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Agriculture 2017, 7(10), 85; doi:10.3390/agriculture7100085

Effect of Magnesium on Gas Exchange and Photosynthetic Efficiency of Coffee Plants Grown under Different Light Levels

1
Departamento de Ciência do Solo/DCS, Universidade Federal de Lavras/UFLA, Cx. P. 3037, 37200-000 Lavras-MG, Brazil
2
Empresa de Pesquisa Agropecuária de Minas Gerais/EPAMIG, Cx. P. 176, 37200-000 Lavras-MG, Brazil, paulotgg@epamig.ufla.br
3
Instituto Tecnológico Vale Desenvolvimento Sustentável, 66055-090 Belém-PA, Brazil, furtinineto@gmail.com
4
Empresa de Pesquisa Agropecuária de Minas Gerais/EPAMIG, Cx. P. 176, 37200-000 Lavras-MG, Brazil, herosrezende@yahoo.com.br
5
Campus Professora Cinobelina Elvas, Universidade Federal do Piauí, Rodovia Municipal Bom Jesus Viana, km 1, 64900-000 Bom Jesus-PI, Brazil, julianlacerda@gmail.com
*
Author to whom correspondence should be addressed.
Received: 12 July 2017 / Revised: 14 September 2017 / Accepted: 14 September 2017 / Published: 30 September 2017
(This article belongs to the Special Issue Plant Nutrient Dynamics in Stressful Environments)
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Abstract

The aim of the present study was to investigate the effects of magnesium on the gas exchange and photosynthetic efficiency of Coffee seedlings grown in nutrient solution under different light levels. The experiment was conducted under controlled conditions in growth chambers and nutrient solution at the Department of Plant Pathology of the Federal University of Lavras. The treatments consisted of five different Mg concentrations (0, 48, 96, 192 and 384 mg·L−1) and four light levels (80, 160, 240 and 320 µmol photon m−2·s−1). Both the Mg concentration and light levels affected gas exchange in the coffee plants. Photosynthesis increased linearly with the increasing light, indicating that the light levels tested were low for this crop. The highest CO2 assimilation rate, lowest transpiration, and highest water use efficiency were observed with 250 mg·Mg·L−1, indicating that this concentration was the optimal Mg supply for the tested light levels. View Full-Text
Keywords: coffee plant nutrition; photoinhibition; photoprotection; leaf scald coffee plant nutrition; photoinhibition; photoprotection; leaf scald
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MDPI and ACS Style

Dias, K.G.L.; Guimarães, P.T.G.; Neto, A.E.F.; Silveira, H.R.O.; Lacerda, J.J.J. Effect of Magnesium on Gas Exchange and Photosynthetic Efficiency of Coffee Plants Grown under Different Light Levels. Agriculture 2017, 7, 85.

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