Photosynthesis in Coffea arabica, 2: Effects of water stress
Experiments were carried out to relate soil moisture to leaf water potential ( 1), and to determine the effects of varying 1 on leaf conductances and photosynthesis in coffee. Stomatal conductance was maximum at 0900 h, but plants growing in drier soil showed marked mid-day stomatal closure. After 1500 h, stomata began closing although plant water status improved. Photosynthesis in relation to changing 1 appeared to exhibit roughly three different rates. At the fixed experimental temperature (25ðC) low 1 reduced photosynthesis through its influence on stomata, but under field conditions low 1 and a accompanying rise in temperature could lower the rate by lowering both mesophyll and stomatal conductances
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| Main Authors: | , |
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| Format: | biblioteca |
| Published: |
Ene
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| Subjects: | COFFEA ARABICA, FISIOLOGIA, BIOQUIMICA, FOTOSINTESIS, TRANSLOCACION, SUELO, CONTENIDO DE HUMEDAD, HOJAS, SISTEMA VASCULAR DE LA PLANTA, AGUA, STRESS, AGUA EN LAS PLANTAS, |
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