sex determination in plants
DESCRIPTION
This presentation describes different approaches/mechanisms by which the sex of a plant determined.TRANSCRIPT
Upendar Rao GollaDepartment of Biological Sciences
IISER Bhopal
DETERMINATION IN
Bryophytes
Tracheophytes
Introduction to Plant Kingdom
Sex determination in Bryophytes
Sex determination in Bryophytes
Homosporous Ferns
The Plant Cell, Vol. 16, S61–S71
Sex determination in Angiosperms
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
Genotype Fenotipe
M_F_M_ffmmF_mmff
GinoeciousMonoeciousHermaproditeAndromonoecious
Genotipe Fenotipe
A_G_A_ggaaG_aagg
MonoeciousGinomonoeciousAndromonoeciousHermaprodite
Appearance on cucumber sex
Appearance on melon sex
Preserve plant life
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