Flower pollen

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  • Summer should be the time when we all enjoy the great outdoors, but for around one in

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  • 7.1 Pollination and fruit set Flowering habit Without flowers there will be no fruit. Only pistillate (= female) flowers set fruit. Staminate (= male) flowers produce the pollen needed to pollinate pistillate flowers. Perfect (= hermaphrodite) flowers have both pistils and stamens. Figure 17 shows the parts of a perfect flower.

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  • The history of an invention, whether of science or art, may be compared to the growth of an organism such as a tree. The wind, or the random visit of a bee, unites the pollen in the flower, the green fruit forms and ripens to the perfect seed, which, on being planted in congenial soil, takes root and flourishes. Even so from the chance combination of two facts in the human mind, a crude idea springs, and after maturing into a feasible plan is put in practice under favourable conditions, and so develops. These processes are both subject to a thousand accidents which are inimical...

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  • More than half of flowering plants have a sophisticated mechanism for self-pollen rejection, named self-incompatibility. In the Brassicaceae family, the recognition specificity of a self-incompatibility system is achieved by the interaction of the stigmatic S-receptor kinase and its ligand S-locus cys-teine-rich protein, which are encoded by two tightly linked polymorphic genes.

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