Atmospheric CO 2 has been predicted to double by the year 2100. Elevated CO 2 causes an increase in photosynthetic rate and extra assimilate is allocated to plant growth, seed and fruit pro- duction. Increased investment in flowers may have implications for pollination in entomophilous plants. Floral nectar standing crop, flower production and longevity were examined in Vicia faba, field bean, at ambient and elevated CO 2 . Nectar standing crop did not differ significantly between treat- ments but plants grown at elevated CO 2 produced approximately 25% more flowers per plant and these lived 17% longer than those grown at ambient CO 2 . A plant grown at elevated CO 2 may thus pro- duce more nectar in total and, together with its increased floral display, may be more attractive to pol- linators, but pollen flow will not necessarily be improved.
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