RICE SCIENCE ›› 2008, Vol. 15 ›› Issue (3): 161-165 .

• Research Paper •     Next Articles

Molecular-Cytological Identification and Chromosome Behavior Analysis of Telotetrasomic in Rice

GONG Zhi-yun; GAO Qing-song; YU Heng-xiu; YI Chuan-deng; GU Ming-hong   

  1. Key Laboratory of Crop Genetics and Physiology of Jiangsu Province/Key Laboratory of Plant Functional Genomics, Ministry of Education, Yangzhou University, Yangzhou 225009, China
  • Received:2008-07-26 Online:2008-09-28 Published:2008-09-28
  • Contact: GU Ming-hong
  • Supported by:
    the National Natural Science Foundation of China (Grant No. 30600345, No. 30770131 and No. 30771210).

Abstract: From the progenies of a telotrisomic of chromosome 9 short arm of an indica rice variety, Zhongxian 3037, a phenotypical variant was selected. The variant plant had rolled leaves, dispersed plant type, as well as a low seed-setting rate. Cytological and molecular cytological investigations revealed two extra chromosomes, which were the shortest in somatic cells of the variant. Fluorescent in situ hybridization (FISH) analysis using a rice centromere specific DNA (RCS2) and a DNA sequence specific for chromosome 9 on premetaphase and pachytene chromosomes showed that these two chromosomes were the short arms of chromosome 9. That is to say, the variant was a telotetrasomic of chromosome 9. Among the 25 pachytene cells, the two telosomic chromosomes paired each other to form a bivalent and didn’t pair with other normal chromosome 9 as multivalents in 96% cells. However, the bivalent was easy to disassociate in advance.

Key words: rice, telotetrasomic, meiosis, fluorescent in situ hybridization, molecular cytology, chromosome beh