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Title: Flow sorting of the Y sex chromosome in the dioecious plant Melandrium album

Abstract

The preparation of stable chromosome suspensions and flow cytometric sorting of both the Y sex chromosome of the white campion, Melandrium album, and the deleted Y chromosome of an asexual mutant, 5K63, is described. The principle has been to maintain transformed roots in vitro, synchronize and block mitosis, reduce cells to protoplasts, and lyse these to release chromosomes. Such in vitro material, unlike many cell suspensions, showed a stable karyotype. Factors critical to producing high-quality chromosome suspensions from protoplasts include osmolality of isolation solutions and choice of spindle toxin and of lysis buffer. Agrobacterium rhizogenes transformed young growing root cultures were synchronized at G1/S with 50 {mu}M aphidicolin for 24 h and released to a mitotic block with 30 {mu}M oryzalin for 11 h. Protoplast preparations from such tissue routinely had metaphase indices reaching 15%. Suspensions of intact metaphase chromosomes, with few chromatids, were obtained by lysing swollen mitotic protoplasts in a citric acid/disodium phosphate buffer. Except for the presence of clumps of autosomal chromosomes near the X and Y chromosome zones, monoparametric histograms of fluorescence intensities of suspensions stained with 4{prime},6-diamidino-2-phenylindole showed profiles similar to theoretical flow karyotypes. Two types of Y chromosomes, one full-length and one partially deletedmore » (from the asexual mutant), could be sorted at 90% purity (21-fold enrichment of Y). These results are discussed in the context of sex determination and differentiation in higher plants. 45 refs., 6 figs., 2 tabs.« less

Authors:
; ;  [1]
  1. Free Univ. of Brussels (Belgium); and others
Publication Date:
Sponsoring Org.:
USDOE
OSTI Identifier:
456824
Resource Type:
Journal Article
Journal Name:
Cytometry
Additional Journal Information:
Journal Volume: 21; Journal Issue: 4; Other Information: PBD: 1 Dec 1995
Country of Publication:
United States
Language:
English
Subject:
55 BIOLOGY AND MEDICINE, BASIC STUDIES; Y CHROMOSOME; DNA SEQUENCING; CHROMOSOME SORTING; GENETIC MAPPING; CHROMOSOMAL ABERRATIONS; PLANT CELLS; KARYOTYPE; LYSIS; MITOSIS; CELL FLOW SYSTEMS; CHROMATIDS; FLUORESCENCE; MUTANTS

Citation Formats

Veuskens, J, Jacobs, M, and Negrutiu, I. Flow sorting of the Y sex chromosome in the dioecious plant Melandrium album. United States: N. p., 1995. Web. doi:10.1002/cyto.990210408.
Veuskens, J, Jacobs, M, & Negrutiu, I. Flow sorting of the Y sex chromosome in the dioecious plant Melandrium album. United States. https://doi.org/10.1002/cyto.990210408
Veuskens, J, Jacobs, M, and Negrutiu, I. 1995. "Flow sorting of the Y sex chromosome in the dioecious plant Melandrium album". United States. https://doi.org/10.1002/cyto.990210408.
@article{osti_456824,
title = {Flow sorting of the Y sex chromosome in the dioecious plant Melandrium album},
author = {Veuskens, J and Jacobs, M and Negrutiu, I},
abstractNote = {The preparation of stable chromosome suspensions and flow cytometric sorting of both the Y sex chromosome of the white campion, Melandrium album, and the deleted Y chromosome of an asexual mutant, 5K63, is described. The principle has been to maintain transformed roots in vitro, synchronize and block mitosis, reduce cells to protoplasts, and lyse these to release chromosomes. Such in vitro material, unlike many cell suspensions, showed a stable karyotype. Factors critical to producing high-quality chromosome suspensions from protoplasts include osmolality of isolation solutions and choice of spindle toxin and of lysis buffer. Agrobacterium rhizogenes transformed young growing root cultures were synchronized at G1/S with 50 {mu}M aphidicolin for 24 h and released to a mitotic block with 30 {mu}M oryzalin for 11 h. Protoplast preparations from such tissue routinely had metaphase indices reaching 15%. Suspensions of intact metaphase chromosomes, with few chromatids, were obtained by lysing swollen mitotic protoplasts in a citric acid/disodium phosphate buffer. Except for the presence of clumps of autosomal chromosomes near the X and Y chromosome zones, monoparametric histograms of fluorescence intensities of suspensions stained with 4{prime},6-diamidino-2-phenylindole showed profiles similar to theoretical flow karyotypes. Two types of Y chromosomes, one full-length and one partially deleted (from the asexual mutant), could be sorted at 90% purity (21-fold enrichment of Y). These results are discussed in the context of sex determination and differentiation in higher plants. 45 refs., 6 figs., 2 tabs.},
doi = {10.1002/cyto.990210408},
url = {https://www.osti.gov/biblio/456824}, journal = {Cytometry},
number = 4,
volume = 21,
place = {United States},
year = {Fri Dec 01 00:00:00 EST 1995},
month = {Fri Dec 01 00:00:00 EST 1995}
}