Cistaceae regeneration associated to fire occurrence is due to the hard coat of seeds that impose physical dormancy6. Seeds with physical dormancy cannot germinate because of palisade cell layer(s) that avoids water intake to the seed7. Seeds remain dormant until some factor(s) make the seed coat permeable to water. Seeds with physical dormancy show specialized structures in the seed coat like the chalazal plug in Cistaceae8. During physical dormancy break, this plug is pushed slightly into the seed and forms a circular opening (oculus) through which the seeds imbibe water9,10. In addition to the unplugging of the seed coat opening, exposure to dry heat also causes cracks in the outer coat layers11,12,13.
Crack Palisade Decision Tools 63 76
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