Stem bending reduces internode elongation and enhances stem diameter in tomato, with potential involvement of jasmonate-gibberellin and jasmonate-abscisic acid signaling.
Bao B, Li W, Ru L, Yan G, Xu Y
Crop Improvement
If you grow tomatoes indoors or in a greenhouse, bending the main stem is a free, no-chemical way to keep plants compact and productive — and now scientists know exactly why it works, opening the door to smarter training techniques.
When you bend a tomato plant's stem, the plant responds by slowing how much its stem cells puff up and expand — not by making fewer cells, but by keeping existing cells smaller. This makes the plant shorter and stockier between each set of leaves. The plant achieves this by shifting its internal chemical signals: it dials down a growth-promoting chemical and cranks up stress-related chemicals that put the brakes on stretching.
Key Findings
Stem bending significantly reduced plant height and internode elongation, with the strongest effect on newly developing internodes
Shorter internodes were caused by restricted expansion of pith parenchyma cells, not a reduction in cell number
Genes involved in gibberellin deactivation and jasmonate biosynthesis/signaling were markedly upregulated in bent internodes
chevron_right Technical Summary
Bending tomato stems in greenhouses — a common grower trick to manage canopy height — physically reshapes how the plant grows: stems get shorter between leaf nodes and wider overall. Researchers found this happens through hormone-level changes that slow cell expansion, not cell division, revealing the biology behind a practice growers have used for years without fully understanding.
Abstract Preview
Stem bending is widely used in greenhouse tomato production to improve canopy structure and light distribution, yet its effects on stem growth and hormonal regulation remain poorly understood. Here...
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