The effect of different genome and cytoplasm on meiotic pairing in maize newly synthetic polyploids
Journal: Euphytica February 2016, Volume 207, Issue 3, pp 593-603
Author: Mingjun Cheng, Mingmin Zheng, Shipeng YangAffiliated with Maize Research Institute, Sichuan Agricultural University , Yang Li, Xingchun Dong, Jing Li, Rulong Sun, Huaxiong Li, Shufeng Zhou and 3 more
Allopolyploidization plays the special role in the evolution of many crops. Moreover, the evolution in early stage of some allopolyploidization events is predicted to be effected by nuclear-cytoplasmic interactions. Maize and teosintes are well model system for study of genetic recombination in allopolyploidization. In order to investigate the effects of genome organization and cytoplasm on genome evolution in newly synthesized allopolyploids (neoallopolyploids), a series of neoallopolyploids were produced by reciprocal crosses of maize and Zea perennis. By using dual-color genomic in situ hybridization, intra- and intergenomic meiosis pairing of these polyploids were quantified and compared with regard to its genome organization and cytoplasm background. In the four neoallopolyploids, the stability of maize genome is consistently lower than that of Z. perennis genome. Additional, the stability of maize genome is affected by genome ploidy. The cytoplasm, genome composition and their interaction do have the special role in chromosome paring and the meiosis behaviors in Zea allopolyploids vary significantly and showed non-diploidization. Z. perennis cytoplasm may give a relatively relaxed environment for maize genome.