Element content and distribution has limited, tolerance metric dependent, impact on salinity tolerance in cultivated sunflower (<i>Helianthus annuus</i>)

Temme, Andries A.; Burns, Victoria A.; Donovan, Lisa A.

doi:10.1002/pld3.238

Cited by 5 publications

(5 citation statements)

References 54 publications

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“…in biomass. This was unexpected given that prior work on sunflower has shown this negative relationship under salinity stress: plants with more biomass in control treatment had a larger proportional decline in response to salinity stress (Temme et al, 2019;Temme, Burns, & Donovan, 2020;Temme, Kerr, et al, 2020;Tran et al, 2020). The differences between the salinity stress and drought stress effects may lie at the heart of this (Forni et al, 2017;Munns, 2002).…”

Section: Discussionmentioning

confidence: 88%

“…Eight wild populations (hereafter “accessions”) were chosen from a geographically diverse spread across the range within the United States (Table S1). Eight inbred genotypes (hereafter “accessions”) of cultivated H. annuus (Table S1) were chosen to encompass a range of growth potentials expected to overlap with those of the wild accessions, based on previous phenotypic screens (McAssey et al, 2016; Temme et al, 2019; Temme, Burns, & Donovan, 2020; Temme, Kerr, et al, 2020; Tran et al, 2020).…”

Section: Methodsmentioning

confidence: 99%

“…Objective 1 was to test whether wild and cultivated accessions differ in tolerance of moderate drought, with tolerance defined as the proportional reduction in biomass in response to drought. As part of supporting this metric of tolerance, we additionally assessed whether tolerance was associated with vigor (biomass in control treatment) because of previous observations of a general trade‐off between plant growth or size and stress tolerance in sunflowers under drought (Koziol et al, 2012; Mayrose et al, 2011) and salinity stress (Temme et al, 2019; Temme, Burns, & Donovan, 2020; Temme, Kerr, et al, 2020; Tran et al, 2020). Objective 2 was to test whether wild and cultivated accessions differ in response s of several traits expected to be associated with drought tolerance, including allocational, leaf morphological, stomatal, and physiological traits.…”

Section: Introductionmentioning

confidence: 99%

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Cultivated sunflower (Helianthus annuus L.) has lower tolerance of moderate drought stress than its con‐specific wild relative, but the underlying traits remain elusive

Tran,

Nolting,

Donovan

et al. 2024

Plant Direct

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Cultivated crops are generally expected to have less abiotic stress tolerance than their wild relatives. However, this assumption is not well supported by empirical literature and may depend on the type of stress and how it is imposed, as well as the measure of tolerance being used. Here, we investigated whether wild and cultivated accessions of Helianthus annuus differed in stress tolerance assessed as proportional decline in biomass due to drought and whether wild and cultivated accessions differed in trait responses to drought and trait associations with tolerance. In a greenhouse study, H. annuus accessions in the two domestication classes (eight cultivated and eight wild accessions) received two treatments: a well‐watered control and a moderate drought implemented as a dry down followed by maintenance at a predetermined soil moisture level with automated irrigation. Treatments were imposed at the seedling stage, and plants were harvested after 2 weeks of treatment. The proportional biomass decline in response to drought was 24% for cultivated H. annuus accessions but was not significant for the wild accessions. Thus, using the metric of proportional biomass decline, the cultivated accessions had less drought tolerance. Among accessions, there was no tradeoff between drought tolerance and vigor assessed as biomass in the control treatment. In a multivariate analysis, wild and cultivated accessions did not differ from each other or in response to drought for a subset of morphological, physiological, and allocational traits. Analyzed individually, traits varied in response to drought in wild and/or cultivated accessions, including declines in specific leaf area, leaf theoretical maximum stomatal conductance (gsmax), and stomatal pore length, but there was no treatment response for stomatal density, succulence, or the ability to osmotically adjust. Focusing on traits associations with tolerance, plasticity in gsmax was the most interesting because its association with tolerance differed by domestication class (although the effects were relatively weak) and thus might contribute to lower tolerance of cultivated sunflower. Our H. annuus results support the expectation that stress tolerance is lower in crops than wild relatives under some conditions. However, determining the key traits that underpin differences in moderate drought tolerance between wild and cultivated H. annuus remains elusive.

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Section: Discussionmentioning

confidence: 88%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Cultivated sunflower (Helianthus annuus L.) has lower tolerance of moderate drought stress than its con‐specific wild relative, but the underlying traits remain elusive

Tran,

Nolting,

Donovan

et al. 2024

Plant Direct

Self Cite

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“…traits that scale with mass) or active (i.e., traits that scale independently from mass; [29]). Importantly, this means that the effects of stress are often best observed using size-independent phenotypes which do not vary as a result of allometric scaling and differences in overall vigor [30][31][32][33]. In the case of water or nutrient limitation, increased root growth and altered root morphology (e.g., more root tips) can improve resource acquisition [e.g., 23,24].…”

Section: Introductionmentioning

confidence: 99%

Phenotypic and transcriptomic responses of cultivated sunflower seedlings (Helianthus annuus L.) to four abiotic stresses

et al. 2022

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Plants encounter and respond to numerous abiotic stresses during their lifetimes. These stresses are often related and could therefore elicit related responses. There are, however, relatively few detailed comparisons between multiple different stresses at the molecular level. Here, we investigated the phenotypic and transcriptomic response of cultivated sunflower (Helianthus annuus L.) seedlings to three water-related stresses (i.e., dry-down, an osmotic challenge, and salt stress), as well as a generalized low-nutrient stress. All four stresses negatively impacted seedling growth, with the nutrient stress having a more divergent response from control as compared to the water-related stresses. Phenotypic responses were consistent with expectations for growth in low-resource environments, including increased (i.e., less negative) carbon fractionation values and leaf C:N ratios, as well as increased belowground biomass allocation. The number of differentially expressed genes (DEGs) under stress was greater in leaf tissue, but roots exhibited a higher proportion of DEGs unique to individual stresses. Overall, the three water-related stresses had a more similar transcriptomic response to each other vs. nutrient stress, though this pattern was more pronounced in root vs. leaf tissue. In contrast to our DEG analyses, co-expression network analysis revealed that there was little indication of a shared response between the four stresses in despite the majority of DEGs being shared between multiple stresses. Importantly, osmotic stress, which is often used to simulate drought stress in experimental settings, had little transcriptomic resemblance to true water limitation (i.e., dry-down) in our study, calling into question its utility as a means for simulating drought.

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“…traits that scale with mass) or active (i.e., traits that scale independently from mass; Wang et al, 2020). Importantly, this means that the effects of stress are often best observed using size-independent phenotypes which do not vary as a result of allometric scaling and differences in overall vigor (e.g., Temme et al, 2020bTemme et al, , 2020aTemme et al, , 2019Tran et al, 2020). In the case of water or nutrient limitation, increased root growth and altered root morphology (e.g., more root tips) can improve resource acquisition (e.g, Chapin, 1991;Grime, 1977).…”

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confidence: 99%

Phenotypic and transcriptomic responses of cultivated sunflower seedlings (Helianthus annuus L.) to four abiotic stresses

Barnhart¹,

Masalia²,

Mosley³

et al. 2021

Preprint

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Plants encounter and respond to numerous abiotic stresses during their lifetimes. These stresses are often related and could therefore elicit related responses. There are, however, relatively few detailed comparisons between multiple different stresses at the molecular level. Here, we investigated the phenotypic and transcriptomic response of cultivated sunflower (Helianthus annuus L.) seedlings to three water-related stresses (i.e., dry-down, an osmotic challenge with polyethylene glycol 6000 [PEG], and salt stress), as well as a generalized low-nutrient stress. Our goal was to identify commonalities in the response to the three water-related stresses and compare them to a distinct low-nutrient stress. All four stresses negatively impacted seedling growth, with the low-nutrient stress having a more divergent response from control as compared to the water-related stresses. Observed phenotypic responses were consistent with expectation for growth in low-resource environments, including increased (i.e., less negative) carbon fractionation values and leaf C:N ratios, as well as increased belowground biomass allocation. Analysis of the leaf and root transcriptome under each stress scenario revealed that most genes were differentially expressed in response to multiple stresses. The number of differentially expressed genes (DEGs) under stress was greater in leaf tissue, but roots exhibited a higher proportion of DEGs unique to individual stresses. Overall, the three water-related stresses had a more similar transcriptomic response to each other vs. low-nutrient stress, though this pattern was more pronounced in root tissue than in leaf tissue. In contrast with the results of our differential expression analysis, co-expression network analysis revealed that the response to each of the four stresses in our study were generally non-overlapping and there was little indication of a shared co-expression response despite the majority of DEGs being shared between multiple stresses. Importantly, PEG stress, which is often used to simulate drought stress in experimental settings, had little transcriptomic resemblance to true water limitation (i.e., dry-down) in our study calling into question its utility as a means for simulating drought.

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Element content and distribution has limited, tolerance metric dependent, impact on salinity tolerance in cultivated sunflower (Helianthus annuus)

Cited by 5 publications

References 54 publications

Cultivated sunflower (Helianthus annuus L.) has lower tolerance of moderate drought stress than its con‐specific wild relative, but the underlying traits remain elusive

Cultivated sunflower (Helianthus annuus L.) has lower tolerance of moderate drought stress than its con‐specific wild relative, but the underlying traits remain elusive

Phenotypic and transcriptomic responses of cultivated sunflower seedlings (Helianthus annuus L.) to four abiotic stresses

Phenotypic and transcriptomic responses of cultivated sunflower seedlings (Helianthus annuus L.) to four abiotic stresses

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