Polarity is defined as the condition of having distinct poles in a pollen grain. Jackson in 1928 assumed that a pollen grain points to the poles like Silphium. Silphium laciniatum, also known as compass plant, has leaves that ‘turn their edges north and south and avoid the mid-day radiation’ —Willis. Pollen mother cell after meiosis […]
Polarity of a Pollen Grain | Plants
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Shape of a Pollen Grain | Plants
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Sporoderm defines the shape of a pollen grain and spore. Erdtman (1952) distinguishes nine common types of shape (Fig. 4.33). The shape classes are based on the ratio between the length of polar axis (P) and equatorial diameter (E). P and E are measured from the equatorial view of a pollen grain and spore. Measurements […]
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