Effect of humidity and wind on leaf conductance of field grown cassava
Material type: ArticleLanguage: English Description: 2(2):17-22Subject(s):- Manihot esculenta
- LEAF CONDUCTANCE
- Stomata
- LEAF WATER POTENTIAL
- WIND
- Relative humidity
- Soil water
- Leaves
- WATER CONTENT
- Colombia
- COMPOSITION
- Plant anatomy
- South America
- Starch crops
- Manihot esculenta
- CONDUCTANCIA FOLIAR
- Estomas
- POTENCIAL HIDRICO FOLIAR
- Viento
- Humedad relativa
- Agua del suelo
- Hojas
- Contenido de agua
- Colombia
- RJ
- CIAT Autor
- Cassava
- Yuca
- Articles in Refereed Journals
- 38572
Item type | Current library | Collection | Call number | Copy number | Status | Date due | Barcode | Item holds | |
---|---|---|---|---|---|---|---|---|---|
Journal Article | CIAT Library Document collection CINFOS | Document Collection CINFOS | 38572 (Browse shelf(Opens below)) | c.1 | Short Loan | 100060979 |
En informes anteriores se indica que los estomas de la yuca se cierran cuando existen grandes diferencias en DPV hoja-aire en condiciones controladas de lab. Mediciones realizadas en el campo con plantas jovenes de yuca cultivadas en suelo humedo en el nordeste de Colombia mostraron que la conductancia foliar disminuye rapidamente (de 6.7 mm/seg a 1.4 KPa a finales de la manana a 1.8 mm/seg a 2.5 KPa a mediodia) con valores crecientes de DPV. La transpiracion tambien disminuyo en el mismo rango de DPV sin cambios en el potencial hidrico foliar total. Las hojas expuestas al viento cerraron sus estomas a mediodia; la conductancia foliar fue de 0.64 mm/seg para hojas en direccion contraria al viento en comparacion con 3.34 mm/seg para hojas en direccion del viento). Se discuten estas respuestas en vista de posibles mecanismos de reaccion estomatica directa a cambios en la humedad atmosferica y sus implicaciones para la productividad de la yuca en los tropicos. (RA-CIAT)
Stomata of cassava (Manihot esculenta Crantz) were previously reported to close in large leaf-air vapor pressure difference (VPD) under laboratory controlled studies. Field measurements made with young cassava plants grown in wet soil in the north-east of Colombia demonstrated that leaf conductance decreased rapidly (from 6.7 mm s(-1) at 1.4 KPa in late morning to 1.8 mm s(-1) at 2.5 KPa at midday) with increasing VPD. Transpiration was also found to decrease over the same range of VPD without change in bulk leaf water potential. Leaves exposed to blowing wind closed their stomata at midday (leaf conductance was 0.64 mm s(-1) for upwind leaves as compared with 3.34 mm s(-1) for downwind leaves). These responses were discussed in light of possible mechanisms of direct stomatal reaction to changes in atmospheric humidity and its implications for cassava productivity in the tropics. (AS)