1990
DOI: 10.1139/b90-059
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Fonctionnement des stomates de Cocotier (Cocos nucifera) au champ

Abstract: The behavior of coconut (Cocos nucifera L.) stomata was studied under field conditions in adult plants. Hourly determination of relative stomatal opening and of stomatal conductance values revealed that coconut stomata were opened maximally between 0800 and 1600; by the end of this period, the stomata closed rapidly as solar radiation decreased. Changes in temperature and relative humidity of the air did not affect stomatal behavior. The maximum relative stomatal opening occurred at midday, when the water pote… Show more

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Cited by 9 publications
(11 citation statements)
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“…Using both a diffusion porometer and the infiltration technique, diurnal changes in stomatal opening were also monitored in Brazil (Passos and Da Silva, 1990). Both methods showed the stomata (leaf 14, mature palm, Géant de Brésil) to be wide open during the middle of the day (from 08:00 hours to 16:00 hours) before closing rapidly as solar radiation levels declined.…”
Section: Rootsmentioning
confidence: 99%
“…Using both a diffusion porometer and the infiltration technique, diurnal changes in stomatal opening were also monitored in Brazil (Passos and Da Silva, 1990). Both methods showed the stomata (leaf 14, mature palm, Géant de Brésil) to be wide open during the middle of the day (from 08:00 hours to 16:00 hours) before closing rapidly as solar radiation levels declined.…”
Section: Rootsmentioning
confidence: 99%
“…Compared to the tall varieties, some evidence suggests that dwarf varieties use water more extravagantly due to its elevated transpiration rate (IRHO-CIRAD 1992 ) , greater number of stomata per unit leaf area (stomatal frequency), and lower wax content on the leaf surface (Rajagopal et al 1990 ) , as well as a poorer stomatal control of water loss (Passos and Silva 1990 ) . Tall varieties, in contrast, show a more conservative water use (Voleti et al 1993 ) .…”
Section: Response To Soil Moisturementioning
confidence: 99%
“…A homogeneidade do solo em questão, e os sinais de que o sistema radicular reage com a produção de novas raízes em profundidade, durante o período seco, leva a crer que o suprimento de água é regido, principalmente, pelo grau de exploração do sistema radicular e pelo gradiente de umidade e movimento de água criados pelas raízes (Passos, 1997). Da mesma forma, a constatação de que o coqueiro não promove regulação efetiva das perdas de água em condições de déficit hídrico (Passos & Silva, 1990) permite a suposição de que o sistema radicular pode atuar como um dos mecanismos de adaptação do coqueiro para manter o suprimento regular de água.…”
Section: O Sistema Radicularunclassified
“…As trocas gasosas com o ambiente e a transpiração ocorrem através dos estômatos, localizados na face inferior dos folíolos do coqueiro. Os estômatos abrem-se durante as horas de maior intensidade luminosa, fechando-se ao entardecer, permanecendo assim durante toda a noite (Passos & Silva, 1990). Quanto mais abertos estiverem os estômatos, maior será a transpiração, absorvendo assim mais água e nutrientes, aumentando também a entrada de gás carbônico e a atividade fotossintética (Passos, 1997).…”
Section: Folhaunclassified
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