Mitotic Senescence in Plants

Gan, Susheng

doi:10.1002/9780470988855.ch1

Cited by 11 publications

(12 citation statements)

References 29 publications

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“…Pathogen infection is known to accelerate the initiation and progression of leaf senescence (Gan, 2007). Leaf senescence is defined as the age-dependent deterioration process at the organ level that is associated with programmed cell death (Lim et al, 2007a).…”

Section: Xopd Suppresses Chlorophyll Loss and Alters Senescence-and Dmentioning

confidence: 99%

“…First, we monitored chlorophyll levels because chlorophyll degradation is an integral part of tissue senescence that reflects physiological and biochemical changes associated with nutrient recycling (Gan, 2007). Tomato leaves infiltrated with 10 mM MgCl 2 slowly lost chlorophyll over the course of 10 d, demonstrating the rate of chlorophyll degradation in uninfected tissue.…”

Section: Xopd Suppresses Chlorophyll Loss and Alters Senescence-and Dmentioning

confidence: 99%

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XopD SUMO Protease Affects Host Transcription, Promotes Pathogen Growth, and Delays Symptom Development inXanthomonas-Infected Tomato Leaves

et al. 2008

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We demonstrate that XopD, a type III effector from Xanthomonas campestris pathovar vesicatoria (Xcv), suppresses symptom production during the late stages of infection in susceptible tomato (Solanum lycopersicum) leaves. XopD-dependent delay of tissue degeneration correlates with reduced chlorophyll loss, reduced salicylic acid levels, and changes in the mRNA abundance of senescence- and defense-associated genes despite high pathogen titers. Subsequent structure-function analyses led to the discovery that XopD is a DNA binding protein that alters host transcription. XopD contains a putative helix-loop-helix domain required for DNA binding and two conserved ERF-associated amphiphilic motifs required to repress salicylic acid– and jasmonic acid–induced gene transcription in planta. Taken together, these data reveal that XopD is a unique virulence factor in Xcv that alters host transcription, promotes pathogen multiplication, and delays the onset of leaf chlorosis and necrosis.

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Section: Xopd Suppresses Chlorophyll Loss and Alters Senescence-and Dmentioning

confidence: 99%

Section: Xopd Suppresses Chlorophyll Loss and Alters Senescence-and Dmentioning

confidence: 99%

XopD SUMO Protease Affects Host Transcription, Promotes Pathogen Growth, and Delays Symptom Development inXanthomonas-Infected Tomato Leaves

et al. 2008

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“…Senescence of plant organs is a highly ordered developmental program that eventually leads to death, while enabling nutrient recycling (Reape and McCabe, 2008). Senescence in plants has been extensively studied in vegetative organs, mainly in leaves, and in reproductive organs, especially in petals (Gan, 2007). Microarray-based transcript profiling studies have led to the identification of genes with potential roles in the regulation and execution of senescence (Guo et al, 2004;Buchanan-Wollaston et al, 2005;van der Graaff et al, 2006;Wagstaff et al, 2009), and enhancer trap lines (He et al, 2001) and microarray analyses (Wagstaff et al, 2009) have identified genes induced during leaf senescence that are also expressed in senescent flowers, stems, and siliques, showing that most of the senescence-associated genes (SAGs) are not tissue specific.…”

mentioning

confidence: 99%

A Fertilization-Independent Developmental Program Triggers Partial Fruit Development and Senescence Processes in Pistils of Arabidopsis

et al. 2010

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The pistil is the specialized plant organ that enables appropriate pollination and ovule fertilization, after which it undergoes growth and differentiation to become a fruit. However, in most species, if ovules are not fertilized around anthesis the pistil irreversibly loses its growth capacity. We used physiological, molecular, and transcriptomic tools to characterize the postanthesis development of the unfertilized Arabidopsis (Arabidopsis thaliana) pistil. Surprisingly, developmental processes that have been previously described in developing Arabidopsis fruits, such as the collapse of the adaxial epidermis, differentiation of a sclerenchyma layer in the adaxial subepidermis and the dehiscence zone, and valve dehiscence, were also observed in the unfertilized pistil. We determined that senescence is first established in the transmitting tract, stigma, and ovules immediately after anthesis, and that the timing of senescence in the stigma and ovules correlates with the loss of fruit-set responsiveness of the pistil to pollen and the hormone gibberellin (GA), respectively. Moreover, we showed that mutants with altered ovule development have impaired fruit-set response to the GA gibberellic acid, which further indicates that the presence of viable ovules is required for fruit-set responsiveness to GAs in the unfertilized pistil. Our data suggest that a fertilizationindependent developmental program controls many of the processes during post-anthesis development, both in unfertilized pistils and seeded fruits, and point to a key role of the ovule in the capacity of pistils to undergo fruit set in response to GA.

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“…Breakdown of chlorophyll (Chl) is a visual hallmark of leaf senescence [1][2][3]. Non-fluorescent Chl-catabolites (NCCs) occur in leaves of various higher plants as characteristic colorless, tetrapyrrolic degradation products of Chl [4][5][6].…”

Section: Introductionmentioning

confidence: 99%

A novel blue fluorescent chlorophyll catabolite accumulates in senescent leaves of the peace lily and indicates a split path of chlorophyll breakdown

Kräutler¹,

Banala²,

Moser³

et al. 2010

FEBS Letters

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a b s t r a c tColorless, non-fluorescent Chl-catabolites (NCCs) are the typical, ubiquitous products of chlorophyll (Chl)-breakdown in senescent leaves. However, a fluorescent Chl-catabolite (FCC) accumulated in de-greened leaves of Spathiphyllum wallisii (Peace Lily), which showed a weak blue luminescence. The FCC, named Sw-FCC-62, was 'hypermodified' with an unprecedented 6-(2-[3,4-dihydroxy-phenyl]-ethyl)-b-glucopyranosidyl ester at the propionyl group. Such esters stabilize FCCs against their typical and rapid, spontaneous isomerization to NCCs. Chl-breakdown in Sp. wallisii thus branches off from the 'common' path in leaves, and furnishes unique and 'persistent' FCCs. Our findings on 'hypermodified' FCCs also call for attention as to possible physiological roles of Chl-catabolites in plants.

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Mitotic Senescence in Plants

Cited by 11 publications

References 29 publications

XopD SUMO Protease Affects Host Transcription, Promotes Pathogen Growth, and Delays Symptom Development inXanthomonas-Infected Tomato Leaves

XopD SUMO Protease Affects Host Transcription, Promotes Pathogen Growth, and Delays Symptom Development inXanthomonas-Infected Tomato Leaves

A Fertilization-Independent Developmental Program Triggers Partial Fruit Development and Senescence Processes in Pistils of Arabidopsis

A novel blue fluorescent chlorophyll catabolite accumulates in senescent leaves of the peace lily and indicates a split path of chlorophyll breakdown

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