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Meiotic studies of spontaneous hybrids of Amaranthus : genome analysis
Author(s) -
Greizerstein E. J.,
Poggio L.
Publication year - 1995
Publication title -
plant breeding
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.583
H-Index - 71
eISSN - 1439-0523
pISSN - 0179-9541
DOI - 10.1111/j.1439-0523.1995.tb00830.x
Subject(s) - biology , hybrid , meiosis , pollen , interspecific hybrids , botany , amaranthus hybridus , genetics , genome , gene , weed
Abstract The meiotic behaviour of 13 spontaneous interspecific F 1 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.