A guideline for leaf senescence analyses: from quantification to physiological and molecular investigations

Bresson, Justine; Bieker, Stefan; Riester, Lena; Doll, Jasmin; Zentgraf, Ulrike

doi:10.1093/jxb/erx246

Cited by 99 publications

(106 citation statements)

References 104 publications

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“…Therefore, the reserves are mobilized from leaves and stems, accelerating the senescence process and reducing the photosynthetic activity (Bresson et al, 2018). The average levels of nutrients in the leaves, stems, panicle and grains in each harvest time can be seen in Table 3.…”

Section: Resultsmentioning

confidence: 99%

Macronutrients Absorption and Dry Matter Accumulation in Grain Sorghum

Borges

Teixeira

Brandão

et al. 2018

RBMS

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-The present study aimed to determine the curves of macronutrients and dry matter accumulation in grain sorghum DKB 599, grown in a semiarid region. A field experiment was conducted on a sandy loam eutrophic red Latosol (Oxisol) in Janaúba, State of Minas Gerais (MG), Brazil, in a randomized block design with four replications.As statistical method, a nonlinear regression, sigmoidal function with three parameters was used. After drying, the plants were weighed and ground to determine N, P, K, Ca, Mg and S concentration. Grain sorghum plants accumulate nutrients in their shoots in the following order: N> K> Ca> P> Mg> S. The highest concentrations of K and N were observed in stems and grains, respectively. In the conditions of this experiment, the most favorable time to perform nitrogen and potassium topdressing fertilization is when the plants present seven fully expanded leaves or 24 days after the emergency (DAE).Keywords: fertilization, growth, nutrition, Sorghum bicolor. ABSORÇÃO DE MACRONUTRIENTES E ACÚMULO DE MATÉRIA SECA NO SORGO GRANÍFERORESUMO -Este trabalho teve como objetivo determinar as curvas de acúmulo de matéria seca e macronutrientes no sorgo DKB 599 cultivado em região semiárida. O experimento foi conduzido em campo sobre um Latossolo Vermelho eutrófico, de textura franco-argilosa, no município de Janaúba-MG, Brasil, em delineamento experimental de blocos casualizados, com quatro repetições. Utilizou-se o modelo de regressão não linear, função sigmoidal com três parâmetros como método estatístico. Após secagem, cada parte da planta foi pesada e moída para, em seguida, determinarem-se os teores de N, P, K, Ca, Mg e S. As plantas de sorgo granífero acumulam nutrientes em sua parte aérea na seguinte ordem: N > K > Ca > P > Mg > S. As maiores concentrações de K e N foram observadas, respectivamente, nos caules e nos grãos. Nas condições de condução do experimento, a época mais propícia para realizar a adubação nitrogenada e potássica em cobertura é quando as plantas apresentam sete folhas totalmente expandidas ou 24 dias após a emergência (DAE).Palavras-chave: fertilização, crescimento, nutrição, Sorghum bicolor.

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Section: Resultsmentioning

confidence: 99%

Macronutrients Absorption and Dry Matter Accumulation in Grain Sorghum

Borges

Teixeira

Brandão

et al. 2018

RBMS

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“…senescence during a dark-induced senescence treatment (Bresson et al, 2018). Before the induction of senescence, all samples showed the same level of PSII efficiency values (F v /F m ; Fig.…”

Section: Decreased Expression Of Sa-associated Genes Is Consistent Wimentioning

confidence: 87%

Senescence and Defense Pathways Contribute to Heterosis

et al. 2019

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Hybrids are used extensively in agriculture due to their superior performance in seed yield and plant growth, yet the molecular mechanisms underpinning hybrid performance are not well understood. Recent evidence has suggested that a decrease in basal defense response gene expression regulated by reduced levels of salicylic acid (SA) may be important for vigor in certain hybrid combinations. Decreasing levels of SA in the Arabidopsis (Arabidopsis thaliana) accession C24 through the introduction of the SA catabolic enzyme salicylate1 hydroxylase (NahG) increases plant size, phenocopying the large-sized C24/Landsberg erecta (Ler) F1 hybrids. C24♀ 3 Ler♂ F1 hybrids and C24 NahG lines shared differentially expressed genes and pathways associated with plant defense and leaf senescence including decreased expression of SA biosynthetic genes and SA response genes. The expression of TL1 BINDING TRANSCRIPTION FACTOR1, a key regulator in resource allocation between growth and defense, was decreased in both the F1 hybrid and the C24 NahG lines, which may promote growth. Both C24 NahG lines and the F1 hybrids showed decreased expression of the key senescence-associated transcription factors WRKY53, NAC-CONTAINING PROTEIN29, and ORESARA1 with a delayed onset of senescence compared to C24 plants. The delay in senescence resulted in an extension of the photosynthetic period in the leaves of F1 hybrids compared to the parental lines, potentially allowing each leaf to contribute more resources toward growth.

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“…Thus, NPQ, PSII activity of non-dark-adapted leaves (Fv9/Fm9), and PSII activity of dark-adapted leaves (Fv/Fm) are all reasonable parameters for measuring photosynthetic activity. Our approach to record Fv/Fm of dark-adapted plants, a widely used parameter to access photosynthetic activity and senescence (Maxwell and Johnson, 2000;Wingler et al, 2004Wingler et al, , 2010Bresson et al, 2018), provides a better estimation of photosynthetic activity and therefore senescence.…”

Section: Discussionmentioning

confidence: 99%

Integrated Genome-Scale Analysis Identifies Novel Genes and Networks Underlying Senescence in Maize

et al. 2019

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Premature senescence in annual crops reduces yield, while delayed senescence, termed stay-green, imposes positive and negative impacts on yield and nutrition quality. Despite its importance, scant information is available on the genetic architecture of senescence in maize (Zea mays) and other cereals. We combined a systematic characterization of natural diversity for senescence in maize and coexpression networks derived from transcriptome analysis of normally senescing and stay-green lines. Sixty-four candidate genes were identified by genome-wide association study (GWAS), and 14 of these genes are supported by additional evidence for involvement in senescence-related processes including proteolysis, sugar transport and signaling, and sink activity. Eight of the GWAS candidates, independently supported by a coexpression network underlying stay-green, include a trehalose-6-phosphate synthase, a NAC transcription factor, and two xylan biosynthetic enzymes. Source-sink communication and the activity of cell walls as a secondary sink emerge as key determinants of staygreen. Mutant analysis supports the role of a candidate encoding Cys protease in stay-green in Arabidopsis (Arabidopsis thaliana), and analysis of natural alleles suggests a similar role in maize. This study provides a foundation for enhanced understanding and manipulation of senescence for increasing carbon yield, nutritional quality, and stress tolerance of maize and other cereals.

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A guideline for leaf senescence analyses: from quantification to physiological and molecular investigations

Cited by 99 publications

References 104 publications

Macronutrients Absorption and Dry Matter Accumulation in Grain Sorghum

Macronutrients Absorption and Dry Matter Accumulation in Grain Sorghum

Senescence and Defense Pathways Contribute to Heterosis

Integrated Genome-Scale Analysis Identifies Novel Genes and Networks Underlying Senescence in Maize

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