Sex determination in plants
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Transcript of Sex determination in plants
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Upendar Rao GollaDepartment of Biological Sciences
IISER Bhopal
DETERMINATION IN
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Bryophytes
Tracheophytes
Introduction to Plant Kingdom
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Sex determination in Bryophytes
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Sex determination in Bryophytes
Homosporous Ferns
The Plant Cell, Vol. 16, S61–S71
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Sex determination in Angiosperms
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1) Active-Y System of Sex Determination
Ex: Cannabis, Humulus, Silene, Asparagus – XY sex chromosomes
2) X-to-Autosome Balance System of Sex Determination
Rumex Acetosa: X-to-autosome ratio (≥1= females, ≤0.5= males)
3) Hormonal regulation of Sexuality
Mercurialis annua- three independent segregating genes-A1, B1,
B2.
Dominant B1-b2 genes influence the degree of “maleness”4) Evolution of Sexual Dimorphisms in Plants
Mutation causing male or female sterility. Ex: Asparagus
Despite all the above mechanisms in plants may have common origin- Selective pressure for increased genetic fitness
Sex determination in Angiosperms
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Genotype Fenotipe
M_F_M_ffmmF_mmff
GinoeciousMonoeciousHermaproditeAndromonoecious
Genotipe Fenotipe
A_G_A_ggaaG_aagg
MonoeciousGinomonoeciousAndromonoeciousHermaprodite
Appearance on cucumber sex
Appearance on melon sex
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Preserve plant life
THANK YOU