title: Development of photoperiod- and thermo-sensitive male sterility rice expressing transgene Bacillus thuringiensis.
abstract: Stem borers and leaffolders are the main pests that cause severe damage in rice (Oryza sativa L.) production worldwide. We developed the first photoperiod- and thermo-sensitive male sterility (PTSMS) rice 208S with the cry1Ab/1Ac Bacillus thuringiensis (Bt) gene, through sexual crossing with Huahui 1 (elite line with the cry1Ab/1Ac gene). The novel 208S and its hybrids presented high and stable resistance to stem borers and leaffolders, and the content of Cry1Ab/1Ac protein in chlorophyllous tissues achieved the identical level as donor and showed little accumulation in non-chlorophyllous tissue. No dominant dosage effect in the Bt gene was observed in 208S and its derived hybrids. An analysis of fertility transition traits indicated that 208S was completely sterile under long day length/high temperature, but partially fertile under short day length/low temperature. With fine grain quality and favorable combining ability, 208S had no observed negative effects on fertility and agronomic traits from Bt (cry1Ab/1Ac). Additionally, 208S as a male sterile line showed no fertility decrease caused by Bt transgenic process, as it is the case in Huahui 1. Thus, 208S has great application value in two-line hybrid production for insect resistance, and can also be used as a bridge material in rice Bt transgenic breeding.
authors.affiliation: Institute of Crop Science, College of Agriculture and Biotechnology, Zhejiang University , Yuhangtang Road 866, Hangzhou, 310058 , China.
authors.forename: Xin
authors.initials: X
authors.lastname: Liu
authors.affiliation: Institute of Crop Science, College of Agriculture and Biotechnology, Zhejiang University , Yuhangtang Road 866, Hangzhou, 310058 , China.
authors.forename: Jiwen
authors.initials: J
authors.lastname: Zhang
authors.affiliation: Institute of Crop Science, College of Agriculture and Biotechnology, Zhejiang University , Yuhangtang Road 866, Hangzhou, 310058 , China.
authors.forename: Cuicui
authors.initials: C
authors.lastname: Zhang
authors.affiliation: Institute of Crop Science, College of Agriculture and Biotechnology, Zhejiang University , Yuhangtang Road 866, Hangzhou, 310058 , China.
authors.forename: Liangchao
authors.initials: L
authors.lastname: Wang
authors.affiliation: Institute of Crop Science, College of Agriculture and Biotechnology, Zhejiang University , Yuhangtang Road 866, Hangzhou, 310058 , China.
authors.forename: Hao
authors.initials: H
authors.lastname: Chen
authors.affiliation: Institute of Insect Sciences, College of Agriculture and Biotechnology, Zhejiang University , Yuhangtang Road 866, Hangzhou, 310058 , China.
authors.forename: Zengrong
authors.initials: Z
authors.lastname: Zhu
authors.affiliation: Institute of Crop Science, College of Agriculture and Biotechnology, Zhejiang University , Yuhangtang Road 866, Hangzhou, 310058 , China.
authors.forename: Jumin
authors.initials: J
authors.lastname: Tu
keywords: cry1Ab/1Ac; dosage effect; insect resistance; photoperiod- and thermo-sensitive male sterility; rice (Oryza sativa L.); transgenic breeding; two-line hybrid