Articles
INHERITANCE OF A MALE STERILE APETALOUS INFLORESCENCE IN ZINNIA ELEGANS
Article number
272_4
Pages
37 – 40
Language
Abstract
This study was conducted to determine the inheritance of a male sterile apetalous inflorescence in Zinnia elegans.
Four apetalous male sterile lines.
MS1 – MS4 and 3 fertile, petaled lines, MF1 – MF3 were selected and crossed.
Select F2, BC-MS (backcross to the male sterile) and BC-MF (backcross to fertile parent) generations from the 12 MS x MF cross combinations were evaluated for their MS:MF segregation.
All MS:MF ratios were evaluated by X2. MS:MF ratios of 1:63, 1:15 and 1:3 and mixed model ratios were observed in the F2 generations.
All BC-MF crosses resulted in 100% fertile, normal petaled plants.
A 3 gene recessive model has been presented as an explanation for the male sterile results obtained.
In this model the male sterile genotype is ms1ms1ms2ms2ms3ms3. A variable number of recessive alleles were hypothesized to be present in the MF lines, with some being heterozygous.
The apetalous and male sterile characters are very likely pleiotropic.
Understanding the genetic control of the male sterile character and identification of the presence of recessive alleles in potential pollen parent is of vital importance in the efficient production of uniformly fertile F1 hybrids.
Four apetalous male sterile lines.
MS1 – MS4 and 3 fertile, petaled lines, MF1 – MF3 were selected and crossed.
Select F2, BC-MS (backcross to the male sterile) and BC-MF (backcross to fertile parent) generations from the 12 MS x MF cross combinations were evaluated for their MS:MF segregation.
All MS:MF ratios were evaluated by X2. MS:MF ratios of 1:63, 1:15 and 1:3 and mixed model ratios were observed in the F2 generations.
All BC-MF crosses resulted in 100% fertile, normal petaled plants.
A 3 gene recessive model has been presented as an explanation for the male sterile results obtained.
In this model the male sterile genotype is ms1ms1ms2ms2ms3ms3. A variable number of recessive alleles were hypothesized to be present in the MF lines, with some being heterozygous.
The apetalous and male sterile characters are very likely pleiotropic.
Understanding the genetic control of the male sterile character and identification of the presence of recessive alleles in potential pollen parent is of vital importance in the efficient production of uniformly fertile F1 hybrids.
Publication
Authors
R.K.D. Cowen, L.C. Ewart
Keywords
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