Flower abscission: environmental control, internal regulation and physiological responses of plants

Ascough, G.D.; Nogemane, Noluyolo; Mtshali, Ntombizamatshali Prudence.; Staden, J. Van; Bornman, Chris H.

doi:10.1016/s0254-6299(15)30101-0

Cited by 27 publications

(21 citation statements)

References 165 publications

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“…The knowledge of the role of ethylene in abscission is routinely utilized to control organ abscission in agricultural practices. For example, ethylene releasing compounds are used for thinning of flowers and fruitlets, while ethylene inhibitors are used for inhibiting abscission of flowers, leaves, fruitlets, and fruits (Cooper et al, 1968;van Doorn and Stead, 1997;Michaeli et al, 1999;van Doorn, 2002;Blankenship and Dole, 2003;Malik et al, 2003;Beno-Moualem et al, 2004;Ascough et al, 2005;Roberts and Gonzáles-Carranza, 2007;Agusti et al, 2008;Goldental-Cohen et al, 2017).…”

Section: Introductionmentioning

confidence: 99%

Re-evaluation of the ethylene-dependent and -independent pathways in the regulation of floral and organ abscission

Meir

Philosoph‐Hadas

Riov

et al. 2019

Journal of Experimental Botany

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Number of figures: 1 Word count: Re-evaluation of the ethylene-dependent and-independent pathways in the regulation of organ abscission focusing on model plants of flower abscission Highlights: Ethylene is the key regulator of organ abscission, while the IDA-HAE-HSL2 pathway acts downstream of ethylene signaling. The involvement of the turgor pressure in the execution of abscission is suggested. .

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Section: Introductionmentioning

confidence: 99%

Re-evaluation of the ethylene-dependent and -independent pathways in the regulation of floral and organ abscission

Meir

Philosoph‐Hadas

Riov

et al. 2019

Journal of Experimental Botany

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“…Plant organ abscission is an element of the developmental strategy related to reproduction, defense mechanisms or disposal of unused organs [5,6]. In most species, the key players involved in activation of the abscission zone (AZ) are plant hormones, among which auxin (IAA) and ethylene (ET) play the key roles [7,8].…”

Section: Introductionmentioning

confidence: 99%

“…In most species, the key players involved in activation of the abscission zone (AZ) are plant hormones, among which auxin (IAA) and ethylene (ET) play the key roles [7,8]. An increased concentration of auxin in the distal region of pedicel (between the flower and the AZ), as compared to its concentration in the proximal region (between the AZ and the peduncle), is a prerequisite for organ abscission [5,6,9]. Our previous transcriptome-wide study [10] proved that the abscission of yellow lupine flowers and pods is associated, inter alia, with intensive changing of auxin catabolism and signaling.…”

Section: Introductionmentioning

confidence: 99%

“…Most siRNAs seem to play a marginal role in the processes studied herein, with the exception of tasiR-ARFs, which were DE in the developing flowers. The target genes of these miRNAs were predominantly categorized into the following Kyoto Encyclopedia of Genes and Genomes (KEGG) pathways: 'Metabolism' (15,856), 'Genetic information processing' (5,267), and 'Environmental information processing' (1,517). Over 700 putative targets were categorized as belonging to the 'Plant Hormone Signal Transduction pathway'.…”

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confidence: 99%

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Integrated analysis of small RNA, transcriptome and degradome sequencing provides new insights into floral development and abscission in yellow lupine (Lupines luteus L.)

Glazińska

Kulasek

Glinkowski

et al. 2019

Preprint

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Background Yellow lupine (Lupinus luteus L., Taper c.) is an important legume crop. However, its flower development and pod formation are often affected by excessive abscission. Organ detachment occurs within the abscission zone (AZ) and in L. luteus primarily affects flowers formed at the top of the inflorescence. The top flowers’ fate appears determined before anthesis. The organ development and abscission mechanisms utilize a complex molecular network, not yet not fully understood, especially as to the role of miRNAs and siRNAs. We aimed at identifying differentially expressed (DE) small ncRNAs in lupine by comparing small RNA-seq libraries generated from developing upper and lower raceme flowers, and flower pedicels with active and inactive AZs. Their target genes were also identified using transcriptome and degradome sequencing. Results Within all the libraries, 394 known and 28 novel miRNAs and 316 phased siRNAs were identified. In flowers at different stages of development, 30 miRNAs displayed DE in the upper and 29 in the lower parts of the raceme. In comparisons between upper and lower raceme flowers, a total of 46 DE miRNAs were identified. miR393 and miR160 were related to the upper and miR396 to the lower flowers and pedicels of non-abscising flowers. In flower pedicels we identified 34 DE miRNAs, with miR167 being the most abundant of all. Most siRNAs seem to play a marginal role in the processes studied herein, with the exception of tasiR-ARFs, which were DE in the developing flowers. The target genes of these miRNAs were predominantly categorized into the following Kyoto Encyclopedia of Genes and Genomes (KEGG) pathways: ‘Metabolism’ (15,856), ‘Genetic information processing’ (5,267), and ‘Environmental information processing’ (1,517). Over 700 putative targets were categorized as belonging to the ‘Plant Hormone Signal Transduction pathway’. 26,230 target genes exhibited Gene Ontology (GO) terms: 23,092 genes were categorized into the ‘Cellular component’, 23,501 into the ‘Molecular function’, and 22,939 into the ’Biological process’. Conclusion Our results indicate that miRNAs and siRNAs in yellow lupine may influence the development of flowers and, consequently, their fate by repressing their target genes, particularly those associated with the homeostasis of phytohormones, mainly auxins.

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“…Examples of flower drop in potted flowers include snapdragon, Begonia, bud drop in roses, calceolaria, geranium, corolla abscission of Streptocarpus hybridus and bracteole drop in bougainvillea (Halevy and Kofranek 1976;Agnew et al 1985;Gago et al 2001). Stressful environmental conditions such as temperature, humidity, low light, water stress, exposure to ethylene, ozone, incorrect packaging, and vibration during transport will often initiate and accelerate abscission (Ascough et al 2005).…”

Section: Introductionmentioning

confidence: 99%

Flower Abscission in Excised Inflorescences of Three Plectranthus Cultivars

et al. 2006

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Flower abscission induced by ethylene in three Plectranthus cultivars was investigated in order to characterise response to a range of inhibitory and antagonistic compounds. Excised inflorescences were exposed to 100 ml l À1 ethylene gas or placed in various concentrations of ethephon (277, 27.7, 2.77, 0.277 and 0.0277 lM). Flower abscission in Plectranthus was readily induced by applying ethylene gas and by the 277 lM dose of ethephon. Removal of the inflorescences from the ethylene treatment prevented subsequent flower abscission. This implies that ethylene treatment did not induce an autocatalytic production of ethylene. Compounds that are known to compete for the ethylene receptor (100 and 500 ppb 1-methylcyclopropene or 100 and 500 ppm 2,5-norbornadiene) did not reduce abscission in this system. Also, application of the ethylene biosynthesis inhibitor, aminooxyacetic acid at 1 mM, was ineffective at preventing ethylene-induced flower abscission. In contrast, one compound known to block protein production (100 lM cycloheximide) and a non-competitive inhibitor of ethylene action (2 mM silver thiosulfate) did prevent ethylene-induced abscission. We conclude that flower abscission in cut inflorescences of Plectranthus is very likely mediated by endogenous ethylene production, but that control of ethylene-induced flower abscission in this genus can not be readily obtained by most ethylene antagonists that are known to be effective in other systems.

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Flower abscission: environmental control, internal regulation and physiological responses of plants

Cited by 27 publications

References 165 publications

Re-evaluation of the ethylene-dependent and -independent pathways in the regulation of floral and organ abscission

Re-evaluation of the ethylene-dependent and -independent pathways in the regulation of floral and organ abscission

Integrated analysis of small RNA, transcriptome and degradome sequencing provides new insights into floral development and abscission in yellow lupine (Lupines luteus L.)

Flower Abscission in Excised Inflorescences of Three Plectranthus Cultivars

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