Selection for drought tolerance in sorghum using desiccants to simulate post-anthesis drought stress

Ongom, Patrick Obia; Volenec, Jeffrey J.; Ejeta, Gebisa

doi:10.1016/j.fcr.2016.03.015

Cited by 18 publications

(15 citation statements)

References 36 publications

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“…Chl was correlated significantly with GY, HI and biomass. This result suggests that Chl can be an indirect indicator of drought tolerance when a desiccant is applied, since a strong correlation between high Chl and grain yield under drought was reported [22]. (Figure 2a,d), as previously reported [48,49].…”

Section: Effect On Chlorophyll Contentsupporting

confidence: 69%

“…Using KClO 3 enabled us to evaluate plants under optimal conditions, and we found that desiccation had less effect on GY of 'Norin 61' compared to drought (Figure 2a,d). Desiccation has been used in many cereal crops, and reductions in grain yield were comparable to those under drought, making it suitable for evaluation of drought tolerance [4,22,31,32]. Our results show that the photosynthetic source was destroyed within 2 weeks after the imposition of drought and 4 weeks after the application of desiccant.…”

Section: Use Of Chemical Desiccants To Simulate Droughtmentioning

confidence: 50%

“…Most previous reports investigated the response of yield and its components to drought and desiccation. However, it would be beneficial to compare in more detail the responses to chemical desiccation and to drought [22] to understand to what extent desiccation could be applied as screening tool and which parameters can be useful to confirm such screening.…”

Section: Introductionmentioning

confidence: 99%

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Physiological Response of Wheat to Chemical Desiccants Used to Simulate Post-Anthesis Drought Stress

et al. 2018

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Post-anthesis drought stress is one of the main constraints on the production of wheat (Triticum aestivum L.). Because field screening for post-anthesis drought tolerance is difficult, effective and validated methods to simulate drought in order to identify sources of tolerance can facilitate screening of breeding materials. Chemical desiccants are widely used to simulate post-anthesis drought stress. We aimed to identify physiological traits that respond to desiccants as they do to drought. We examined the responses of 'Norin 61' to six treatments in a greenhouse: irrigated control, drought after anthesis, and 2% or 4% potassium chlorate (KClO 3 ) at anthesis (A) or grain filling (GF). We measured δ 13 C in leaves, aboveground fresh biomass, stomatal conductance, chlorophyll content, harvest index, and grain yield. Both 2% and 4% KClO 3 at both A and GF simulated the effect of drought stress. Selection of drought-tolerant genotypes can be aided by chlorophyll content and δ 13 C measurement of leaves when 2% or 4% KClO 3 is used to simulate drought.

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Section: Effect On Chlorophyll Contentsupporting

confidence: 69%

Section: Use Of Chemical Desiccants To Simulate Droughtmentioning

confidence: 50%

Section: Introductionmentioning

confidence: 99%

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Physiological Response of Wheat to Chemical Desiccants Used to Simulate Post-Anthesis Drought Stress

et al. 2018

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“…3.4 ± 2.9 41.8 ± 5.8 * 4.2 ± 3.1 44.0 ± 1.9 * 3.8 ± 3.9 31.5 ± 7.4 * H/S ratio a R2 7.5 10.1 7.9 7.9 8.2 6.5 R4 8.6 1.3 8.0 1.6 7.8 0.9 R5 9.7 2.5 8.2 2.4 7.9 3.1 was long suggested as a tool for analysing genotypic differences in stem reserve-mediated grain filling, when current photosynthesis is limited (Blum et al 1983) and KI was reported to act as a contact desiccant (Tyagi et al 2000). Previous studies reported that KI-induced desiccation leads to a decreased Chl content, stomatal conductance, transpiration, photosynthetic rates, and induces early senescence and maturity (Royo and Blanco 1998, Sawhney and Singh 2002, Bhatia et al 2014, which closely simulates terminal drought stress symptoms and hence, is proposed as a potential tool for screening terminal drought tolerance in field crops (Nezhad et al 2012, Ongom et al 2016. Also, drying initiates several major alterations in the carbohydrate metabolism, which might directly or indirectly correlate with desiccation tolerance.…”

Section: Parametermentioning

confidence: 99%

Photosynthetic performance and sugar variations during key reproductive stages of soybean under potassium iodide-simulated terminal drought

Sengupta¹,

Marriboina²,

Unnikrishnan³

et al. 2019

Photosynt.

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Importance of utilizing chemical desiccants to simulate terminal drought effects is gradually increasing. In the present study, a potassium iodide (KI)-simulated terminal drought stress was imposed during the full bloom (R2), pod elongation (R4), and seed initiation (R5) stages of soybean; the KI-induced desiccation effects were assessed at 1, 3, and 5 d after spraying (DASP). Plants responded to KI-simulated terminal drought stress within 1 DASP of KI-treatment, in terms of photosynthetic and transpiration rates. Seed initiation stage was found to be comparatively tolerant to KI-induced desiccation, with respect to chlorophyll degradation and PSII efficiency, which correlated well with the high hexose accumulation during this period. The present study provides a basic understanding regarding the stage-specific responses of soybean towards KI-simulated terminal drought, with respect to photosynthetic performance and sugar status and a correlation between the two traits, which could be useful for developing terminal drought-tolerant varieties.

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“…Alternative grains are considered to be drought resistant and offer many nutritional benefits not found in commonly used grains in North America (Fischer et al ., ; Ongom et al ., ; Ren et al ., ). Alternative grains considered for this study are grains that are not usually consumed by persons living in North America and include amaranth ( Amarantus ), buckwheat ( Fagopyrum esculentum ), millets (several small grained cereal grasses; most common being pearl millet, Pennusetum glaucum ), sorghum ( Sorghum ), quinoa ( Chenopodium quinoa ), kamut ( Triticum turanicum ), spelt ( Triticum spelta ) and teff ( Eragrostis tef ).…”

Section: Introductionmentioning

confidence: 99%

Consumers’ attitudes towards alternative grains: a conjoint analysis study

Gosine

McSweeney

2019

Int J of Food Sci Tech

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Recently, alternative grains (millet, quinoa, sorghum) have been used to produce several food products common to North Americans. The objective of this study was to identify the attributes that drive consumers liking of alternative grains. A literature review and two focus groups were conducted. Four attributes were identified as being important to consumers when purchasing alternative grains. These attributes included grains, product type, flavour and claims. A choice-based conjoint analysis survey was created and administered to 346 individuals who live in Atlantic Canada. Product type and flavour were the most important attributes to consumers. Sweet and nutty flavours, products made from quinoa, or products with claims indicating they were a source of fibre, reduced risk of type 2 diabetes or reduced risk of cardiovascular disease, had a positive effect on consumer liking.

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Selection for drought tolerance in sorghum using desiccants to simulate post-anthesis drought stress

Cited by 18 publications

References 36 publications

Physiological Response of Wheat to Chemical Desiccants Used to Simulate Post-Anthesis Drought Stress

Physiological Response of Wheat to Chemical Desiccants Used to Simulate Post-Anthesis Drought Stress

Photosynthetic performance and sugar variations during key reproductive stages of soybean under potassium iodide-simulated terminal drought

Consumers’ attitudes towards alternative grains: a conjoint analysis study

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