Photosynthesis of cassava (Manihot esculenta)
In recent studies of cassava at CIAT, net CO2 uptake rates of 20 to 35 ?mol CO2 m?2 s?1 were commonly observed. Cassava photosynthesis has a high optimum temperature (35°C) and a wide plateau (25 to 35°C) corresponding to the temperature range under which cassava is cultivated. Leaf photosynthesis r...
| Main Authors: | , |
|---|---|
| Format: | Journal Article |
| Language: | Inglés |
| Published: |
Cambridge University Press
1990
|
| Subjects: | |
| Online Access: | https://hdl.handle.net/10568/43951 |
| _version_ | 1855515461610897408 |
|---|---|
| author | El-Sharkawy, Mabrouk A. Cock, James H. |
| author_browse | Cock, James H. El-Sharkawy, Mabrouk A. |
| author_facet | El-Sharkawy, Mabrouk A. Cock, James H. |
| author_sort | El-Sharkawy, Mabrouk A. |
| collection | Repository of Agricultural Research Outputs (CGSpace) |
| description | In recent studies of cassava at CIAT, net CO2 uptake rates of 20 to 35 ?mol CO2 m?2 s?1 were commonly observed. Cassava photosynthesis has a high optimum temperature (35°C) and a wide plateau (25 to 35°C) corresponding to the temperature range under which cassava is cultivated. Leaf photosynthesis requires high saturation irradiance (1500 ?mol m?2 s?1) and the rates are greatly reduced by leaf-air vapour pressure differences above 1.5 kPa; this reduction is associated with stomatal closure. Cassava leaves have low photorespiration, low CO2 compensation point, high percentage of carbon fixation in C4 acids and a high PEP-carboxylase activity (15 35% of that in maize), but cassava does not have the typical C4-Kranz anatomy. Field measurements of single leaf photosynthesis among a wide range of cultivars grown under rain-fed conditions showed that when light interception was not limiting, there were significant correlations between leaf photosynthesis, total biomass and root yield. This suggests that the use of parental materials with high photosynthetic capacity, in combination with other yield determinants, could be a successful strategy for developing high yielding cultivars. This might be done by exploiting any genetical variations in leaf anatomy and biochemistry that could enhance photosynthesis efficiency and hence productivity. |
| format | Journal Article |
| id | CGSpace43951 |
| institution | CGIAR Consortium |
| language | Inglés |
| publishDate | 1990 |
| publishDateRange | 1990 |
| publishDateSort | 1990 |
| publisher | Cambridge University Press |
| publisherStr | Cambridge University Press |
| record_format | dspace |
| spelling | CGSpace439512024-11-15T08:52:08Z Photosynthesis of cassava (Manihot esculenta) El-Sharkawy, Mabrouk A. Cock, James H. manihot esculenta photosynthesis air temperature light requirements carbon biochemical pathways leaves fotosíntesis temperatura del aire necesidades de luz carbono vía bioquímica del metabolismo hojas In recent studies of cassava at CIAT, net CO2 uptake rates of 20 to 35 ?mol CO2 m?2 s?1 were commonly observed. Cassava photosynthesis has a high optimum temperature (35°C) and a wide plateau (25 to 35°C) corresponding to the temperature range under which cassava is cultivated. Leaf photosynthesis requires high saturation irradiance (1500 ?mol m?2 s?1) and the rates are greatly reduced by leaf-air vapour pressure differences above 1.5 kPa; this reduction is associated with stomatal closure. Cassava leaves have low photorespiration, low CO2 compensation point, high percentage of carbon fixation in C4 acids and a high PEP-carboxylase activity (15 35% of that in maize), but cassava does not have the typical C4-Kranz anatomy. Field measurements of single leaf photosynthesis among a wide range of cultivars grown under rain-fed conditions showed that when light interception was not limiting, there were significant correlations between leaf photosynthesis, total biomass and root yield. This suggests that the use of parental materials with high photosynthetic capacity, in combination with other yield determinants, could be a successful strategy for developing high yielding cultivars. This might be done by exploiting any genetical variations in leaf anatomy and biochemistry that could enhance photosynthesis efficiency and hence productivity. 1990-07 2014-10-02T08:33:00Z 2014-10-02T08:33:00Z Journal Article https://hdl.handle.net/10568/43951 en Limited Access Cambridge University Press |
| spellingShingle | manihot esculenta photosynthesis air temperature light requirements carbon biochemical pathways leaves fotosíntesis temperatura del aire necesidades de luz carbono vía bioquímica del metabolismo hojas El-Sharkawy, Mabrouk A. Cock, James H. Photosynthesis of cassava (Manihot esculenta) |
| title | Photosynthesis of cassava (Manihot esculenta) |
| title_full | Photosynthesis of cassava (Manihot esculenta) |
| title_fullStr | Photosynthesis of cassava (Manihot esculenta) |
| title_full_unstemmed | Photosynthesis of cassava (Manihot esculenta) |
| title_short | Photosynthesis of cassava (Manihot esculenta) |
| title_sort | photosynthesis of cassava manihot esculenta |
| topic | manihot esculenta photosynthesis air temperature light requirements carbon biochemical pathways leaves fotosíntesis temperatura del aire necesidades de luz carbono vía bioquímica del metabolismo hojas |
| url | https://hdl.handle.net/10568/43951 |
| work_keys_str_mv | AT elsharkawymabrouka photosynthesisofcassavamanihotesculenta AT cockjamesh photosynthesisofcassavamanihotesculenta |