Scientia Agricultura Sinica ›› 2017, Vol. 50 ›› Issue (9): 1734-1746.doi: 10.3864/j.issn.0578-1752.2017.09.019

• RESEARCH NOTES • Previous Articles    

Effect of Plant Canopy Transformation on Chlorophyll Fluorescence Characteristics and Fruit Yield and Quality in Closed Citrus Orchard

HU DeYu1,2, LIU XueFeng3, HE ShaoLan2, XIE RangJin2, QIAN Chun1, Lü Qiang2, YI ShiLai2, ZHENG YongQiang2, DENG Lie2   

  1. 1College of Horticulture and Landscape Architecture, southwest university, Chongqing 400715; 2Citrus Research Institute, Southwest University/Chinese Academy of Agricultural Sciences, Chongqing 400712; 3Chongqing Three Gorges agricultural  science academy, Chongqing 404155
  • Received:2016-09-18 Online:2017-05-01 Published:2017-05-01

Abstract: 【Objective】The effect of canopy modification on tree canopy characteristics, photosynthesis, nutrition metabolism, fruit production and quality was investigated in closed citrus orchard, with the aim to lay a foundation for tree shape modification, orchard management, agronomic trait supporting for aviation technology and so on.【Method】‘Olinda valencia’ orange of 15 years old was used in this study, which was grafted on ‘Carrizo’ Citrange (C. sinensis×P. trifoliata). The selected trees were modified to open center, hedgerow and trunk shapes, respectively, and those without any modification served as the control (CK). With them, the variation of tree canopy characteristics, leaf nutrition, chlorophyll fluorescence, fruit quality and yield per tree was evaluated.【Result】From June to September after modification, the leaf area index and mean leaf inclination were both increased in all shapes, most remarkably in open center shape, while the transmit coefficient for defuse penetration, transmit coefficient for radiation penetration as well as photosynthetical active radiation were opposite. The tree canopy characteristics were significantly different among all shapes, of which canopy transmittance was gradually increased in an order of open center shape>trunk shape>hedgerow shape>CK. The leaf fluorescence parameters including Fo, Fm and Do were all decreased in all shapes. During experimental time, the values of Fo and Fm of CK were significantly higher than those in other shapes, especially in open center shape. The RC/CSO, jPo jEo, jRo, yRo, dRo PI abs, PI total and so on were decreased in all shapes and the biggest drops were observed in CK, which obviously higher than that in open center shape. The photosystem activities in leaves, utilization efficiency of solar energy and photosynthetic capacities were all improved by tree shape modification. The contents of N, P, K and Zn in all shapes were decreased, while Ca, S, Fe, Mn and Cu were gradually accumulated. Compared to CK, the contents of N, Ca, S and Fe were higher in other modified shapes. The yield per tree was 101.1, 69.1, 89.11 and 64.65 kg, and the soluble solid content of fruits with 10.66%, 10.62%, 10.31% and 9.94% were observed in open center shape, hedgerow shape, trunk shape and CK, respectively.【Conclusion】In this study, the canopy modification in closed citrus orchard significantly improved canopy light condition, photosynthetic capacity and N content in leaves, which led to an increase in yield per tree as well as improvement of fruit quality. Of these shapes, the open center shape was better than other shape.

Key words: closed citrus orchard, canopy characteristics, chlorophyll fluorescence, mineral elements, yield per tree, fruit quality

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