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Cassava is an important energy-rich food for millions of people in tropical developing countries. The crop has reached that status after thousands of years of evolution under diverse agro-ecosystems, movement of germplasm within and across continents, and more recently, through scientific genetic...


Iglesias F., Carlos ArielBonierbale, Merideth W.El-Sharkawy, Mabrouk A.Lozano T., José CarlosBellotti, Anthony C.Wheatley, Christopher C.[Focusing basic research for cassava varietal improvement]Focusing basic research for cassava varietal improvement

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 photosynthesi...


El-Sharkawy, Mabrouk A.Cock, James H.[Photosynthesis of cassava (Manihot esculenta)]Photosynthesis of cassava (Manihot esculenta)

The paper summarizes research conducted at International Center for Tropical Agriculture (CIAT) on responses of cassava to extended water shortages in the field aided by modern gas-exchange and water-relation techniques as well as biochemical assays. The aim of the research was to coordinate basi...


El-Sharkawy, Mabrouk A.[Physiological characteristics of cassava tolerance to prolonged drought in the tropics : Implications for breeding cultivars adapted to seasonally dry and semiarid environments]Physiological characteristics of cassava tolerance to prolonged drought in the tropics : Implications for breeding cultivars adapted to seasonally dry and semiarid environments

A two-year field trial was conducted to study the effects of prolonged water stress on cassava (Manihot esculenta) productivity, and on nutrient uptake and use efficiency. Four contrasting cultivars were supplied with adequate fertilization and watering, except when water was excluded by covering...


El-Sharkawy, Mabrouk A.Cadavid López, Luis Fernando[Response of cassava to prolonged water stress imposed at different stages of growth]Response of cassava to prolonged water stress imposed at different stages of growth

Cassava (Manihot esculenta Crantz) is a staple food for a large sector of human population in the tropics. It is widely produced for its starchy roots by small farmers over a range of environments on poor infertile soils with virtually no inputs. It is highly productive under favorable conditions...


El-Sharkawy, Mabrouk A.Cock, James H.[Response of cassava to water stress]Response of cassava to water stress

Two contrasting clones of cassava (Manihot esculenta) were reciprocally grafted to test the hypothesis that the yield of cassava is limited by the number of storage roots. Effects of the root sink on leaf gas exchange were also tested under field conditions using a portable infra-red gas analyzer...


Pellet, DEl-Sharkawy, Mabrouk A.[Sink-source relations in cassava: Effects of reciprocal grafting on yield and leaf photosynthesis]Sink-source relations in cassava: Effects of reciprocal grafting on yield and leaf photosynthesis

Using the infra-red gas analysis system, the rate of CO2 uptake, transpiration, leaf conductance and water use efficiency were determined on attached leaves of cassava cv. MCol 1522 and CG 403-18, which were grown in pots left outdoors. In the stress treatment, the water was withheld from the fou...


Guzmán R., G.El-Sharkawy, Mabrouk A.[Efecto de la disponibilidad hidrica del suelo sobre la anatomia foliar y el intercambio gaseoso de dos cultivares de yuca (Manihot esculenta Crantz)]Efecto de la disponibilidad hidrica del suelo sobre la anatomia foliar y el intercambio gaseoso de dos cultivares de yuca (Manihot esculenta Crantz)
El-Sharkawy, Mabrouk A.[Global warming: causes and impacts on agroecosystems productivity and food security with emphasis on cassava comparative advantage in the tropics - subtropics]Global warming: causes and impacts on agroecosystems productivity and food security with emphasis on cassava comparative advantage in the tropics - subtropics

To determine the presence of Kranz anatomy, chloroplast structure and distribution in cassava leaf tissues, a selection was made among materials of CIAT`s germplasm bank. Two materials were selected, var. MCol 22 and hybrid CM 507-37; work was also carried out with maize var. Swan Laposta C48B (m...


Riano, N.M.Cock, James H.López F., Y.El-Sharkawy, Mabrouk A.[Anatomia Kranz, estructura y distribucion de cloroplastos en hojas de yuca (Manihot esculenta Crantz)]Anatomia Kranz, estructura y distribucion de cloroplastos en hojas de yuca (Manihot esculenta Crantz)

Cassava, bean, and maize leaves were fed with (14)CO2 in light; the primary products of photosynthesis were identified 5 and 10 s after assimilation. In cassava, approx. 40-60 percent were incorporated in C4 acids with 30-50 percent in phosphoglyceric acid, which indicates that cassava possesses ...


Riano, N.M.Cock, James H.López F., Y.El-Sharkawy, Mabrouk A.Bastidas, G.[Caracteristicas fotosinteticas de la yuca (Manihot esculenta Crantz): Productos iniciales de fijacion con (14)CO2]Caracteristicas fotosinteticas de la yuca (Manihot esculenta Crantz): Productos iniciales de fijacion con (14)CO2

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