A Case of Asyndesis in Picea Abies

Andersson, Enar

doi:10.1111/j.1601-5223.1947.tb02807.x

Cited by 40 publications

(6 citation statements)

References 37 publications

(8 reference statements)

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“…SAX, 1932; SAX and SAX, 1933; KNABEN, 1953;CHANDLER and MAVRODINEAU, 1965). Mostly no terminalization occurs, which agrees with the pattern of development described for Picea (ANDERSON, 1947) and Pseudotsuga (ZENKE, 1953). Therefore the appearance of the chromosomes during this stage is different from that in barley (EKBERG and ERIKSSON, 1965) and maize (RHOADES, 1950).…”

Section: % -Iieredilns 59supporting

confidence: 83%

Meiosis and Pollen Formation in Larix

2009

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Section: % -Iieredilns 59supporting

confidence: 83%

Meiosis and Pollen Formation in Larix

2009

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“…Lagging chromosomes (Fig. 5e) and other aberrations were similar to meiotic irregularities found in conifer tree pollen (Andersson 1947;Andersson et al 1969;Eriksson et al 1970;Jonsson 1974). Evidence for meiotic restitution and the formation of diploid androspores was not sought.…”

Section: Male Parthenogenetic Androsporogenesis and Dichogamymentioning

confidence: 86%

Female parthenogenetic apomixis and androsporogenesis in Douglas-fir embryonal initials in an artificial sporangium

Durzan

2011

Sex Plant Reprod

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Control of female parthenogenetic apomixis and androsporogenesis of Douglas-fir embryonal initials was studied using an experimental culture system in which changes in growth condition can mediate changes in cell identity and outcomes. This culture system constitutes an artificial sporangium in which myriad culture conditions can be simulated and should be applicable for research on a variety of gymnosperms. In this study, embryonal initials from developing seeds from two Douglas-fir trees were rescued and became reprogrammed for female parthenogenetic apomixis (fPA) and parthenogenetic androsporogenesis (mPA). Female PA was initiated by endomitosis forming a binucleate cell with a diploid egg-equivalent and an apoptotic ventral canal nucleus in an archegonial tube. Egg-equivalent nuclei formed cells (parthenotes) that were discharged into an aqueous culture medium. Parthenotes developed axial tiers atypical of early embryogenesis in seeds. Earlier in the year, androsporangial tubes were parthenogenetically differentiated and released monads, dyads, triads, and tetrads into the culture medium. Spores showed chromosomal aberrations. PA demonstrated a temporal separation in gender expression (dichogamy). Embryonal initials brought forward and by-passed the long juvenile phases normally needed for cells to develop into trees and express reproductive maturity. Expressions of fPA and mPA indicated that the specialized culture flasks served as an artificial sporangium (AS). Awareness is raised for the value of an AS for research in gymnosperm life cycles and as a teaching and research laboratory.

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“…It might well be that the Central European Norway spruce growing in Central Sweden was not adapted to the weather conditions in certain years. Thus, in the forties, in the pilot investigations of meiosis and pollen formation in Norway spruce and Scots pine, both genetically conditioned (ANDERSSON 1947a andb, 1954;RUNQVIST 1%8) and temperature-conditioned irregularities (ANDERSSON 1947a, b and c) were observed. Starting in 1948, these preliminary investigations were extended to comprise a number of populations of Picea abies in the vicinity ofthe timerline in Sweden, at Salen (lat.…”

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confidence: 98%

Temperature-conditioned irregularities in pollen mother cells of Picea abies (L.) Karst

Andersson

2009

Hereditas

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The meiosis in pollen mother cells of Picea abies from autochtonous stands on the highland slopes in northern Sweden was studied. Three stands from different altitudes in Austria were also included in this investigation. On the mountain slope within the Sälen area, Sweden, twigs were transferred from one altitude to another. In this way, the pollen mother cells were exposed to different temperatures. A temperature of ‐2°C seemed to be a threshold temperature above which no induction of irregularities took place. The data obtained suggested that the amount of damage increased with decreasing temperature, resulting in a complete collapse of the meiotic division at approximately ‐10°C. The stages diakinesis—anaphase I and metaphase II—telophase II were found to be the most sensitive ones.

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A Case of Asyndesis in Picea Abies

Cited by 40 publications

References 37 publications

Meiosis and Pollen Formation in Larix

Meiosis and Pollen Formation in Larix

Female parthenogenetic apomixis and androsporogenesis in Douglas-fir embryonal initials in an artificial sporangium

Temperature-conditioned irregularities in pollen mother cells of Picea abies (L.) Karst

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