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Improving photosynthetic performance and some fruit quality traits in mango trees by shading

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Photosynthetica

Abstract

Excess solar radiation under hot climate can lead to decline in photosynthetic activity with detrimental effects on growth and yield. The aim of this study was to evaluate the use of a transparent plastic roof as shading for diurnal changes in photosynthetic gas exchange, chlorophyll fluorescence, fruit set and quality of mango (Mangifera indica L.) cv. ‘Nam Dok Mai’ growth in the field conditions. Fully expanded leaves were examined either shaded by the plastic roof or sunlit under natural conditions. Leaf temperature and leaf-to-air vapour pressure deficit of the shaded leaves measured on the clear day were lowered compared to those of the sunlit leaves. It resulted in increased stomatal conductance and photosynthetic rates of the shaded leaves compared to those of the sunlit leaves, especially from the morning to midday. Furthermore, the reversible decrease of the maximal quantum yield of PSII was more pronounced in the sunlit leaves than that in the shaded ones. Shading increased the total fruit number; the shaded fruits developed better external color than that of the sun-exposed fruits. Our results indicated that shading could maintain the high photosynthetic activity by reducing stomatal limitations for carbon supply and was effective in alleviating the photoinhibitory damage to PSII during bright and clear days with excessive radiation. Finally, shading could increase the number of fruits and improve mango peel color.

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Abbreviations

b*:

yellowness

Chl:

chlorophyll

ETR:

electron transport rate

Fv/Fm :

maximal quantum yield of PSII

g s :

stomatal conductance

L*:

brightness

NPQ:

nonphotochemical quenching

P N :

net photosynthetic rate

qp:

photochemical quenching coefficient

RH:

relative humidity

Tair :

air temperature

Tleaf :

leaf temperature

TA:

titratable acidity

TSS:

total soluble solid

VPDair :

air vapour pressure deficit

VPDleaf-air :

leaf-to-air vapour pressure deficit

WUEi :

intrinsic water-use efficiency

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Authors and Affiliations

  1. Department of Botany, Faculty of Science, Kasetsart University, Bangkok, 10900, Thailand

    K. Jutamanee

  2. Better Pharma Co., Ltd., Vibhavadi Rangsit Rd, Laksi, Bangkok, 10210, Thailand

    S. Onnom

Authors
  1. K. Jutamanee
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  2. S. Onnom
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Corresponding author

Correspondence to K. Jutamanee.

Additional information

Acknowledgements: The present work was supported by Kasetsart University, Thailand. We also would like to thank Prof. Dr. Suntaree Yingjajaval from Kasetsart University for allowing the use of photosynthesis instruments and Prof. Dr. Ian Bennett at Edith Cowan University, Australia for criticism of the manuscript.

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Jutamanee, K., Onnom, S. Improving photosynthetic performance and some fruit quality traits in mango trees by shading. Photosynthetica 54, 542–550 (2016). https://doi.org/10.1007/s11099-016-0210-1

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  • DOI: https://doi.org/10.1007/s11099-016-0210-1

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