ArticlePloS one2013
Grain amaranths are defoliation tolerant crop species capable of utilizing stem and root carbohydrate reserves to sustain vegetative and reproductive growth after leaf loss.
Article in PloS one, 2013. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 20 papers.
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20 citing papers in PubMed, 44 citations in OpenAlex.
- Effects of Defoliation Timing and Intensity on Yield Components and Grain Quality of Quinoa (Plants (Basel, Switzerland) · 2025Article
- Sucrose synthase gene family in common bean during pod filling subjected to moisture restriction.Frontiers in plant science · 2024Article
- Comparison of Salt Stress Tolerance among Two Leaf and Six Grain Cultivars ofPlants (Basel, Switzerland) · 2023Article
- Identification of genetic and biochemical mechanisms associated with heat shock and heat stress adaptation in grain amaranths.Frontiers in plant science · 2023Article
- Spatiotemporal dynamics of the tomato fruit transcriptome under prolonged water stress.Plant physiology · 2022Article
- Phenotypic, Anatomical, and Diel Variation in Sugar Concentration Linked to Cell Wall Invertases in Common Bean Pod Racemes under Water Restriction.Plants (Basel, Switzerland) · 2022Article
- Analysis of Global Gene Expression in Maize (Plants (Basel, Switzerland) · 2022Article
- Article
- Highest Defoliation Tolerance inFrontiers in plant science · 2021Article
- High levels of glucose alter Physcomitrella patens metabolism and trigger a differential proteomic response.PloS one · 2020Article
- Identification of Factors Linked to Higher Water-Deficit Stress Tolerance inPlants (Basel, Switzerland) · 2019Article
- Amaranth as a Dual-Use Crop for Leafy Greens and Seeds: Stable Responses to Leaf Harvest Across Genotypes and Environments.Frontiers in plant science · 2019Article
- Partial defoliation ofPeerJ · 2019Article
- Genome-wide analysis of the invertase gene family from maize.Plant molecular biology · 2018Article
- Changes in Within-Shoot Carbon Partitioning in Pinot Noir Grapevines Subjected to Early Basal Leaf Removal.Frontiers in plant science · 2018Article
- Diversity in Grain Amaranths and Relatives Distinguished by Genotyping by Sequencing (GBS).Frontiers in plant science · 2017Article
- Article
- The novel and taxonomically restricted Ah24 gene from grain amaranth (Amaranthus hypochondriacus) has a dual role in development and defense.Frontiers in plant science · 2015Article
- An Experimental Comparison of Two Methods on Photosynthesis Driving Soil Respiration: Girdling and Defoliation.PloS one · 2015Article
- Article
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4 authors at 2 institutions in 1 country.
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No grant is acknowledged in the PubMed record.
Abstract
Tolerance to defoliation can be defined as the degree to which productivity is affected by photosynthetic area reduction. This trait was studied in grain amaranth (Amaranthus cruentus and A. hypochondriacus), which are considered to be a highly defoliation-tolerant species. The physiological and biochemical responses to increasing levels of mechanical leaf removal up to total defoliation were quantified. Tolerance appeared to be dependent on various factors: ( i) amount of lost tissue; (ii) mechanics of leaf tissue removal; (iii) environment, and (iv) species tested. Thus, grain amaranth was found to be a highly tolerant species under green-house conditions when leaf tissue loss was performed by gradual perforation. However, tolerance was compromised under similar conditions when defoliation was done by gradual cutting of the leaf. Also tolerance in completely defoliated plants tended to decrease under field conditions, where differences between A. cruentus and A. hypochondriacus were observed. All non-structural carbohydrate (NSC) levels were reduced in stems and roots of totally defoliated amaranths one day after treatment. Such depletion probably provided the carbon (C) resources needed to sustain the early recovery process in the absence of photosynthetic capacity. This was corroborated by shading of intact plants, which produced the same rapid and drastic reduction of NSC levels in these tissues. These results emphasize the role of stored NSCs, particularly starch, in buffering the impact of severe defoliation in amaranth. The fall in sucrose synthase and cell wall invertase activity observed in stems and roots soon after defoliation was consistent with their predicted shift from sink to source tissues. It is concluded that mobilization of C stores in stems and roots, is a physiologically important trait underlying tolerance to defoliation in grain amaranth.
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