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Isolation and Properties of Nuclei from Control and Auxin-treated Soybean Hypocotyl
Author(s) -
Yih-Ming Chen,
Ching Yu Lin,
Hyo Ihl Chang,
Tom J. Guilfoyle,
Joe L. Key
Publication year - 1975
Publication title -
plant physiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.554
H-Index - 312
eISSN - 1532-2548
pISSN - 0032-0889
DOI - 10.1104/pp.56.1.78
Subject(s) - auxin , hypocotyl , rna , nucleolus , dna , nucleus , microbiology and biotechnology , biochemistry , rna polymerase , polymerase , biology , cell nucleus , chemistry , gene , botany
A quick procedure for the isolation of nuclei with good yield from soybean hypocotyl (Glycine max var. Wayne) was developed. The isolated nuclei appeared to retain their structural integrity. They were typically ellipsoidal with minima and maxima diameter of about 6 and 8 to 10 micrometers. While the nuclei were similar in size, the nucleoli were significantly larger in nuclei from auxin-treated tissue. The DNA content per nucleus was 4 +/- 1 picograms for both untreated and auxin-treated tissues. The DNA: RNA: protein ratio of isolated nuclei in untreated and auxin-treated tissues was 1: 3.1: 11 and 1: 5.4: 21.7, respectively. The purified nuclei were active in RNA synthesis; the level of RNA polymerase II activity expressed in the nuclei from untreated tissue was 50 to 60% higher than RNA polymerase. I. The nuclei from auxin-treated tissues contained about 2.5 times as much RNA polymerase I activity as nuclei from untreated tissue. The purified nuclei from both untreated and auxin-treated tissues were also active in the incorporation of (3)H-TTP into DNA.

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