Pollination

4.2.1 Pollen-stigma recognition and interaction The landing of pollen on a compatible stigma marks the beginning of pollination. The pollen will then adhere, hydrate and germinate to produce the pollen tube, a structure specialized in the delivery of the sperm cells to the ovule Fig. 4.1 . Stigmas can be divided into two broad types, wet and dry, depending on the amount of exudate present Heslop-Harrison and Shivanna, 1977 . It has been suggested that in plants with dry stigmas e.g. crucifers ,...