Premium
Fertility Restoration of the Sorghum A3 Male‐Sterile Cytoplasm through a Sporophytic Mechanism Derived from Sudangrass
Author(s) -
Tang Hoang V.,
Pedersen Jeffrey F.,
Chase Christine D.,
Pring Daryl R.
Publication year - 2007
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/cropsci2006.08.0542
Subject(s) - biology , backcrossing , fertility , cytoplasmic male sterility , genetics , sterility , botany , pollen , allele , gene , population , demography , sociology
Fertility restoration of sorghum [ Sorghum bicolor (L.) Moench] lines carrying the IS1112C (A3 group) male‐sterile cytoplasm has been documented as a two‐gene gametophytic mechanism involving complementary action of restoring alleles designated Rf3 and Rf4 , as derived from IS1112C. Fertility restoration capability has also been reported from sudangrass ( S. bicolor subsp. drummondii ) populations. We describe characteristics of a fertility restoration system derived from sudangrass, in which male‐sterile individuals were observed at high frequency in backcross and F 2 ‐F 3 segregating populations. Segregation analyses were consistent with a sporophytic restoration system involving two complementary genes. Pollen iodine staining in fertile progeny indicated that the restorers were not efficacious, and fertility was decreased in progeny of backcrosses. Silencing of restoring alleles through paramutation might be operative in these examples. Sudangrass‐derived fertility restoration did not involve enhanced transcript processing of the chimeric mitochondrial open reading frame orf107 Thus male sterility induced by the A3 cytoplasm can be restored through different mechanisms.