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CYTOGENETIC STUDIES OF CARTHAMUS SPECIES (COMPOSITAE) WITH 32 PAIRS OF CHROMOSOMES
Author(s) -
Khidir M. Osman,
Knowles P. F.
Publication year - 1970
Publication title -
american journal of botany
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.218
H-Index - 151
eISSN - 1537-2197
pISSN - 0002-9122
DOI - 10.1002/j.1537-2197.1970.tb09797.x
Subject(s) - biology , achene , pollen , bract , carthamus , hybrid , botany , chiasma , meiosis , chromosomal translocation , metaphase , chromosome , inflorescence , genetics , gene , medicine , traditional medicine
Two taxa of Carthamus , each with 32 pairs of chromosomes, merit specific status. C. baeticus (Boiss. & Reut.) Nym. is found on islands of and in countries surrounding the Mediterranean Sea, whereas C. turkestanicus Popov extends from western Turkey to Kashmir. Compared to C. baeticus, C. turkestanicus has wider leaves, wider and less divaricate bracts, larger heads with more florets and achenes, and florets with longer lobes. Their chromosomes differ to the extent that microsporocytes of their F 1 hybrids had a reciprocal translocation in pachytene and a mean of over six, and up to 22, univalents at metaphase I. Pollen stainability and seed fertility were reduced in F 1 hybrids.