Haploid Angiosperms

Kimber, G.; Riley, Ralph

doi:10.1007/bf02860814

Cited by 214 publications

(70 citation statements)

References 135 publications

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“…Microspores are initially destined to develop into pollen grains but can be reprogrammed to behave like a zygote, thus, developing into a haploid embryo (Kimber and Riley 1963). The production of doubled-haploid (DH) plants is a useful tool for breeding in many crop species (Devaux and Pickering 2005), and has generated a number of commercial cultivars (Devaux et al 1996;Szarejko 2003).…”

Section: Introductionmentioning

confidence: 99%

Microspore embryogenesis in barley: anther pre-treatment stimulates plant defence gene expression

Jacquard

Mazeyrat-Gourbeyre

Devaux³

et al. 2008

Planta

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Microspore embryogenesis (ME) is a process in which the gametophytic pollen programme of the microspore is reorientated towards a new embryo sporophytic programme. This process requires a stress treatment, usually performed in the anther or isolated microspores for several days. Despite the universal use of stress to induce ME, very few studies have addressed the physiological processes that occur in the anther during this step. To further understand the processes triggered by stress treatment, we followed the response of anthers by measuring the expression of stressrelated genes in two barley (Hordeum vulgare L.) cultivars differing in their ME response. Genes encoding enzymes involved in oxidative stress (glutathione-S-transferase, GST; oxalate oxidase, OxO), in the synthesis of jasmonic acid (13-lipoxygenase, Lox; allene oxide cyclase, AOC; allene oxide synthase, AOS) and in the phenylpropanoid pathway (phenylalanine ammonia lyase, PAL), as well as those encoding PR proteins (Barwin, chitinase 2b, Chit 2b; glucanase, Gluc; basic pathogenesis-related protein 1, PR1; pathogenesis-related protein 10, PR10) were up-regulated in whole anthers upon stress treatment, indicating that anther perceives stress and reacts by triggering general plant defence mechanisms. In particular, both OxO and Chit 2b genes are good markers of anther reactivity owing to their high level of induction during the stress treatment. The effect of copper sulphate appeared to limit the expression of defence-related genes, which may be correlated with its positive effect on the yield of microspore embryos.

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Section: Introductionmentioning

confidence: 99%

Microspore embryogenesis in barley: anther pre-treatment stimulates plant defence gene expression

Jacquard

Mazeyrat-Gourbeyre

Devaux³

et al. 2008

Planta

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“…Observations on meiotic chromosome behaviour of haploids have mainly been restricted to metaphase I and later stages (for reviews, see Kimber & Riley, 1963;Magoon & Khanna, 1963;Sadasivaiah, 1974). A common feature of different monoploids is the presence of associations of two or more chromosomes in metaphase I cells.…”

Section: Introductionmentioning

confidence: 99%

Meiosis in haploid rye: extensive synapsis and low chiasma frequency

1994

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Extensive synaptonemal complex formation was found at prophase I in whole mount spread preparations of a spontaneous haploid rye, Secale cereale, with values of up to 87.8 per cent of the chromosome complement synapsed. Pairing-partner switches were frequent, giving rise to multiple associations in which all or most of the chromosomes were involved. However, the distribution of synaptonemal complex stretches suggests that synapsis does not occur at random. The frequency of multivalents and the mean frequency of bonded arms at metaphase I were 0.03 and 0.39, respectively. Associations between chromosome arms without heterochromatin were more frequent than between the remaining arms. The observation of recombinant chromosomes for telomeric C-bands at anaphase I indicates that metaphase I bonds are true chiasmata. The correspondence between the location of pairing initiation sites and chiasmata indicates that early synapsis could be confined to homologous regions.

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“…For the organelles, such new cytonuclear associations could act as a bridge between two distinct host species provided two conditions are met: (i) the haploids produced must be fertile; and (ii) the haploids produced must be males (otherwise their plastids will not be transmitted further). In the genus Actinidia, there have already been reports of haploids following manual interspecific hybridization (Chat et al 1996), in line with the observation that polyploid species are particularly prone to producing haploids (Kimber & Riley 1963). In addition, the production of unreduced gametes (Chat et al 1996;Yan et al 1997) or the spontaneous somatic doubling of the chromosomes (Chalak & Legave 1997) observed in Actinidia could restore the fertility of the haploids.…”

Section: Discussionmentioning

confidence: 83%

A one–step organelle capture: gynogenetic kiwifruits with paternal chloroplasts

Chat

Decroocq

Petit³

2003

Proc. R. Soc. Lond. B

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Androgenesis, the development of a haploid embryo from a male nucleus, has been shown to result in the instantaneous uncoupling of the transmission of the organelle and nuclear genomes (with the nuclear genome originating from the male parent only and the organelle genomes from the female parent). We report, for the first time, uncoupling resulting from gynogenesis, in Actinidia deliciosa (kiwifruit), a plant species known for its paternal mode of chloroplast inheritance. After pollen irradiation, transmission of nuclear genes from the pollen parent to the progeny was inhibited, but transmission of the chloroplast genome was not. This demonstrates that plastids can be discharged from the pollen tube into the egg with little or no concomitant transmission of paternal nuclear genes. Such events of opposite inheritance of the organelle and nuclear genomes must be very rare in nature and are unlikely to endanger the longterm stability of the association between the different genomes of the cell. However, they could lead to incongruences between organelle gene trees and species trees and may constitute an alternative to the hybridization/introgression scenario commonly invoked to account for such incongruences.

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Haploid Angiosperms

Cited by 214 publications

References 135 publications

Microspore embryogenesis in barley: anther pre-treatment stimulates plant defence gene expression

Microspore embryogenesis in barley: anther pre-treatment stimulates plant defence gene expression

Meiosis in haploid rye: extensive synapsis and low chiasma frequency

A one–step organelle capture: gynogenetic kiwifruits with paternal chloroplasts

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