المؤلفون: Zhang, Ning, Yu, Hong, Yu, Hao, Cai, Yueyue, Huang, Linzhou, Xu, Cao, Xiong, Guosheng, Meng, Xiangbing, Wang, Jiyao, Chen, Haofeng, Liu, Guifu, Jing, Yanhui, Yuan, Yundong, Liang, Yan, Li, Shujia, Smith, Steven M., Li, Jiayang, Wang, Yonghong

المصدر: Plant Cell, 2018 Jul 01. 30(7), 1461-1475.

الوصول الحر: https://www.jstor.org/stable/90024051Test

المؤلفون: Wang, Wei, Hu, Bin, Yuan, Dingyang, Liu, Yongqiang, Che, Ronghui, Hu, Yingchun, Ou, Shujun, Liu, Yongxin, Zhang, Zhihua, Wang, Hongru, Hua Li, Jiang, Zhimin, Zhang, Zhengli, Gao, Xiaokai, Qiu, Yahong, Meng, Xiangbing, Liu, Yongxin, Bai, Yang, Liang, Yan, Wang, Yiqin, Zhang, Lianhe, Li, Legong, Sodmergen, Jing, Haichun, Li, Jiayang, Chu, Chengcai

المصدر: Plant Cell, 2018 Mar 01. 30(3), 638-651.

الوصول الحر: https://www.jstor.org/stable/90020471Test

المؤلفون: Fu, Shuai, Wang, Kun, Ma, Tingting, Liang, Yan, Ma, Zhonghua, Wu, Jianxiang, Xu, Yi, Zhou, Xueping

المصدر: Plant Cell; May2022, Vol. 34 Issue 5, p1822-1843, 22p

المؤلفون: Zhang, Ning, Yu, Hong, Yu, Hao, Cai, Yueyue, Huang, Linzhou, Xu, Cao, Xiong, Guosheng, Meng, Xiangbing, Wang, Jiyao, Chen, Haofeng, Liu, Guifu, Jing, Yanhui, Yuan, Yundong, Liang, Yan, Li, Shujia, Smith, Steven M., Li, Jiayang, Wang, Yonghong

المصدر: Plant Cell; Jul2018, Vol. 30 Issue 7, p1461-1475, 15p

المؤلفون: Deng, Yan, Dong, Haili, Mu, Jinye, Ren, Bo, Zheng, Binglian, Ji, Zhendong, Yang, Wei-Cai, Liang, Yan, Zuo, Jianru

المصدر: Plant Cell; Apr2010, Vol. 22 Issue 4, p1232-1248, 17p

مصطلحات موضوعية: HISTIDINE, ARABIDOPSIS, FEMALES, PROTEINS, GAMETOPHYTES

الشركة/الكيان: HEWLETT-Packard Development Co. LP

مستخلص: Cytokinin signaling is mediated by a multiple-step phosphorelay. Key components of the phosphorelay consist of the histidine kinase (HK)-type receptors, histidine phosphotransfer proteins (HP), and response regulators (RRs). Whereas overexpression of a nonreceptor-type HK gene CYTOKININ-INDEPENDENT1 (CKI1) activates cytokinin signaling by an unknown mechanism, mutations in CKI1 cause female gametophytic lethality. However, the function of CKI1 in cytokinin signaling remains unclear. Here, we characterize a mutant allele, cki1-8 , that can be transmitted through female gametophytes with low frequency (∼0.17%). We have recovered viable homozygous cki1-8 mutant plants that grow larger than wild-type plants, show defective megagametogenesis and rarely set enlarged seeds. We found that CKI1 acts upstream of AHP (Arabidopsis HP) genes, independently of cytokinin receptor genes. Consistently, an ahp1 , 2-2 , 3 , 4 , 5 quintuple mutant, which contains an ahp2-2 null mutant allele, exhibits severe defects in megagametogenesis, with a transmission efficiency of <3.45% through female gametophytes. Rarely recovered ahp1 , 2-2 , 3 , 4 , 5 quintuple mutants are seedling lethal. Finally, the female gametophytic lethal phenotype of cki1-5 (a null mutant) can be partially rescued by IPT8 or ARR1 (a type-B Arabidopsis RR) driven by a CKI1 promoter. These results define a genetic pathway consisting of CKI1 , AHPs , and type-B ARRs in the regulation of female gametophyte development and vegetative growth. [ABSTRACT FROM AUTHOR]

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