title: [The factors of improving rice transformation efficiency].
abstract: The factors influencing the rice transformation frequency have been investigated by using 8 indica and japonica rice cultivars during the transformation procedures, such as induction of calli, selection, and regeneration. The following is the results: The immature embryos were pretreated in 4 degrees C for 4 or 7 days before inoculation, and the regeneration frequency of calli would be increased. High osmotic treatment may increase the possibility of transformation, especially for calli of 6 months or older. The transformation frequency was improved when selection pressure was removed during differentiation period. The V-type selection may be better than the normal selection. There is a difference of differentiation ability among the calli of three periods and it is found that the calli of two or three months are the best for transformation. Proline and DMSO can decrease browning rate of calli.
authors.affiliation: Institute of Genetics, Chinese Academy of Sciences, Beijing 100101, China. yesongqing@yahoo.com
authors.forename: S Q
authors.initials: SQ
authors.lastname: Ye
authors.forename: C C
authors.initials: CC
authors.lastname: Chu
authors.forename: S Y
authors.initials: SY
authors.lastname: Cao
authors.forename: Z S
authors.initials: ZS
authors.lastname: Tang
authors.forename: L
authors.initials: L
authors.lastname: Wang
authors.forename: S M
authors.initials: SM
authors.lastname: Zhao
authors.forename: W Z
authors.initials: WZ
authors.lastname: Tian
mesh_terms: D004121:Dimethyl Sulfoxide / Q000494:pharmacology; D012275:Oryza / Q000235:genetics*; D009997:Osmotic Pressure; D011392:Proline / Q000494:pharmacology; D014170:Transformation, Genetic
chemical_list: D011392:Proline; D004121:Dimethyl Sulfoxide