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Photosynthetica

, Volume 54, Issue 4, pp 542–550 | Cite as

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

  • K. Jutamanee
  • S. Onnom
Original papers

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.

Additional key words

chlorophyll fluorescence excessive irradiation net photosynthetic rate photoinhibition 

Abbreviations

b*

yellowness

Chl

chlorophyll

ETR

electron transport rate

Fv/Fm

maximal quantum yield of PSII

gs

stomatal conductance

L*

brightness

NPQ

nonphotochemical quenching

PN

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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Copyright information

© The Institute of Experimental Botany 2016

Authors and Affiliations

  1. 1.Department of Botany, Faculty of ScienceKasetsart UniversityBangkokThailand
  2. 2.Better Pharma Co., Ltd.Vibhavadi Rangsit RdLaksi, BangkokThailand

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