A GENETIC-ANALYSIS OF A TOMATO (LYCOPERSICON-ESCULENTUM) GENOTYPE WITH A HIGH-FREQUENCY OF TWIN SPOTS
文献类型: 外文期刊
第一作者: ZHU, D
作者: ZHU, D;SCHOENMAKERS, HCH;WOLTERS, AMA;KOORNNEEF, M
作者机构:
关键词: GENETIC INSTABILITY;SOMACLONAL VARIATION;TWIN SPOTS;LYCOPERSICON ESCULENTUM;TOMATO
期刊名称:THEORETICAL AND APPLIED GENETICS ( 影响因子:5.699; 五年影响因子:5.565 )
ISSN: 0040-5752
年卷期: 1995 年 91 卷 6-7 期
页码:
收录情况: SCI
摘要: Among pale-green tomato plants heterozygous for the xanthophyllic 2 (xa-2) mutation that were transformed with a T-DNA harbouring the NPTII and GUS gene, a plant with a high frequency of green/white twin spots was found. The genetic analysis of this plant indicated that the occurrence of these twin spots was caused by a genetic defect located at the distal end of chromosome 10S, where xa-2 also is located. The genetic analysis of green plants regenerated from leaf explants of this twin-spot plant revealed that the green sectors derive from non-disjunction of the xa-2(+) allele. In an analysis of mitotic chromosome behaviour bridges were observed in approximately 5% of the anaphases, providing arguments that a breakage-fusion-bridge-cycle caused by a tissue culture-induced genomic instability is the most likely cause of this aberrant behaviour of chromosome 10.
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