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Inheritance of Genic Sterility in Cultivated Safflower 1
Author(s) -
Carapetian Jirair,
Knowles P. F.
Publication year - 1976
Publication title -
crop science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.76
H-Index - 147
eISSN - 1435-0653
pISSN - 0011-183X
DOI - 10.2135/cropsci1976.0011183x001600030020x
Subject(s) - biology , sterility , carthamus , pollen , locus (genetics) , allele , anthesis , genotype , cultivar , botany , horticulture , genetics , gene , medicine , traditional medicine
Vegetatively normal but reproductively sterile safflower ( Carthamus tinctorius L.) plants were observed in segregating generations (F 2 , F 3 , BC 1 F 2 , and BC 1 F 3 ) of crosses involving the cultivar ‘US‐10’ and an introduction from India, 57‐147. Seed heads appeared pinched because of shorter florets at anthesis and an absence of seeds. Different methods of classification, namely, the morphological appearance of flowering heads, seed set under self‐ and open‐pollination, and the morphology and stainability of pollen grains were used to identify the sterile plants under field and greenhouse conditions. Data strongly support the involvement of three unlinked nuclear genes in the inheritance of sterility. It is proposed that US‐10 and 57‐147, respectively, have the genotypes AAbbcc and aaBBCC . Sterility occurs when a homozygous recessive allele at the A locus interacts with a homozygous recessive allele at either the B or C locus. As expected, F 2 families segregating at the three loci gave a good fit to a 57:7 (fertile:sterile) ratio in which the sterile genotypes are aabbC ‐, aaB‐cc , and aabbcc .