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All hermaphrodite progeny are derived by self‐pollinating the sunrise papaya mutant
Author(s) -
ChanTai C.,
Yen C.R.,
Chang L.S.,
Hsiao C.H.,
Ko T.S.,
Weber W. E.
Publication year - 2003
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 - 10.1046/j.1439-0523.2003.00812.x
Subject(s) - hermaphrodite , biology , mutant , genotype , botany , pollination , cultivar , ploidy , seedling , allele , horticulture , gene , genetics , pollen
Self‐pollination of a hermaphroditic cultivar normally gives a ratio of 2 : 1 hermaphrodite to female papayas with genotypes M 2 m and mm , respectively. Much effort has been dedicated to marking the sexual types of papaya at the seedling stage to distinguish hermaphroditic from female papayas. A hermaphroditic papaya mutant (SR*) has been obtained, derived from the ‘Sunrise’ papaya cultivar mutant. Self‐pollination of the mutant resulted in all progenies being hermaphroditic. The genotype of the female was lethal, as a result of a lethal gene being linked to the mm female gene complex in this case. However, a 3 : 1 segregation ratio was obtained from the progeny of the hermaphroditic cultivar ‘Thailand’ crossed with SR*, indicating that all genotypes survived. Homozygous genotypes (M 2 M 2 ) would be lethal according to Storey's model. Randomly selected F1 plants of the ‘Thailand’ SR* combination were self‐pollinated to obtain an F 2 generation. The F 2 segregation ratio suggested that the SR* mutant had a different form of the M 2 allele, now designated as M @ , which allowed the dominant M @ M 2 to survive in cross combinations. Genetic study has proved that SR* has the M @ ml genotype, a new mutant. It is capable of producing all hermaphroditic papaya progenies.