2003
DOI: 10.1590/s1413-70542003000400009
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Influência de diferentes níveis de sombreamento no comportamento fisiológico de cultivares de café(Coffea arabica L.)

Abstract: RESUMO - INFLUENCE OF DIFFERENT SHADING LEVELS IN PHYSIOLOGICAL BEHAVIOR OF COFFEE CULTIVARS (Coffea arabica L.)ABSTRACT -The objective of this work was to examine the coffee cultivars Acaiá MG 474/19, Catuaí MG 99, Icatu Amarelo MG 3282 and Rubi MG 1192, in relation to parameters such as water potencial, transpiration, leaf surface temperature, stomatic conductance, photosynthesis, internal carbon concentration and PSII photochemical efficiency when submitted to shading levels of 30, 50 and 70% and full sunli… Show more

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Cited by 16 publications
(14 citation statements)
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References 10 publications
(9 reference statements)
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“…The MM and PM A n levels for GI 45 through GI 100 (Fig. 1e) are in line with results of De Freitas et al (2003). The positive linear relationship observed between the slope (m) of the linear A n versus g s equation in response to GI (Fig.…”
Section: Acclimation Of Leaf Gas Exchange To Sun and Shadesupporting
confidence: 87%
See 1 more Smart Citation
“…The MM and PM A n levels for GI 45 through GI 100 (Fig. 1e) are in line with results of De Freitas et al (2003). The positive linear relationship observed between the slope (m) of the linear A n versus g s equation in response to GI (Fig.…”
Section: Acclimation Of Leaf Gas Exchange To Sun and Shadesupporting
confidence: 87%
“…Limitation of photosynthesis by low light availability has been proposed as one of the main reasons for lower yields of coffee grown in agroforestry systems in optimal coffee production areas such as southeastern Brazil (DaMatta et al 2007) and the Central American highlands (Beer et al 1998). Under suboptimal (hotter and drier) growing conditions, coffee production in full sun is lower than in the shade (De Freitas et al 2003;van Kanten and Vaast 2006) which has been related to the high sensitivity of coffee g s to VPD l (DaMatta and Ramalho 2006;Ronquim et al 2006;Vaast et al 2007). As shade trees reduce wind speed and leaf temperature while increasing air humidity, and hence reducing VPD l and the stomatal limitations of coffee A n , agroforestry systems have been recommended for suboptimal growing conditions (DaMatta 2004;DaMatta et al 2007;Vaast et al 2007).…”
Section: Introductionmentioning
confidence: 99%
“…Devido a fatores como fotoinibição e danos ao fotossistema II, a eficiência fotossintética é reduzida em condições de elevada irradiância, promovendo um incremento da temperatura foliar, com consequências na redução na condutância do mesófilo, o que contribui para prejudicar as trocas gasosas na folha (RAMALHO et al, 1998;NUNES et al, 2003;FREITAS et al, 2003). Desse modo, segundo Villatoro (2004), benefícios relacionados às modificações do microclima causadas pela cobertura arbórea, principalmente no que diz respeito ao controle da irradiação e flutuações extremas de temperatura, são esperados em associações entre o cafeeiro e espécies arbóreas.…”
Section: Introductionunclassified
“…Porém, alguns autores apontam que cafeeiros sob sombra apresentam maiores taxas fotossintéticas, maior crescimento, maior resistência à seca e produções mais constantes ao longo dos anos, uma vez que a redução da radiação pelas árvores e a manutenção do microclima ao longo do ano pode evitar danos por fotoinibição e fotooxidação, reduzindo o efeito da bianualidade sobre a produção (BEER et al, 1997;FAHL et al, 1989;FREITAS et al, 2003;CAMPANHA et al, 2004).…”
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