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Genetic differences in fruit-set patterns are determined by differences in fruit sink strength and a source : sink
1Horticultural Supply Chains, Department Plant Sciences, Wageningen University, PO Box 630, 6700 AP Wageningen, The Netherlands. Maaike.Wubs@wur.nl
Annals of Botany
|August 1, 2009
Summary
Fruit set patterns in peppers are influenced by fruit sink strength and the source:sink ratio. Differences in these factors explain variations in fruit set among cultivars, impacting overall yield.
Area of Science:
- Plant Physiology
- Horticultural Science
- Crop Science
Background:
- Fruit set in indeterminate plants relies on the balance between resource supply (source strength) and demand (sink strength).
- Cultivar-specific differences in fruit set patterns are observed throughout the growing season.
Purpose of the Study:
- To investigate if variations in fruit sink strength among pepper cultivars explain observed differences in fruit-set patterns.
- To determine the relationship between fruit sink strength, source:sink ratio, and fruit set.
Main Methods:
- Greenhouse experiment evaluating six pepper cultivars with varying fruit set and growth characteristics.
- Quantification of fruit-set patterns, generative and vegetative sink strengths, source strength, and source:sink ratio.
- Utilized a simulation model to analyze the impact of these parameters on fruit-set patterns.
Main Results:
- Individual fruit sink strengths varied significantly among cultivars.
- Large-fruited cultivars exhibited fluctuating fruit set linked to total fruit sink strength, while small-fruited cultivars showed consistent fruit set.
- Higher source:sink thresholds for fruit set were observed in large-fruited cultivars.
Conclusions:
- Both individual fruit sink strength and the source:sink threshold are critical for explaining cultivar-specific fruit-set patterns.
- These factors significantly influence average fruit set percentage and weekly variation in fruit set.
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