Barley flowers sense light early, hidden inside the stem
Babanna ST, Huang Y, Weber APM, Schnurbusch T
Plant Signaling
The barley in your beer or morning cereal owes some of its grain count to a hidden light-sensing step happening inside the plant's stem long before the seed head ever pokes into view.
Long before a barley spike breaks out into open air, it's already green and photosynthesizing while still wrapped up inside the leaf sheath. Scientists found that this early greening isn't just decoration: when they blocked light from reaching the hidden spike, more of the developing florets died and pollen quality dropped, especially near the tip. Plants that greened up more while still concealed ended up keeping more of their flowers alive, suggesting this quiet light-sensing habit helps barley set more grain.
Key Findings
Pre-anthesis inflorescence greening (PAIG) begins while spikes are still enclosed in leaf sheaths, starting in the central rachis before spreading to spikelet primordia and floral organs.
A non-destructive dark treatment blocking light to developing inflorescences did not affect floral initiation but significantly reduced floral survival and pollen viability, particularly at the spike tip.
Natural variation studies revealed a strong positive correlation between the extent of PAIG and floral survival across barley plants.
chevron_right Technical Summary
Barley plants start turning their future flower spikes green with light while they're still hidden inside the leaf sheath, weeks before the spike emerges. Blocking that light doesn't stop flowers from forming, but it kills off more of them and reduces pollen viability, especially at the spike's tip, which could mean lower grain yields.
Abstract Preview
Original paper
Pre-anthesis light signaling of sheathed developing barley inflorescences defines floral fate.
Pre-anthesis inflorescence greening (PAIG) is a distinctive developmental feature in members of the Triticeae such as barley, wheat, and rye. In barley (Hordeum vulgare L.), floral survival and fer...
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