Leaf Development

Question 1

Leaf identity

Answer 1

Turn off meristem genes and turn on leaf genes.

Knox1, arp and boundary genes are McKee transcriptional regulators that control expression of other genes

Precise control of cell fate involves tight control of transcription by developmentally regulated activator and repressors.

Question 2

Leaf polarity

Answer 2

Dorsal/ adaxial- light harvesting

Ventral/ abaxial- transpirational water loss, respiratory gas exchange.

Question 3

Establishment of leaf polarity

Answer 3

Central leaf primordial adaxial and abaxial more peripheral to shoot apical meristem

Signal from meristem moves through epidermis and conveys adaxial position info
PHB promotes adaxial identity as well as REV and PHV

Question 4

Loss of adaxial or abaxial fate

Answer 4

Causes radial leaves to form

Question 5

PHB

Answer 5

Regulated my miRNA and associated with AGO1

Program

Question 6

Why is leaf polarity important for agriculture.

Answer 6

Affects water loss and stress under low water conditions