Grain sorghum hybrids under drought stress and full‐irrigation conditions in the Brazilian Semiarid

Menezes, C. B. de; Silva, Karla Jorge da; Teodoro, Larissa Pereira Ribeiro; Santos, C. V. dos; Julio, Bruno Henrique Mingote; Portugal, Arley Figueiredo; Batista, Paulo Sérgio; Carvalho, Abner José de; Teodoro, Paulo Eduardo

doi:10.1111/jac.12539

Cited by 6 publications

(4 citation statements)

References 20 publications

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“…In contrast, plant growth and development, above-ground biomass, and grain production were more affected by early drought stress with a decrease of 62% for stem biomass, 55% for leaf biomass, and 62% for panicle dry weight. Previous studies have also reported a decrement of plant height, above-ground biomass and grain production under early vegetative drought stress conditions [11,30,31]. In this study, the fact that the grain number per panicle was more affected by early vegetative drought compared to late vegetative drought could be explained by the fact that panicle growth starts very early inside the shoot from the growing point differentiation onwards.…”

Section: Drought Stress Effect On Plant Phenology Growth and Developm...supporting

confidence: 52%

Precision Phenotyping of Agro-Physiological Responses and Water Use of Sorghum under Different Drought Scenarios

et al. 2023

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Understanding sorghum response to water stress at different developmental stages is important for developing sorghum varieties with improved tolerance to drought. This study set out to finely characterize key agro-physiological responses and water use of sorghum subjected to different drought scenarios. A greenhouse experiment was conducted using a DroughtSpotter facility that enables real-time quantification of water use by gravimetric tracking. Four different water treatments were assessed: (i) early vegetative drought stress (DS1), (ii) DS1 plus recovery (DS1R), (iii) late vegetative drought stress (DS2), and (iv) well-watered (WW). Plant pheno-morphology and yield data were recorded. Leaf fluorescence and photosynthesis were continuously recorded throughout the experiment. Our results showed that green leaf number and plant leaf area were more affected by DS2 than DS1 and delayed plant flowering. Nevertheless, plants in DS2 were taller and produced higher stem and leaf biomass compared to DS1. No significant difference was recorded in grain yield between DS1 and DS2 but were outperformed by DS1R and WW. The transpiration and photosynthetic rates were shown to decrease at the same time as the stomatal conductance. This can therefore be assimilated to a stomatal down-regulation limiting CO2 uptake. However, the increase in intercellular CO2 concentration is likely to indicate the presence of CO2 in the substomatal cavity that was not conveyed to the carboxylation sites. This suggests a non-stomatal limitation of the photosynthesis. Moreover, the plants recovered quite well from DS1, and this was more prominent for physiological parameters than morphological ones. Globally, water use efficiency (WUE) for DS2 was higher compared to WW and DS1 treatments, confirming the growing point differentiation as a critical stage where drought stress should be avoided to ensure yield and better WUE. Adaptation responses were related to the reduction of transpiration through plant leaf area reduction, the reduction of stomatal conductance, and the increase of intercellular CO2 limiting photosynthesis. Further studies focusing on the biomarkers of stress and transcriptomic analyses are needed to provide further insight into the drought adaptation mechanisms of this line.

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Section: Drought Stress Effect On Plant Phenology Growth and Developm...supporting

confidence: 52%

Precision Phenotyping of Agro-Physiological Responses and Water Use of Sorghum under Different Drought Scenarios

et al. 2023

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“…The results for DF differ from those obtained by Galicia-Juárez et al (2020), who reported early genotypes with a flowering range of 51 to 71 days, and late genotypes with a range of 72 to 79 days. Early cycle sorghums are tolerant of drought and high temperatures, they can also have higher yields compared to late flowering varieties (Menezes et al, 2021), because early maturing sorghums can evade the stress of a late drought through earlier grain filling, as this becomes a limitation for sorghum production worldwide (Wang et al, 2020). However, late sorghums are characterized by reaching a greater length and diameter of the stem and number of internodes, which are used to produce ethanol because of their high content of juice and sugar (Naoura et al, 2020).…”

Section: Agronomic Parametersmentioning

confidence: 99%

Grain yield, nutritional, polyphenols and antioxidant capacity in accessions of sorghum (Sorghum bicolor L. Moench)

UÑATE-FRAGA

García-López

Naveda

et al. 2022

Not Bot Horti Agrobo

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Sorghum is an economically important crop in developing countries. The objective of this study was to compare the agronomic performance, and the chromatic, nutritional and nutraceutical properties of nineteen sorghum accessions cultivated in Tamaulipas, Mexico. Results showed that the grain yield (15.22 to 70.18 g per plant), days to flowering (73 to 92 days), panicle length (16.63 to 27.67 cm), luminosity (27.14 to 57.75), chromaticity (5.65 to 15.33) and hue angle (38.49 to 82.66) varied. The percentage of protein (7.33 to 3.43%), fiber (0.60 to 3.03%) and carbohydrates (70.17 to 78.39%) also varied. Grains had a high concentration of magnesium, phosphorus and potassium; the content of total phenols and total flavonoids (free + bound) was found in a range of 117.61 to 2367.01 mg GAE/100 g and 22.52 to 613.92 mg CE/100 g, respectively. The antioxidant capacities (free + bound) showed ranges from 65.09 to 2,017.58 μmol TE/100 g, 43.13 to 1,907.99 μmol TE/100 g and 107.20 to 3,523.20 μmol TE/100 g using the ABTS, DPPH and FRAP methods, respectively. A negative correlation (-0.36) was observed between grain yield and days to flowering. In addition, a positive correlation between phenolic compounds and antioxidant capacity. These results confirm an important genetic diversity among the studied accessions of sorghum.

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“…This provides the real drought environment; a crop will experience during future production. Menezes et al (2021) evaluated sorghum hybrids in the field under water stress conditions and identified drought-tolerant genotypes with high yield potential.…”

Section: Phenotyping For Drought Tolerance Under Filed Conditionsmentioning

confidence: 99%

Drought stress in sorghum: Mitigation strategies, breeding methods and technologies—A review

Yahaya

Shimelis

2021

J Agronomy Crop Science

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Agriculture accounts for 70% of the global use of available freshwater. Projections show that demand for water will increase significantly due to climate change, population growth and development of agricultural enterprises globally. There is a need to develop water-use efficient crop cultivars for sustainable agricultural production.Sorghum [Sorghum bicolor (L.) Moench.] is a powerhouse crop in drier regions supporting more than 500 million people. It is a relatively drought-tolerant crop adapted to grow and yield in marginal environments where other dominant crops such as maize and wheat fail to survive. However, the mean yield of sorghum in the semi-arid regions has stagnated around 1.0 ton/ha compared with the global average of 2.5 ton/ ha, mainly due to recurrent droughts and heat stress. Breeding for drought-tolerant cultivars is an economic and sustainable mitigation strategy against the current and projected drought stress. Therefore, the objectives of this review were to document the impact of drought stress and the key mitigation strategies under drought-prone semi-arid sorghum production systems. The first section of the review highlighted the impact of drought and its mitigation strategies emphasizing on the use of droughttolerant cultivars as the best strategy. This is followed by perspectives on aspects of drought-response mechanisms, breeding methods and complementary technologies for drought tolerance. Integration of the conventional and molecular breeding technologies with rapid generation advancement methods could reduce the breeding cycle and increase the efficiency of deploying new varieties. Information presented in this review will guide agronomists and breeders to develop and deploy droughttolerant sorghum cultivars that are adapted to the changing production environments in the semi-arid regions.

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Grain sorghum hybrids under drought stress and full‐irrigation conditions in the Brazilian Semiarid

Cited by 6 publications

References 20 publications

Precision Phenotyping of Agro-Physiological Responses and Water Use of Sorghum under Different Drought Scenarios

Precision Phenotyping of Agro-Physiological Responses and Water Use of Sorghum under Different Drought Scenarios

Grain yield, nutritional, polyphenols and antioxidant capacity in accessions of sorghum (Sorghum bicolor L. Moench)

Drought stress in sorghum: Mitigation strategies, breeding methods and technologies—A review

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