. As light bounces off these structures within an iridoplast,
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Those structured chloroplasts also offer a survival benefit, the new research shows: They help the plants collect light. In a hybrid of two species — Begonia grandis and Begonia pavonina?—?the structures enhance the absorption of green and red wavelengths by concentrating these rays on light-absorbing compartments within the iridoplasts. Importantly,
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, the structures slow the light. The “group velocity,
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,” or the speed of a packet of light waves,
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, is decreased due to interference between incoming and reflected light. The slowdown gives the plant more time to absorb precious sunbeams.
“These iridoplasts can basically photosynthesize at low-light levels where normal chloroplasts just simply could not photosynthesize,” says study coauthor Heather Whitney,
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, a plant biologist at the University of Bristol in England. Iridoplasts,
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, however, can’t hold their own in bright light. So begonias also have standard chloroplasts, which provide

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