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Alternative cytoplasmic male sterility systems in sorghum and their utilization

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Relation http://oar.icrisat.org/4328/
 
Title Alternative cytoplasmic male sterility systems in sorghum and their utilization
 
Creator Reddy, B V S
Ashok Kumar, A
Kaul, S L
 
Subject Sorghum
 
Description In sorghum, Stephen and Holland (1954) discovered cytoplasmic male sterility
(CMS) designated as milo cytoplasm in the progenies of a cross between two
cultivars, milo and combine kafi r, with milo as the female and kafi r as the male.
Male-sterile plants to the extent of 25% were observed in the F2 generation of the
above cross when milo was used as female and not as male. The male-sterile
segregants from this cross produced male-sterile hybrids when crossed with the
kafi r parent and fully fertile hybrids when crossed with the milo parent. Thus, it was
recognized that kafi r could be used as a maintainer of this source of CMS. Since
the progeny received the cytoplasm from the female, it was hypothesized that the
milo parent had a male sterility-inducing cytoplasm and dominant genes for pollen
fertility, whereas the combine kafi r parent contained a normal (fertile) cytoplasm
but the recessive male-sterile genes. All progenies of the milo×combine kafi r cross
contained milo (sterility-inducing) cytoplasm, but those that also inherited the
homozygous recessive genes from the kafi r parent were male-sterile. The malesterile
plants in the milo×combine kafi r cross were used as females in repeated
backcrossing with kafi r as the male parent. At the end of seven backcrosses, the
entire genome of kafi r was transferred into the milo cytoplasm. This resulted in
two morphologically similar versions of the combine kafi r (CK 60) parent: a malesterile
combine kafi r (CK 60A) and a male-fertile combine kafi r (CK 60B). The
male-sterile lines are designated as A-lines and their maintainer lines as B-lines.
Subsequently, several sources of CMS systems (A1, A2, A3, A4, A5 and A6) (Table
13) were discovered.
 
Publisher International Crops Research Institute for the Semi-Arid Tropics, Patancheru 502 324, Andhra Pradesh, India
 
Date 2008
 
Type Book Section
PeerReviewed
 
Format application/pdf
 
Language en
 
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Identifier http://oar.icrisat.org/4328/1/Alternative_cytoplasmic_male_sterility_systems_in_sorghum_and_their_utilization.pdf
Reddy, B V S and Ashok Kumar, A and Kaul, S L (2008) Alternative cytoplasmic male sterility systems in sorghum and their utilization. In: Sorghum improvement in the new millennium. International Crops Research Institute for the Semi-Arid Tropics, Patancheru 502 324, Andhra Pradesh, India, Patancheru, Andhra Pradesh, India, pp. 132-144. ISBN 978-92-9066-512-0