Mechanism involves weakening of the cell walls of the surrounding seed tissues,
especially at the micropylar region
Pectin methylesterase (PME) is a cell wall hydrolase involved in mediating
weakening of the cell walls of the megagametophyte of yellow-cedar
Acidic environment (due to IAA (auxin)) of cell wall ph7 activates Expansin which loosens cell wall by breaking down hemicellulose
In Arabidopsis:
Efflux carriers
PIN gene-family of eight
Influx carriers
AUX gene-family of four
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