Effets d'un stress hydrique appliqué à différents stades de développement sur l'aspect quantitatif et qualitatif des semences chez un écotype autochtone de sorgho grain (<i>Sorghum bicolor</i>)

Abstract

ABSTRACT:Effects of water stress applied at different stages of development on the quantity and quality of autochthonous sorghum seed ecotype (Sorghum bicolor) Objective: The effects of water stress applied at different stages of development on the quantity and quality of seeds were studied in native grain sorghum ecotype. Methodology and Results:The trial was conducted in plant pots. The irrigation of the plants was made together with the successive weighing pots. During each weighing, the control was returned to the same weight corresponding to 70% of the UWR (useful water reserve), whereas stress treatment (SI, S2 and S3) maintained the water content to 30% of the UWR for 10 days. At the end of the cycle of water shortage, irrigation was taken Effets d'un stress hydrique applique a différents stades de développement des semences chez un écotype autochtone de sorgho grain 6150 as the control. Stages affected by water stress were the floral initiation stage (S1), the swelling phase-heading (S2) and the flowering phase -grain filling (S3). The results showed that the yield and seed quality drop significantly when stress is applied at S2 and that the rate of germination and seedling vigour (seeds from S2) fall accordingly. Conclusion and application: these results lead to affirm that the most sensitive water stress phase is that of swelling-heading. The importance of this study is its application in the governance of irrigation. Indeed, under conditions of water scarcity, we must develop t scenarios to deliver water to plants only at critical stages of growth in order to avoid waste.

Adaptation Responses to Early Drought Stress of West Africa Sorghum Varieties

“…However, the reduction of leaf area which is generally observed in plants is a drought avoidance strategy leading to reduction of water loss and inhibition of cell division [20]. Furthermore, early drought generally occurring in the transition stage to panicle initiation and structure affects negatively the flowering and production [21,22] as the first process must take place under favorable environmental conditions. In contrast, few studies have been carried out to enhance our understanding on the effect of re-watering after drought stress, especially on sorghum [23].…”

“…The severity of drought stress likely depends both on crop growth stage and its duration. Depending on the genotype, it is well documented that early maturity accessions are more sensitive to drought during vegetative stage than the late maturity genotypes due to the fact that the stress occurs before the panicle initiation phase when plants have more ability to recover after re-watering [21]. However, these late maturity genotypes no longer suit the farming systems of semi-arid regions because of a shortened rainy season.…”

Agromorphological Characterization of Introgression Lines Derived from Wild and Exotic Sorghum Germplasm to Climate Change Challenges

“…Knowledge of genetic variability is essential in variety selection. Demonstrating this genetic variability for certain morphological traits is the first essential step in the description of genetic resources [23] [24]. The study of the coeffi-cients of genotypic variation of progenies from wild parents (CWR) and parents with high transpiration efficiency (HTE) showed high variability among progenies and within the populations.…”

Agro-physiological responses of okra genotypes cultivated under water deficit conditions

“…This result could be justified by an influence of genetic factors rather than by the water factor which is environmental. Processes involved in crop yield development are influenced by both genetic factors that are intrinsic to the plant and environmental factors (Radhouane et al, 2014).…”