34 Genetics of Flower Development II

34 Genetics of Flower Development II - Genetics of Flower...

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Unformatted text preview: Genetics of Flower Development Lecture: 34 BioSci 1C May.31.07 Genes and Flower Development 1- Genes are expressed in 2 whorls 2- combination of genes determine organ identity 3- A and C genes are mutually antagonistic Flower Evocation The event occurring in the shoot apex that commit the apical meristems to produce flowers Phases from juvenile to flowering plant Shoot Apical Meristem (SAM) generates different organs at different developmental stages A: Early development it forms rosette leaves B: Transition to flowering when SAM is transformed into primary inflorescence meristem which ultimately produces flowers. SAM generates different organs at different developmental stages Transition form vegetative to reproductive phase is marked by an increase in the frequency of cell divisions within the central zone of the SAM. Flower Evocation Signals that leads to flower evocation: 1- Internal factors 2- External factors Flower Evocation 1- Internal factors: Circadian rhythm Phase change Hormones 2- External factors: Day Length (Photoperiod) Temperature (vernalization) Regulations of Flower Evocation 1- Autonomous regulation When flowering is solely controlled by internal factors and DOES NOT depend on environmental conditions....
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34 Genetics of Flower Development II - Genetics of Flower...

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