Partitioning index and non-structural carbohydrate dynamics among contrasting cassava genotypes under early terminal water stress

Abstract

Cassava (Manihot esculenta Crantz.) is a storage root crop of importance in tropical regions where periodic dry season and drought affect performance. Cassava genotypes that differ in performance in ecosystems with various water regimes were subjected to water stress during storage-root initiation and early development. Plants were grown in 50 kg pots in a screen house environment under well-watered and water stress for over a 120-day period. Water stress had a significant effect on most traits analyzed. However, relative water content, partitioning index and non-structural carbohydrates were unaffected. Tolerant genotypes had a higher partitioning index than susceptible genotypes during water stress, associated with a larger number of storage roots initiated and larger storage root biomass, while they were shorter and had less fibrous root biomass. Tolerant lines were indistinguishable from susceptible lines in above ground biomass. These

Carbon allocation in cassava is affected by water deficit and potassium application – A 13C‐CO2 pulse labelling assessment

“…Connor et al (1981) 7 showed that under water deficit, the proportion of assimilates routed to the roots increased. Sustained root growth and thus allocation of assimilates to roots under dry conditions was also noted as a favourable trait for increased cassava production under water stressed conditions 20 …”

“…Sustained root growth and thus allocation of assimilates to roots under dry conditions was also noted as a favourable trait for increased cassava production under water stressed conditions. 20 …”

“…Sustained root growth and thus allocation of assimilates to roots under dry conditions was also noted as a favourable trait for increased cassava production under water stressed conditions. 20 To mitigate the effects of drought on yields, potassium application has been proposed. 21,22 Potassium plays a key role in processes such as stomatal regulation, CO 2 fixation, phloem transport of sugars, activation of enzymes in starch synthesis, maintenance of turgor and osmotic regulation.…”

Response of Cassava Tubers Yield and its Components to Different Agricultural Treatments

“…It is mostly grown in tropical and subtropical areas (Alves, 2002;Li et al, 2016 andWang et al, 2018). Cassava is reasonably drought tolerant and is expected to be highly adaptable to future climate change, making it an important crop for food security (Jarvis et al, 2012;Duque and Setter, 2019). Cassava is Africa's fourth largest source of calories (FAO, 2020).…”

Sensory quality and physicochemical properties of cassava roots as a function of technological management levels and harvest times

“…Tolerance on drought associated with high efficiency in the use of nutrients (Fernandes et al, 2019) makes the crop key for both food security and subsistence for developing nations (Duque & Setter, 2019). Cassava is a highly profitable crop and has good production in cultivation systems (Barata et al, 2021).…”