kNACking on heaven’s door: how important are NAC transcription factors for leaf senescence and Fe/Zn remobilization to seeds?

Ricachenevsky, Felipe Klein; Menguer, Paloma Koprovski; Sperotto, Raul Antônio

doi:10.3389/fpls.2013.00226

Cited by 50 publications

(49 citation statements)

References 81 publications

(113 reference statements)

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“…4). In fact, leaf senescence and maturation time are related to remobilization of Zn from leaves into grains (Uauy et al 2006b;Ricachenevsky et al 2013;Distelfeld et al 2014). NAC genes regulate leaf senescence, and future investigations may identify such novel genes in the present doubled-haploid barley population that will greatly help in achieving Zn biofortification targets in cereals.…”

Section: Identified Qtl and Physiology Of Zinc Mobilitymentioning

confidence: 98%

Mapping QTL associated with remobilization of zinc from vegetative tissues into grains of barley (Hordeum vulgare)

et al. 2015

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Background and aims Limited remobilization of Zn from vegetative tissues into grains via phloem is a major physiological barrier against Zn loading into cereal grains. In present experiment, doubled-haploid mapping population (150 lines, derived from Clipper ×Sahara) of barley was genetically characterized for differential Zn remobilization. Methods The germplasm was grown under glasshouse conditions. Leaves (upper three), stem (the rest of the plant) and mature grains were sampled from the maintillers at anthesis and maturity for Zn analysis.Quantitative trait loci (QTL) regulating time to anthesis, plant biomass, Zn concentration in vegetative tissues and remobilization of Zn from these tissues into grains were identified using a genetic linkage map of 485 markers. Results A significant variation existed in grain Zn concentration among the lines (27-75 μg Zn g −1 ), and it correlated with the amount of Zn remobilized from vegetative tissues into grains. Sahara remobilized 37 % of pre-anthesis Zn reserves into grains; the presence of its alleles at all QTL associated with leaf (3 QTL) and stem (2 QTL) Zn remobilization increased the trait score.Conclusions Present study provided an insight into the genetic basis of Zn remobilization from vegetative tissues into barley grains. Such information is useful in breeding for Zn biofortification.

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Section: Identified Qtl and Physiology Of Zinc Mobilitymentioning

confidence: 98%

Mapping QTL associated with remobilization of zinc from vegetative tissues into grains of barley (Hordeum vulgare)

et al. 2015

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“…In the model plant Arabidopsis, overexpression of specific NACs can hasten or delay leaf senescence, although these genes are also usually transcribed during leaf development [98][99][100]. NACs are also important to the remobilization of nutrients during senescence [101]. However, orthologous NACs may or may not have the same function in different plants [101].…”

Section: Overlapping Pathways With Dissimilar Outputs Leading To Senementioning

confidence: 99%

“…NACs are also important to the remobilization of nutrients during senescence [101]. However, orthologous NACs may or may not have the same function in different plants [101]. Using bioinformatics analyses, 92 potential NACs have been identified in switchgrass [96].…”

Section: Overlapping Pathways With Dissimilar Outputs Leading To Senementioning

confidence: 99%

Senescence, dormancy and tillering in perennial C4 grasses

2014

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a b s t r a c tPerennial, temperate, C 4 grasses, such as switchgrass and miscanthus have been tabbed as sources of herbaceous biomass for the production of green fuels and chemicals based on a number of positive agronomic traits. Although there is important literature on the management of these species for biomass production on marginal lands, numerous aspects of their biology are as yet unexplored at the molecular level. Perenniality, a key agronomic trait, is a function of plant dormancy and winter survival of the belowground parts of the plants. These include the crowns, rhizomes and meristems that will produce tillers. Maintaining meristem viability is critical for the continued survival of the plants. Plant tillers emerge from the dormant crown and rhizome meristems at the start of the growing period in the spring, progress through a phase of vegetative growth, followed by flowering and eventually undergo senescence. There is nutrient mobilization from the aerial portions of the plant to the crowns and rhizomes during tiller senescence. Signals arising from the shoots and from the environment can be expected to be integrated as the plants enter into dormancy. Plant senescence and dormancy have been well studied in several dicot species and offer a potential framework to understand these processes in temperate C 4 perennial grasses. The availability of latitudinally adapted populations for switchgrass presents an opportunity to dissect molecular mechanisms that can impact senescence, dormancy and winter survival. Given the large increase in genomic and other resources for switchgrass, it is anticipated that projected molecular studies with switchgrass will have a broader impact on related species.

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“…A growing body of evidence has demonstrated a pivotal role for the NAC genes in the regulation of developmental programmed leaf senescence and programmed cell death. Several NAC genes from different species have been shown to be highly expressed during leaf senescence and to play a pivotal role in leaf senescence (8). In soybean, at least three NAC genes are associated with senescence (9).…”

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confidence: 99%

GmNAC30 and GmNAC81 integrate the endoplasmic reticulum stress- and osmotic stress-induced cell death responses through a vacuolar processing enzyme

Mendes

Reis

Calil

et al. 2013

Proc. Natl. Acad. Sci. U.S.A.

119

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Significance An endoplasmic reticulum stress- and osmotic stress-induced cell death pathway has emerged as a relevant adaptive response of plant cells to multiple environmental stimuli. We identified a unique component of this integrated circuit of stress-induced cell death, the GmNAC30 transcriptional factor, which binds to GmNAC81 in the nucleus of plant cells to coordinately regulate the expression of the vacuolar processing enzyme, a plant-specific executioner of cell death. In addition to describing a plant-specific endoplasmic reticulum stress cell death response that communicates with other environmental stimuli, the study deciphered the regulation of vacuolar processing enzyme expression that has been shown to be involved in several events of cell death in plants.

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kNACking on heaven’s door: how important are NAC transcription factors for leaf senescence and Fe/Zn remobilization to seeds?

Cited by 50 publications

References 81 publications

Mapping QTL associated with remobilization of zinc from vegetative tissues into grains of barley (Hordeum vulgare)

Mapping QTL associated with remobilization of zinc from vegetative tissues into grains of barley (Hordeum vulgare)

Senescence, dormancy and tillering in perennial C4 grasses

GmNAC30 and GmNAC81 integrate the endoplasmic reticulum stress- and osmotic stress-induced cell death responses through a vacuolar processing enzyme

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