Acta Horticulturae Sinica ›› 2022, Vol. 49 ›› Issue (4): 709-722.doi: 10.16420/j.issn.0513-353x.2020-1051

• Research Papers •     Next Articles

Simulation Analysis of Effects of Shoot Type Composition on Canopy Light Interception Efficiency and Photosynthetic Productivity in Apple Trees

ZHANG Xiaoyun1, TANG Yuwei1, WANG Kai1, ZHANG Dong2,*(), YANG Weiwei1,*()   

  1. 1. The Key Laboratory of Special Fruits and Vegetables Cultivation Physiology and Germplasm Resources Utilization in Xinjiang Production and Construction Group,College of Agriculture,Shihezi University,Shihezi,Xinjiang 832000,China
    2. The Yangling Subsidiary Center Project of the National Apple Improvement Center,College of Horticulture,Northwest A & F University,Yangling,Shaanxi 712100,China
  • Received:2021-11-05 Revised:2022-01-29 Online:2022-04-25 Published:2022-04-24
  • Contact: ZHANG Dong,YANG Weiwei;


This research was conducted to study the effects of shoot types and their relative fractions on canopy light interception and photosynthetic capacities in both short-shoot-type‘Liquan Fuji’and long-shoot-type‘Regal Gala’apple trees. Three-dimensional(3D)virtual shoots for all shoot types and 3D virtual canopies for each cultivar were reconstructed by combining 3D digitizing and shoot- and leaf-scale allometric relationships. The RATP functional-structural plant model was used to estimate canopy photosynthetic productivity. The effects of relative fraction of bourse shoots and vegetative shoots on canopy light interception and photosynthetic productivity were investigated by in silico virtual experiments. The results showed that the reconstructed 3D virtual shoots had similar shoot leaf number and shoot leaf area compared to observed shoots in field,but the light interception efficiency was underestimated. The two-parameter Beta function was able to accurately describe the leaf inclination distribution for all shoot types. The leaf inclination of bourse leaves belonged to plagiophile and the leaves of other shoot types belonged to planophile. The higher internode length and leaf inclination angle for leaves of bourse and bourse shoots led to 8%-14% higher light interception efficiency compared to vegetative shoots. The ‘Liquan Fuji’had higher leaf dispersion than that of‘Regal Gala’,but with similar light interception efficiency. The canopy net photosynthetic rate and daily photosynthesis in‘Regal Gala’were higher than that of‘Liquan Fuji’regardless of under sunny or cloudy climate conditions. An increase in the fraction of bourse shoot increased the canopy light interception efficiency for both cultivars,and increased the canopy net photosynthetic rate and the total photosynthesis for‘Liquan Fuji’,exclusively under cloudy conditions. In summary,at the shoot scale,the leafy shoots developed from the flower buds have a significantly higher light interception than those developed from vegetative buds. At the canopy scale,increase in flower bud density could improve the canopy light interception efficiency and especially improve the photosynthetic productivity for short-shoot-type apple cultivar under cloudy conditions.

Key words: Malus × domestica, 3D digitizing, leaf inclination, tall spindle training, bourse shoot, 3D virtual plant

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