Hybrid vigor induced by cross-breeding enhances canopy photosynthesis and fruit yield of Japanese sweet pepper

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Abstract

The effect of hybrid vigor on the fruit yield in Japanese sweet pepper (Capsicum annuum L.) was investigated by comparing dry matter production, canopy light-intercepting characteristics and canopy photosynthesis of F1 cultivars to those of their parent lines. The greater yields in the F1 cultivars were caused by both higher dry matter partitioning rate into fruits and total dry matter production. There was no difference in the leaf photosynthetic capacity between the F1 cultivars and their parent lines. The canopy photosynthetic rate, total dry matter production, and yield showed significantly positive correlations with the photosynthetic photon flux absorbed within the plant canopy. The hybrid vigor caused higher plant statures with richer foliage, which led to more effective vertical profiles of leaf area, light absorption, and photosynthesis within the respective canopies. These factors caused a sufficiently higher canopy photosynthesis to produce greater dry matter production and maintain a higher dry matter partitioning rate into fruits, which resulted in higher yields. These results suggest that the vertical profiles of light-intercepting characteristics and photosynthesis within the canopies, which are evaluated by agro-meteorological methodology, are effective selection indices for breeding plants with higher yields.

Original languageEnglish
Pages (from-to)29-38
Number of pages10
JournalEnvironmental Control in Biology
Volume57
Issue number2
DOIs
Publication statusPublished - Jan 1 2019

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sweet peppers
heterosis
fruit yield
photosynthesis
canopy
dry matter accumulation
dry matter partitioning
cultivars
fruits
selection index
Capsicum annuum
plant breeding
leaves
leaf area

All Science Journal Classification (ASJC) codes

  • Agronomy and Crop Science
  • Plant Science

Cite this

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title = "Hybrid vigor induced by cross-breeding enhances canopy photosynthesis and fruit yield of Japanese sweet pepper",
abstract = "The effect of hybrid vigor on the fruit yield in Japanese sweet pepper (Capsicum annuum L.) was investigated by comparing dry matter production, canopy light-intercepting characteristics and canopy photosynthesis of F1 cultivars to those of their parent lines. The greater yields in the F1 cultivars were caused by both higher dry matter partitioning rate into fruits and total dry matter production. There was no difference in the leaf photosynthetic capacity between the F1 cultivars and their parent lines. The canopy photosynthetic rate, total dry matter production, and yield showed significantly positive correlations with the photosynthetic photon flux absorbed within the plant canopy. The hybrid vigor caused higher plant statures with richer foliage, which led to more effective vertical profiles of leaf area, light absorption, and photosynthesis within the respective canopies. These factors caused a sufficiently higher canopy photosynthesis to produce greater dry matter production and maintain a higher dry matter partitioning rate into fruits, which resulted in higher yields. These results suggest that the vertical profiles of light-intercepting characteristics and photosynthesis within the canopies, which are evaluated by agro-meteorological methodology, are effective selection indices for breeding plants with higher yields.",
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