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Light and nitrogen nutrition regulate apical control in Rosa hybrida L
Pierre-Maxime Furet1, Jérémy Lothier1, Sabine Demotes-Mainard2
1Université d'Angers, UMR 1345 Institut de Recherche en Horticulture et Semences (Université d'Angers, Agrocampus-Ouest, INRA), SFR 4207 QUASAV, PRES L'UNAM, 2 Bd Lavoisier, F-49045 Angers, France.
Journal of Plant Physiology
|February 4, 2014
Summary
Environmental factors like light and nitrate influence apical control in roses. High light and nitrogen allow all buds to grow, while other conditions restrict bud development, impacting plant architecture.
Area of Science:
- Plant biology
- Horticulture
- Physiology
Background:
- Apical control, the inhibition of lower bud growth by upper buds, is poorly understood.
- It differs from apical dominance and is regulated by environmental factors.
Purpose of the Study:
- To investigate the roles of light intensity and nitrate nutrition in regulating apical control in decapitated rose plants (Rosa hybrida).
- To understand how these factors influence bud break and axillary bud elongation.
Main Methods:
- Decapitation of rose bushes to remove apical hormonal influence.
- Manipulation of light intensity (low and high) and nitrate levels (low and high).
- Observation of bud outgrowth and elongation along the main stem.
Main Results:
- Apical control occurred in low light, irrespective of nitrate levels.
- In high light, apical control was observed only under low nitrate conditions; high nitrate and high light allowed all buds to grow.
- Photosynthetic activity, sugar content, and sucrose transporter expression (RhSUC2) were higher under high light.
Conclusions:
- Light intensity and nitrogen availability are key factors in establishing apical control.
- These factors influence bud outgrowth by affecting photosynthesis, sugar transport, and nutrient availability.
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