It is a matter of timing: asynchrony during pollen development and its consequences on pollen performance in angiosperms-a review.
Functional pollen is needed to successfully complete fertilization. Pollen is formed inside the anthers following a specific sequence of developmental stages, from microsporocyte meiosis to pollen release, that concerns microsporocytes/microspores and anther wall tissues. The processes involved may...
| Published in: | Protoplasma Vol. 254; no. 1; pp. 57 - 74 |
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| Main Authors: | , , |
| Format: | Journal Article |
| Published: |
Springer Nature
Jan2017
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| Online Access: | View this record in EBSCOhost |
| fields | @attributes: recordID: 1 pdfLink: plink: https://search.ebscohost.com/login.aspx?direct=true&db=ccm&AN=120569761&site=ehost-live header: @attributes: shortDbName: ccm uiTerm: 120569761 longDbName: CINAHL Complete uiTag: AN controlInfo: bkinfo: dissinfo: jinfo: jid: 0033183X 2CF jtl: Protoplasma issn: 0033183X maglogo: N pubinfo: dt: Jan2017 vid: 254 iid: 1 pid: 237 pub: Springer Nature place: New York, New York artinfo: ui: 120569761 10.1007/s00709-016-0950-6 120569761 ppf: 57 ppct: 17 formats: fmt: @attributes: type: P tig: atl: It is a matter of timing: asynchrony during pollen development and its consequences on pollen performance in angiosperms-a review. aug: au: Carrizo García, Carolina Nepi, Massimo Pacini, Ettore affil: Instituto Multidisciplinario de Biología Vegetal (CONICET-UNC) , Córdoba Argentina sug: ab: Functional pollen is needed to successfully complete fertilization. Pollen is formed inside the anthers following a specific sequence of developmental stages, from microsporocyte meiosis to pollen release, that concerns microsporocytes/microspores and anther wall tissues. The processes involved may not be synchronous within a flower, an anther, and even a microsporangium. Asynchrony has been barely analyzed, and its biological consequences have not been yet assessed. In this review, different processes of pollen development and lifetime, stressing on the possible consequences of their differential timing on pollen performance, are summarized. Development is usually synchronized until microsporocyte meiosis I (occasionally until meiosis II). Afterwards, a period of mostly asynchronous events extends up to anther opening as regards: (1) meiosis II (sometimes); (2) microspore vacuolization and later reduction of vacuoles; (3) amylogenesis, amylolysis, and carbohydrate inter-conversion; (4) the first haploid mitosis; and (5) intine formation. Asynchrony would promote metabolic differences among developing microspores and therefore physiologically heterogeneous pollen grains within a single microsporangium. Asynchrony would increase the effect of competition for resources during development and pollen tube growth and also for water during (re)hydration on the stigma. The differences generated by developmental asynchronies may have an adaptive role since more efficient pollen grains would be selected with regard to homeostasis, desiccation tolerance, resilience, speed of (re)hydration, and germination. The performance of each pollen grain which landed onto the stigma will be the result of a series of selective steps determined by its development, physiological state at maturity, and successive environmental constrains. pubtype: Academic Journal doctype: Journal Article ougenre: Article language: English refInfo: holdings: @attributes: islocal: N |
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