A sorghum <i>gigantea</i> mutant attenuates florigen gene expression and delays flowering time

Abdul-Awal, SM; Chen, Junping; Xin, Zhanguo; Harmon, Frank G.

doi:10.1002/pld3.281

Cited by 15 publications

(15 citation statements)

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“…guttatus , an obligate long‐day plant, in part through natural variation in critical photoperiod (Kooyers et al, 2015). Thus, consistent with its well described and conserved role in photoperiodic flowering (Abdul‐Awal et al, 2020; Bendix et al, 2013; Fowler et al, 1999; Hayama et al, 2003; Hecht et al, 2007; Park et al, 1999; Sawa & Kay, 2011), natural variation in GI expression or protein function could relate to the elevational cline previously described for this component of flowering time regulation (Kooyers et al, 2015). Several studies in trees have also described nonsynonymous polymorphisms in GI homologues associated with phenology or environmental clines (Chen et al, 2014; Holliday et al, 2010; Keller et al, 2012).…”

Section: Discussionsupporting

confidence: 85%

Adaptive and nonadaptive causes of heterogeneity in genetic differentiation across the Mimulus guttatus genome

et al. 2021

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How genetic variation is distributed within and among discrete but interconnected populations, or population structure, reflects how various evolutionary processes have introduced variation and influenced mating patterns over time (Blair, 1943;Wright, 1949). As molecular marker approaches for characterizing population structure have been succeeded by reduced-representation or wholegenome sequencing approaches (Bossart & Pashley Prowell, 1998), it has become increasingly appreciated that estimates of population

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Section: Discussionsupporting

confidence: 85%

Adaptive and nonadaptive causes of heterogeneity in genetic differentiation across the Mimulus guttatus genome

et al. 2021

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“…Mutation of FLD in Arabidopsis (He et al, 2003) and RNA interference of its homolog in rice (Shibaya et al, 2016) delays flowering. The flowering genes: CONSTITUTIVE PHOTOMORPHOGENIC 1 (ScCOP1) (Tanaka et al, 2011), CYCLING DOF FACTOR1 (ScCDF1) (Higgins et al, 2010), SHORT VEGETATIVE (ScSVP-1 and -3) (Higgins et al, 2010), SUPPRESSOR OF CONSTANS OVEREXPRESSION 1 (ScSOC1) (Higgins et al, 2010), FLOWERING LOCUS T (ScFT) (Abdul-Awal et al, 2020) and APETALA (ScAP1) (Preston & Kellogg, 2006) peak on average 2 h earlier in 4 mo sugarcane leaves, except for ScSVP-2 (Figs 2e,f, S6).…”

Section: Resultsmentioning

confidence: 99%

Field microenvironments regulate crop diel transcript and metabolite rhythms

et al. 2021

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Most research in plant chronobiology has been done in laboratory conditions. However, laboratories usually fail to mimic natural conditions and their slight fluctuations, highlighting or obfuscating rhythmicity. High-density crops, such as sugarcane (Saccharum hybrid), generate field microenvironments with specific light and temperature regimes resulting from mutual shading.We measured the metabolic and transcriptional rhythms in the leaves of 4-month-old (4 mo) and 9 mo field-grown sugarcane. Most of the assayed rhythms in 9 mo sugarcane peaked >1 h later than in 4 mo sugarcane, including rhythms of the circadian clock gene, LATE ELONGATED HYPOCOTYL (LHY).We hypothesized that older sugarcane perceives dawn later than younger sugarcane as a consequence of self-shading. As a test, we measured LHY rhythms in plants on the east and the west sides of a field. We also tested if a wooden wall built between lines of sugarcane plants changed their rhythms. The LHY peak was delayed in the plants in the west of the field or beyond the wall; both shaded at dawn.We conclude that plants in the same field may have different phases resulting from field microenvironments, impacting important agronomical traits, such as flowering time, stalk weight and number.

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“…SbGI was recently shown to be involved in photoperiodic flowering time in sorghum (Abdul-Awal et al, 2020), which is a conserved function. In Arabidopsis, GI has also been implicated in drought escape through regulation of flowering time in a ABA-dependent manner (Riboni et al, 2016), and more recently was shown to modulate transcription of nine-cis-epoxycarotenoid dioxygenase 3 (NCED3), a rate-limiting enzyme in ABA biosynthesis, a mechanism by which diurnal stomatal movement could be modulated (Baek et al, 2020).…”

Section: Resultsmentioning

confidence: 99%

Regulatory signatures of drought response in stress resilientSorghum bicolor

Parvathaneni

Kumar

Braud

et al. 2020

Preprint

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The effects of drought stress can be devastating to crop production worldwide. A grand challenge facing agriculture is the development of crop varieties with improved drought resilience through breeding or biotechnology. To accelerate this, a mechanistic understanding is needed of the regulatory networks underlying drought response pathways in crop genomes and the genetic elements that modulate them. In this study, we explore the regulatory landscape of sorghum [Sorghum bicolor (L.) Moench] in response to controlled-environment drought stress. Sorghum is a C4 cereal crop with innate drought resilience and is an untapped resource of allelic diversity. To define molecular signatures of drought response, we mapped genome-wide chromatin accessibility using an Assay for Transposase Accessible Chromatin by sequencing (ATAC-seq) and analyzed parallel transcriptional profiles in drought-stressed sorghum shoot and root tissues compared to well-watered controls. Drought-responsive changes in chromatin accessibility were largely found in proximal promoters of differentially expressed genes and also in distal regions of the genome. These data were integrated to infer gene network connections and cis-regulatory modules that underlie drought response in sorghum, including cross-talk among hormone and nutrient pathways and the transcription factors that control them. Our analyses provide drought-inducible regulatory modules in the sorghum genome that can be leveraged for fine-tuning responses to stress, mining diversity for advantageous alleles, and translating across species to ultimately improve productivity and sustainability in sorghum and closely related cereal crops.

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A sorghum gigantea mutant attenuates florigen gene expression and delays flowering time

Abstract: This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.

Cited by 15 publications

References 47 publications

Adaptive and nonadaptive causes of heterogeneity in genetic differentiation across the Mimulus guttatus genome

Adaptive and nonadaptive causes of heterogeneity in genetic differentiation across the Mimulus guttatus genome

Field microenvironments regulate crop diel transcript and metabolite rhythms

Regulatory signatures of drought response in stress resilientSorghum bicolor

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