 17 as secondary basic numbers, as demonstrated by (a) the frequent presence of 811 + 171 in the meiosis of the hybrid A. spinosus (n = 17) × A. hybridus (n= 16); and the occurrence of secondary associations between bivalents in MI. Genomic formulae are proposed for each species, on the basis of the meiotic behaviour of the hybrids studied. Copyright © 1995, Wiley Blackwell. All rights reserved |
| format |
JOUR |
| author |
Greizerstein, E.J. Poggio, L. |
| author_facet |
Greizerstein, E.J. Poggio, L. |
| author_sort |
Greizerstein, E.J. |
| title |
Meiotic studies of spontaneous hybrids of Amaranthus: genome analysis |
| title_short |
Meiotic studies of spontaneous hybrids of Amaranthus: genome analysis |
| title_full |
Meiotic studies of spontaneous hybrids of Amaranthus: genome analysis |
| title_fullStr |
Meiotic studies of spontaneous hybrids of Amaranthus: genome analysis |
| title_full_unstemmed |
Meiotic studies of spontaneous hybrids of Amaranthus: genome analysis |
| title_sort |
meiotic studies of spontaneous hybrids of amaranthus: genome analysis |
| url |
http://hdl.handle.net/20.500.12110/paper_01799541_v114_n5_p448_Greizerstein |
| work_keys_str_mv |
AT greizersteinej meioticstudiesofspontaneoushybridsofamaranthusgenomeanalysis AT poggiol meioticstudiesofspontaneoushybridsofamaranthusgenomeanalysis |
| _version_ |
1807319512597397504 |