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hybrid sterility

Shiyong Song, Ying Chen, Lu Liu, Yen How Benjamin See, Chuanzao Mao, Yinbo Gan, Hao Yu
Anther dehiscence determines successful sexual reproduction of flowering plants through timely release of pollen grains for pollination and fertilization. Downregulation of auxin levels during pollen mitosis is essential for promoting anther dehiscence along with pollen maturation. How this key transition of auxin levels is regulated in male organs remains elusive. Here, we report that the rice FT-INTERACTING PROTEIN 7 is highly expressed in anthers before pollen mitotic divisions and facilitates nuclear translocation of a homeodomain transcription factor, Oryza sativa homeobox 1, which directly suppresses a predominant auxin biosynthetic gene, OsYUCCA4, during the late development of anthers...
June 18, 2018: Nature Plants
Zihan Liu, Xiaoyi Shi, Sha Li, Gan Hu, Lingli Zhang, Xiyue Song
Cytoplasmic male sterility (CMS) plays a crucial role in the utilization of hybrid vigor. Pollen development is often accompanied by oxidative metabolism responses and tapetal programmed cell death (PCD), and deficiency in these processes could lead to male sterility. Aegilops uniaristata cytoplasmic male sterility (Mu-CMS) wheat is a novel male-sterile line in wheat, which possess important potential in hybrid wheat breeding. However, its CMS mechanisms remain poorly understood. In our study, U87B1-706A, with the Aegilops uniaristata cytoplasm, and the maintainer line 706B were used to explore the abortive reason...
June 8, 2018: International Journal of Molecular Sciences
Ann Gaffney, Björn Bohman, Stephen R Quarrell, Philip H Brown, Geoff R Allen
Insect crop visitations do not necessarily translate to carriage or transfer of pollen. To evaluate the potential of the various insects visiting hybrid carrot flowers to facilitate pollen transfer, this study examines insect visitation rates to hybrid carrot seed crops in relation to weather, time of day and season, pollen carrying capacity, inter-row movement, and visitation frequency to male-fertile and male-sterile umbels. The highest pollen loads were carried by nectar scarabs, honey bees, and the hover fly Eristalis tenax (Linnaeus)...
June 7, 2018: Insects
Xiaowen Yu, Zhigang Zhao, Xiaoming Zheng, Jiawu Zhou, Weiyi Kong, Peiran Wang, Wenting Bai, Hai Zheng, Huan Zhang, Jing Li, Jiafan Liu, Qiming Wang, Long Zhang, Kai Liu, Yang Yu, Xiuping Guo, Jiulin Wang, Qibing Lin, Fuqing Wu, Yulong Ren, Shanshan Zhu, Xin Zhang, Zhijun Cheng, Cailin Lei, Shijia Liu, Xi Liu, Yunlu Tian, Ling Jiang, Song Ge, Chuanyin Wu, Dayun Tao, Haiyang Wang, Jianmin Wan
Selfish genetic elements are pervasive in eukaryote genomes, but their role remains controversial. We show that qHMS7 , a major quantitative genetic locus for hybrid male sterility between wild rice ( Oryza meridionalis ) and Asian cultivated rice ( O. sativa ), contains two tightly linked genes [ Open Reading Frame 2 ( ORF2 ) and ORF3 ]. ORF2 encodes a toxic genetic element that aborts pollen in a sporophytic manner, whereas ORF3 encodes an antidote that protects pollen in a gametophytic manner. Pollens lacking ORF3 are selectively eliminated, leading to segregation distortion in the progeny...
June 8, 2018: Science
Youming Huang, Xiaochun Zeng, Heping Cao
Plant hormones play important roles in regulating every aspect of growth, development, and metabolism of plants. We are interested in understanding hormonal regulation of floret opening and closure in plants. This is a particularly important problem for hybrid rice because regulation of flowering time is vitally important in hybrid rice seed production. However, little was known about the effects of plant hormones on rice flowering. We have shown that jasmonate and methyl jasmonate play significant roles in promoting rice floret opening...
2018: PloS One
Yu Zhang, Jiawu Zhou, Jing Li, Ying Yang, Peng Xu, Dayun Tao
Oryza glumaepatula originates from South America continent and contains many valuable traits, such as tolerance to abiotic stress, high yield and good cooking qualities. However, hybrid sterility severely hindered the utilization of favorable genes of O. glumaepatula by interspecific hybridization. In order to further understand the nature of hybrid sterility between O. sativa and O. glumaepatula , a near isogenic line (NIL) was developed using a japonica variety Dianjingyou 1 as the recurrent parent and an accession of O...
March 2018: Breeding Science
Jie Li, Yihao Li, Yanling Deng, Ping Chen, Fen Feng, Wanwan Chen, Xiaojin Zhou, Yingdian Wang
Calcium-dependent protein kinases (CPKs) play an essential role in the regulation of pollen tube growth. Although CPK genes have been identified in maize, and some have been functionally characterized, the molecular function of ZmCPKs associated with pollen tube development remains less well studied. Here, we report that a pollen-specific CPK, ZmCPK32, is involved in the regulation of pollen germination and tube extension. ZmCPK32 exhibited CPK activity and was localized on the plasma membrane and punctate internal membrane compartments via N-terminal acylation...
2018: PloS One
Sergei Y Funikov, Dina A Kulikova, George S Krasnov, Alexander P Rezvykh, Lubov N Chuvakova, Natalia G Shostak, Elena S Zelentsova, Justin P Blumenstiel, Michael B Evgen'ev
Syndromes of hybrid dysgenesis (HD) have been critical for our understanding of the transgenerational maintenance of genome stability by piRNA. HD in D. virilis represents a special case of HD since it includes simultaneous mobilization of a set of TEs that belong to different classes. The standard explanation for HD is that eggs of the responder strains lack an abundant pool of piRNAs corresponding to the asymmetric TE families transmitted solely by sperm. However, there are several strains of D. virilis that lack asymmetric TEs, but exhibit a "neutral" cytotype that confers resistance to HD...
May 29, 2018: PLoS Genetics
Quirina M B de Ruiter, Marloes M Jansen, Frans L Moll, Constantijn E V B Hazenberg, Nicoletta N Kahya, Joost A van Herwaarden
OBJECTIVE: This study measured the cumulative occupational X-ray radiation dose received by support staff during endovascular aortic procedures and during additional intraoperative steps in the hybrid operating room. METHODS: Radiation dose measurements were performed during interventions on 65 patients receiving 90 stent grafts during endovascular aneurysm repair (EVAR), bifurcated EVAR, thoracic EVAR, iliac branched device deployment, aortouni-iliac stenting, and fenestrated/branched EVAR (F/BrEVAR)...
June 2018: Journal of Vascular Surgery
Zhikai Liang, Shashi K Gupta, Cheng-Ting Yeh, Yang Zhang, Daniel W Ngu, Ramesh Kumar, Hemant T Patil, Kanulal D Mungra, Dev Vart Yadav, Abhishek Rathore, Rakesh K Srivastava, Rajeev Gupta, Jinliang Yang, Rajeev K Varshney, Patrick S Schnable, James C Schnable
BACKGROUND: Pearl millet is a non-model grain and fodder crop adapted to extremely hot and dry environments globally. In India, a great deal of public and private sectors' investment has focused on developing pearl millet single cross hybrids based on the cytoplasmic-genetic male sterility (CMS) system, while in Africa most pearl millet production relies on open pollinated varieties. Pearl millet lines were phenotyped for both the inbred parents and hybrids stage. Many breeding efforts focus on phenotypic selection of inbred parents to generate improved parental lines and hybrids...
May 24, 2018: G3: Genes—Genomes—Genetics
Mark Ravinet, Kohta Yoshida, Shuji Shigenobu, Atsushi Toyoda, Asao Fujiyama, Jun Kitano
Speciation is a continuous process and analysis of species pairs at different stages of divergence provides insight into how it unfolds. Previous genomic studies on young species pairs have revealed peaks of divergence and heterogeneous genomic differentiation. Yet less known is how localised peaks of differentiation progress to genome-wide divergence during the later stages of speciation in the presence of persistent gene flow. Spanning the speciation continuum, stickleback species pairs are ideal for investigating how genomic divergence builds up during speciation...
May 23, 2018: PLoS Genetics
Peter A Moran, Sonia Pascoal, Timothee Cezard, Judith E Risse, Michael G Ritchie, Nathan W Bailey
Linking intraspecific and interspecific divergence is an important challenge in speciation research. X chromosomes are expected to evolve faster than autosomes and disproportionately contribute to reproductive barriers, and comparing genetic variation on X and autosomal markers within and between species can elucidate evolutionary processes that shape genome variation. We performed RADseq on a 16-population transect of two closely-related Australian cricket species, Teleogryllus commodus and T. oceanicus, covering allopatry and sympatry...
May 22, 2018: Molecular Ecology
Zhuo Fan Zhao, Ling Huang, Yong Ming Liu, Peng Zhang, Gui Wei, Mo Ju Cao
Maize is one of the first crops to produce hybrids using cytoplasmic male sterile lines. The C-type cytoplasmic male sterile (CMS-C) line is vital for hybrid seed production, and the fertility-restoration reaction along with its stability has a direct bearing on its applications. However, fertility restoration mechanism of CMS-C is complex and is still not clear so far. To further explore the factors affecting the fertility restoration of maize CMS, a series of test crosses were carried out by pollinating the isocytoplasm allonuclear CMS-C lines C48-2, Chuangzaosi and C478 with the test lines 18 bai, zi 330, 5022 and the restorer line A619, respectively...
May 20, 2018: Yi Chuan, Hereditas
Zihan Liu, Xiaoyi Shi, Sha Li, Lingli Zhang, Xiyue Song
Cytoplasmic male sterility is crucial for the utilization of hybrid heterosis and it possibly occurs in parallel with tapetal programmed cell death (PCD) and oxidative metabolism responses. However, little is known about the mechanisms that underlie pollen abortion in wheat. Therefore, we obtained two isonuclear alloplasmic male sterile lines (IAMSLs) with Aegilops kotschyi and Ae. juvenalis cytoplasm. Compared with the maintainer line, cytochemical analyses of the anthers demonstrated that the IAMSLs exhibited anomalous tapetal PCD and organelles, with premature PCD in K87B1-706A and delayed PCD in Ju87B1-706A...
2018: Frontiers in Plant Science
Xiang Wang, Zeyuan Guan, Zhou Gong, Junjie Yan, Guangsheng Yang, Yao-Guang Liu, Ping Yin
Plant cytoplasmic male sterility (CMS) is an important phenomenon and is widely utilized in hybrid crop breeding. The Wild Abortive CMS (CMS-WA), a well-known CMS type, has been successfully applied in the commercial production of hybrid rice seeds for more than 40 years. The CMS-WA causal gene WA352 encodes a novel transmenbrane protein and the interacts with the mitochondrial copper chaperone COX11, triggering reactive oxygen species production and resulting in male sterility in CMS-WA lines. However, the structure of WA352 is currently unknown, and the structural mechanism whereby WA352 perturbs COX11 function to cause CMS remains largely unknown...
May 15, 2018: Biochemical and Biophysical Research Communications
Yang Xu, Xin Wang, Xiaowen Ding, Xingfei Zheng, Zefeng Yang, Chenwu Xu, Zhongli Hu
BACKGROUND: Hybrid breeding is an effective tool to improve yield in rice, while parental selection remains the key and difficult issue. Genomic selection (GS) provides opportunities to predict the performance of hybrids before phenotypes are measured. However, the application of GS is influenced by several genetic and statistical factors. Here, we used a rice North Carolina II (NC II) population constructed by crossing 115 rice varieties with five male sterile lines as a model to evaluate effects of statistical methods, heritability, marker density and training population size on prediction for hybrid performance...
May 10, 2018: Rice
Shelley E Hoover, Lynae P Ovinge
Hybrid canola seed production is an important pollination market in Canada; typically both honey bees (Apis mellifera L. (Hymenoptera: Apidae)) and Alfalfa Leafcutting bees (Megachile rotundata Fab. (Hymenoptera: Megachilidae)) are concurrently managed to ensure pollination in this high-value crop. Beekeepers are paid to provide pollination services, and the colonies also produce a honey crop from the canola. Pollen availability from male-fertile plants is carefully managed in this crop to provide an abundance of pollen to fertilize male-sterile ('female') plants...
May 9, 2018: Journal of Economic Entomology
Tetsuya Murakami, Tomohiko Kazama, Kinya Toriyama
BACKGROUND: Male sterility is a useful agronomic trait for breeding of self-pollinating crops and is often observed in the progenies of hybrids of distantly related species, for example, Oryza sativa L. subsp. indica and O. sativa L. subsp. japonica. To explore new male sterile lines in rice, we performed successive backcrosses using a japonica cultivar Taichung 65 (T65) as a recurrent pollen parent and various indica cultivars as the initial female parents. FINDINGS: We observed male sterile plants in the backcross progeny from an indica cultivar, Lebed...
May 3, 2018: Rice
Gaoming Zhang, Jiali Ye, Yulin Jia, Lingli Zhang, Xiyue Song
A “two-line hybrid system” was developed, previously based on thermo-sensitive cytoplasmic male sterility in Aegilops kotschyi (K-TCMS), which can be used in wheat breeding. The K-TCMS line exhibits complete male sterility and it can be used to produce hybrid wheat seeds during the normal wheat-growing season; it propagates via self-pollination at high temperatures. Isobaric tags for relative and absolute quantification-based quantitative proteome and bioinformatics analyses of the TCMS line KTM3315A were conducted under different fertility conditions to understand the mechanisms of fertility conversion in the pollen development stages...
May 2, 2018: International Journal of Molecular Sciences
Diógenes Henrique de Siqueira-Silva, Taiju Saito, Amanda Pereira Dos Santos-Silva, Raphael da Silva Costa, Martin Psenicka, George Shigueki Yasui
This review discusses the new biotechnological tools that are arising and promising for conservation and enhancement of fish production, mainly regarding the endangered and the most economically important species. Two main techniques, in particular, are available to avoid extinction of endangered fish species and to improve the production of commercial species. Germ cell transplantation technology includes a number of approaches that have been studied, such as the transplantation of embryo-to-embryo blastomere, embryo-to-embryo differentiated PGC, larvae to larvae and embryo differentiated PGC, transplantation of spermatogonia from adult to larvae or between adults, and oogonia transplantation...
April 29, 2018: Fish Physiology and Biochemistry
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