Integrated physiological and transcriptomic measurements reveal changes in the accumulation and partitioning of storage reserves after prevention of pollination in maize.
Tian L, Li P, Liu Y, Liu S, Zhang J, Xu M, Xu S, Li M, Zhang Z, Dong W, Mu J, Liu X, Chen Y, Ku L, Wu L.
Crop Improvement
Corn ears that fail to pollinate — a common sight after a cold snap, drought, or missed planting window — don't just sit empty; they actively accelerate the whole plant's decline, and knowing exactly which genes flip that switch gives breeders a target for building crops that hold on longer under bad conditions.
When corn plants don't get pollinated, the plant essentially panics and starts aging rapidly, diverting resources away from grain formation. Researchers tracked exactly when and how this breakdown happens, finding that a critical tipping point occurs roughly two to three weeks after the silk emerges. They pinpointed 20 master-switch genes — including some that manage stress responses — that appear to drive this early aging cascade.
Key Findings
Pollination prevention triggered early senescence, with the sharpest divergence in gene activity occurring between 14 and 18 days after silking — a narrow window that marks the onset of stress-induced aging.
Five coordinated gene networks linked to energy metabolism, photosynthesis, and stress responses were disrupted in non-pollinated grains, correlating with measurable changes in sugar levels and oxidative stress markers.
20 hub genes — including MYB transcription factors and heat shock protein genes — were identified as likely master regulators of senescence triggered by reduced grain demand.
chevron_right Technical Summary
Scientists discovered that when corn plants cannot pollinate, they age and deteriorate much faster than normal — and identified 20 specific genes that appear to control this premature aging process. Understanding these genetic switches could help develop corn varieties that better withstand stress during grain development.
Abstract Preview
<h4>Background</h4>Reduced sink demand, such as that caused by grain or ear removal, is known to accelerate senescence in maize; nonetheless, how diminished sink strength mechanistically triggers s...
open_in_new Read full abstractAbstract copyright held by the original publisher.
Was this useful?
Want to tell us more? (optional)
Thanks for the note!
Something went wrong — please try again.
Too many submissions. Try again in an hour.
Chloroplast Genome Editing Eliminates Gluten Immunogenicity in Triticum aestivum
It could mean that people with celiac disease — roughly 1 in 100 worldwide — may one day safely eat bread made from real wheat, without sacrificing the taste...
Maize, also known as corn in North American English, is a tall stout grass that produces cereal grain. The leafy stalk of the plant gives rise to male inflorescences or tassels which produce pollen, and female inflorescences called ears. The ears yield grain, known as kernels or seeds. In modern ...