Post-Pollination Ovule Development in<i>Dendrobium</i>Orchids: III. Fine Structure of Meiotic Prophase I.

Israel, Herbert W.; Sagawa, Yoneo

doi:10.1080/00087114.1965.10796154

Cited by 29 publications

(9 citation statements)

References 24 publications

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“…Heslop-Harrison (1972) described a temporary suspension of RNA synthesis in the rneiocyte. Moreover, Newcomb (1973) in Helianthus annus and Isreal and Sagawa (1965) in Dendrobium reported lesser number of organelles in the early phases of meiosis, a factor which can be correlated with the decreased metabolic content. The meiocyte in Argemone mexicana is invested with a thick cell wall which stains intensely for PAS reaction.…”

Section: Discussionmentioning

confidence: 99%

Histochemical studies on the female gametophyte of Argemone mexicana L.

1980

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Section: Discussionmentioning

confidence: 99%

Histochemical studies on the female gametophyte of Argemone mexicana L.

1980

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“…Those studies which have been done on female meiosis in plants have been concerned mostly with megasporogenesis and embryo sac development at the light microscope level (9), or with cytoplasmic organelles and membrane systems at the electron microscope level (11,26,43). Consequently, with the exception of investigations like those on Lilium and Fritillaria (13), Tulbaghia (47), barley and rye (1, 2,8), the limited studies which have been done, offer little information on chromosome structure and behaviour inthe female meiocyte.…”

Section: Introductionmentioning

confidence: 99%

Ultrastructural analysis of female pachynema and the relationship between synaptonemal complex length and crossing-over in zea mays

Mogensen

1977

Carlsberg Res. Commun.

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-over in male and female flowersThe synaptonemal complexes at pachynema of megasporocytes and microsporocytes in a single genotype of maize were reconstructed from electron micrographs of serial sections. The structure of the synaptonemai complexes, the structure of centromeres and knobs, the continuity of the synaptonemal complex through centromeres and interstitial knobs, centromere fusion, knob fusion and the mode and amount of telomere attachment to the nuclear envelope are consistent features of female and male meiocytes. The absence of large vacuoles within the nucleoli of megasporocytes is the most conspicuous difference between the two types of meiocytes. The mean total synaptonemal complex length of three female nuclei was 413 ~m and not significantly different from total bivalent length in reconstructed male nuclei. The size of female and male pachytene nuclei was likewise similar.The plant studied carried a large terminal knob on the short arm of bivalent 9. According to RHOADES (42), the presence of this knob causes a sex difference in crossing-over in the short arm of bivalent 9, reducing the female crossing-over value between the genes C and Wx. The female synaptonemal complex length of the short arm of chromosome 9 was found to be 66% of that of the male. No significant sex difference in synaptonemal complex length was detectable for the long arm of chromosome 9 or for chromosome 6. It is proposed that the sex difference in crossing-over frequency is causally related to the difference in synaptonemai complex length.

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“…cells enlarge and transform directly into megasporocytes . Plasmodesmata are notably absent from its walls (Israel and Sagawa, 1965). As the cell approaches the first meiotic prophase, there is a significant increase in its volume and in the number of organelles.…”

Section: Megasporocytementioning

confidence: 99%

Orchid Biology

1997

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Post-Pollination Ovule Development inDendrobiumOrchids: III. Fine Structure of Meiotic Prophase I.

Cited by 29 publications

References 24 publications

Histochemical studies on the female gametophyte of Argemone mexicana L.

Histochemical studies on the female gametophyte of Argemone mexicana L.

Ultrastructural analysis of female pachynema and the relationship between synaptonemal complex length and crossing-over in zea mays

Orchid Biology

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