Cell Death of Self-Incompatible Pollen Tubes: Necrosis or Apoptosis?

Geitmann, Anja

doi:10.1007/978-3-642-59969-9_10

Cited by 11 publications

(13 citation statements)

References 107 publications

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“…Incompatible pollen tubes in this species were found to rupture. 44 The outer, pectinaceous pollen tube cell wall thickens in this and other species. 75,76 We did not observe these phenomena in incompatible poppy pollen tubes.…”

Section: Ultrastructural Changes In Other Si Systemsmentioning

confidence: 80%

“…70 Callose deposition is also present on the wall of the pollen mother cell in cytoplasmic male sterile lines of common bean. 71 In self-incompatible Self-incompatibility in Papaver rhoeas pollen may involve a type of PCD A Geitmann et al pollen tubes, aberrant or increased callose deposition seems to be typical not only for poppy but also for other species (see Geitmann, 44 Geitmann et al 72 and Pacini 73 and references therein). However, the phenomenon is unlikely to be a cell death specific process but is rather a more general side effect, as already suggested previously.…”

Section: Callose Depositionmentioning

confidence: 99%

“…However, the phenomenon is unlikely to be a cell death specific process but is rather a more general side effect, as already suggested previously. 44 It is likely that callose production is a pathway that is not easily disturbed and that, if maintained in cells in which the normally extremely fast growth is inhibited, results in huge depositions of the polysaccharide. Interestingly enough, our ultrastructural study showed that callose deposition continues far beyond the point of time when Golgi bodies have become undistinguishable, thus indicating that the membrane located callose synthases remain active for extended periods of time.…”

Section: Callose Depositionmentioning

confidence: 99%

“…75,76 We did not observe these phenomena in incompatible poppy pollen tubes. The observation that stigmatic S-RNases elicit very slow inhibition of pollen tube growth that takes many hours, indicates that cell death in Solanaceae is a nonprogrammed necrotic event subsequent to RNA degradation (see Geitmann 44 for a detailed discussion). Other plant families, such as the Liliaceae and the Brassicaceae, show different biochemical mechanisms, neither of which appear to be based on PCD.…”

Section: Ultrastructural Changes In Other Si Systemsmentioning

confidence: 99%

“…8,43 The process of pollen rejection in SI is a good system in which to study cell death in plants, as along with a variety of species-specific incompatibility processes, there is a range of different ways to die for these unsuccessful pollen. 44 Although there is circumstantial evidence that PCD may be operating during SI in P. rhoeas, DNA fragmentation alone is not a sufficient criterion for identifying PCD. In order to explore the possibility of PCD stimulation during the SI response further, we have investigated whether any of the cellular changes associated with SI in pollen tubes are characteristic for this type of cell death.…”

Section: Introductionmentioning

confidence: 99%

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The self-incompatibility response in Papaver rhoeas pollen causes early and striking alterations to organelles

2004

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Self-incompatibility (SI) in Papaver rhoeas is accompanied by a cascade of signalling events that result in the rapid arrest and eventual death of the pollen tube. We have used rapid freeze fixation, freeze substitution and transmission electron microscopy to provide the first description of changes to pollen at the ultrastructural level during SI in this species. Our studies reveal that dramatic alterations to the morphology of mitochondria, Golgi bodies and ER occur within 1 h of SI induction. Similar symptoms have also been observed during programmed cell death (PCD) in some cell types. These include: the conspicuous condensation of the vegetative and generative nuclei, the swelling and loss of cristae in mitochondria and the disappearance of Golgi bodies. Some of the early alterations to the mitochondria and Golgi bodies observed at 1 h, almost certainly occur when cells are still alive. Other events, such as nuclear condensation, occur later and coincide with DNA fragmentation and the loss of cell viability. Our observations suggest that the SI response in P. rhoeas pollen may potentially involve a type of PCD.

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Section: Ultrastructural Changes In Other Si Systemsmentioning

confidence: 80%

Section: Callose Depositionmentioning

confidence: 99%

Section: Callose Depositionmentioning

confidence: 99%

Section: Ultrastructural Changes In Other Si Systemsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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The self-incompatibility response in Papaver rhoeas pollen causes early and striking alterations to organelles

2004

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Self-incompatibility, Inbreeding Depression, and Potential to Develop Inbred Lines in Alfalfa

Parajuli

Peel

et al. 2021

The Alfalfa Genome

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Alfalfa (Medicago sativa L.) is a perennial, outcrossing legume crop predominantly grown for hay, silage, or pasture. Intensive selection has resulted in dramatic improvement in fitness traits, including winter survival and disease resistance. However, there has been minimal improvement in other economically important traits, such as hay yield, which is still comparable to 30 years ago. Intensive phenotyping costs on this type of trait hinder high selection pressure to identify superior outcross individuals. Severe inbreeding depression inhibits the development of inbred lines with accumulated favorable alleles that exhibit heterosis. This review highlights the outcomes of inbreeding depression as well as the causes, including unmasking deleterious alleles and triggering self-incompatibility. We tracked the research efforts that unveil the genetic bases underlying deleterious alleles and self-incompatibility. The magnitudes of inbreeding depression were compared with the rate of heterozygous halved time in diploid and tetraploid organisms. To fill in the gaps between the controversy and existing hypotheses, we theorized a dosage dominant model of inheritance. The dosage dominant model is similar to the Mendelian dominance model, in which a genotype exhibits a dominant phenotype if there is a dominant allele (alphabet dominant). The difference is that in the dosage dominant model, a genotype will result in a dominant phenotype if the number of dominant alleles is equal to or greater than the number of recessive alleles. This review also includes a discussion on the development of pseudo inbreds and a hypothesis to identify deleterious alleles using bulked segregant analysis and consequently to purge deleterious alleles using marker-assisted selection, to progress toward the successful development of pure inbred lines in alfalfa.

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Incompatibility and Incongruity in Wild and Cultivated Plants

Nettancourt

2001

659

524

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Cell Death of Self-Incompatible Pollen Tubes: Necrosis or Apoptosis?

Cited by 11 publications

References 107 publications

The self-incompatibility response in Papaver rhoeas pollen causes early and striking alterations to organelles

The self-incompatibility response in Papaver rhoeas pollen causes early and striking alterations to organelles

Self-incompatibility, Inbreeding Depression, and Potential to Develop Inbred Lines in Alfalfa

Incompatibility and Incongruity in Wild and Cultivated Plants

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