The tolerance of grain amaranth (Amaranthus cruentus L.) to defoliation during vegetative growth is compromised during flowering

Vargas‐Ortiz, Erandi; Délano‐Frier, John Paul; Tiessen, Axel

doi:10.1016/j.plaphy.2015.03.007

Cited by 12 publications

(27 citation statements)

References 15 publications

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“…Amaranth (Amaranthus hypochondriacus L.) is a fastgrowing annual species with good adaptation and high drought resistance (Liu and Stützel, 2004;Vargas-Ortiz et al, 2015). Nearly 20 species of the Amaranthus genus grow wild in Mexico (Slabbert and Kruger, 2011).…”

Section: Introductionmentioning

confidence: 99%

Comparison of Chemical Composition and Growth of Amaranth (Amaranthus hypochondriacus) between Greenhouse and Open Field Systems

Chávez-Servín¹,

Cabrera-Baeza²,

Ugalde³

et al. 2017

IJAB

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. Cultivation was performed directly in irrigated furrows without fertilizers. The same soil type was used for both cropping systems. Number of leaves, plant height, stem diameter, length of seeds, panicle length, biomass and grain yield, grain area, percentage of popped and sprouted grain, and chemical composition were compared. The variables under greenhouse cultivation yielded superior results were grain yield (26.5%), biomass (61.2%), plant height (87.4%), stem diameter (24.3%), number of leaves (2.4%), panicle length (18.4%), percentage of popped grain (2%) and sprouted grain (7%) than field cultivation. Open field cultivation improved protein, fat and ash (9.0%, 17.6% and 43.1%, respectively), and grain size (22.5%) than greenhouse production. Thus, it may be concluded that greenhouse cultivation of A. hypochondriacus crop provides for higher yields, but inferior chemical composition values compared to the open field cultivation system.

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Section: Introductionmentioning

confidence: 99%

Comparison of Chemical Composition and Growth of Amaranth (Amaranthus hypochondriacus) between Greenhouse and Open Field Systems

Chávez-Servín¹,

Cabrera-Baeza²,

Ugalde³

et al. 2017

IJAB

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“…Rather, these results provide a Effect of time on defoliation tolerance: seed yield and protein content While many studies have reported on defoliation tolerance in amaranth, only one has assessed the timing of defoliation. Vargas-Ortiz et al 13 found that during the spring-summer season of their trial in Guanajuato, Mexico, timing of defoliation during vegetative development and bud formation did not significantly impact seed yield. Plants defoliated during flowering, however, had significantly lower yields than those that were defoliated at any point during the vegetative period.…”

Section: Effect Of Fertilization Methods and Irrigation On Nutrientsmentioning

confidence: 89%

“…Plants defoliated during flowering, however, had significantly lower yields than those that were defoliated at any point during the vegetative period. 13 However, the authors found that 100% defoliation did have an effect on seed yield in the autumn-winter season in Guanajuato. Plants defoliated earlier in development had lower yields than those defoliated later during the vegetative stage and during bud formation (plants defoliated during flowering had the lowest seed yields).…”

Section: Effect Of Fertilization Methods and Irrigation On Nutrientsmentioning

confidence: 95%

“…Plants defoliated earlier in development had lower yields than those defoliated later during the vegetative stage and during bud formation (plants defoliated during flowering had the lowest seed yields). 13 The authors attributed the different seasonal responses to carbohydrates stored in source tissues as well as the activity of phosphoenolpyruvate carboxylase, the first enzyme produced by photosynthesis in C4 plants. 14 In comparison, 100% defoliation in this study significantly reduced seed yield in both greenhouse and field conditions, but 50% defoliation did not reduce seed yield at any point.…”

Section: Effect Of Fertilization Methods and Irrigation On Nutrientsmentioning

confidence: 99%

“…Finally, research has shown that harvesting leaves from grain amaranths at moderate levels (50% or less) has no impact on seed yield, or may even slightly increase seed yield. 4,[12][13][14][15] In this paper, we expand upon the work of these authors to measure the optimal timing for defoliation in terms of nutrition and seed yield effects. This question has only been studied in one other published paper, which identified mixed results depending on the season, but which also only assessed the impact of 100% defoliation.…”

Section: Introductionmentioning

confidence: 99%

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Defoliation timing for optimal leaf nutrition in dual‐use amaranth production systems

et al. 2020

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BACKGROUND Amaranth leaves can provide important nutrients to small‐scale farming families growing amaranth for seed. Amaranth is known to be tolerant to defoliation, but there is little guidance on when defoliation should be performed for optimal nutritional benefits. This series of experiments assessed tolerance to defoliation at different points throughout the vegetative stage of development, in addition to the nutritional benefits and flavor of amaranth leaves at each stage. RESULTS Overall, timing of defoliation had no impact on seed yield or quality. Fifty percent defoliation at any point did not significantly reduce seed yield, whereas 100% defoliation throughout development reduced seed yield. The nutritional value of amaranth leaves differed substantially throughout development, with the highest concentrations of iron mid‐way through vegetative development, and the highest levels of vitamin A, magnesium, and copper at the end of the vegetative development stage. Palatability was highest in young leaves, and decreased as plants aged. We also found that neither timing nor intensity of defoliation had an influence on branching, which can negatively influence ease of harvest. CONCLUSIONS These results indicate that amaranth leaves are a nutritious food source that provides vital nutrients at different concentrations throughout development. Farmers who wish to harvest both leaves and seeds can harvest up to 50% of the leaves at any point during vegetative development or bud formation while maintaining seed yield. Leaf harvest timing can thus be tailored to nutritional needs, although palatability decreases with plant age. © 2020 Society of Chemical Industry

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Searching for an Identity: Functional Characterization of Taxonomically Restricted Genes in Grain Amaranth

Cabrales-Orona

Délano‐Frier

2021

Compendium of Plant Genomes

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The tolerance of grain amaranth (Amaranthus cruentus L.) to defoliation during vegetative growth is compromised during flowering

Cited by 12 publications

References 15 publications

Comparison of Chemical Composition and Growth of Amaranth (Amaranthus hypochondriacus) between Greenhouse and Open Field Systems

Comparison of Chemical Composition and Growth of Amaranth (Amaranthus hypochondriacus) between Greenhouse and Open Field Systems

Defoliation timing for optimal leaf nutrition in dual‐use amaranth production systems

Searching for an Identity: Functional Characterization of Taxonomically Restricted Genes in Grain Amaranth

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