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hybrid sterility

Flore Mas, Aimee Harper, Rachael Horner, Taylor Welsh, Peter Jaksons, David M Suckling
BACKGROUND: Crop breeding programmes generally select for traits for improved yield and human consumption preferences. Yet, they often overlook one fundamental trait essential for insect-pollinated crops: Pollinator attraction. This is even more critical for hybrid plants that rely on cross-pollination between the male-fertile line and the male-sterile line to set seeds. We investigated the role of floral odours for honey bee pollination that could explain the poor seed yield in hybrid crops...
February 15, 2018: Journal of the Science of Food and Agriculture
Yohei Koide, Atsushi Ogino, Takanori Yoshikawa, Yuki Kitashima, Nozomi Saito, Yoshitaka Kanaoka, Kazumitsu Onishi, Yoshihiro Yoshitake, Takuji Tsukiyama, Hiroki Saito, Masayoshi Teraishi, Yoshiyuki Yamagata, Aiko Uemura, Hiroki Takagi, Yoriko Hayashi, Tomoko Abe, Yoshimichi Fukuta, Yutaka Okumoto, Akira Kanazawa
Understanding the genetic basis of reproductive barriers between species has been a central issue in evolutionary biology. The S 1 locus in rice causes hybrid sterility and is a major reproductive barrier between two rice species, Oryza sativa and Oryza glaberrima The O. glaberrima -derived allele (denoted S 1 g ) on the S 1 locus causes preferential abortion of gametes with its allelic alternative (denoted S 1 s ) in S 1 g / S 1 s heterozygotes. Here, we used mutagenesis and screening of fertile hybrid plants to isolate a mutant with an allele, S 1 mut , which does not confer sterility in the S 1 mut / S 1 g and S 1 mut / S 1 s hybrids...
February 14, 2018: Proceedings of the National Academy of Sciences of the United States of America
Zheyong Xue, Xia Xu, Yuan Zhou, Xiaoning Wang, Yingchun Zhang, Dan Liu, Binbin Zhao, Lixin Duan, Xiaoquan Qi
In flowering plants, the pollen coat protects the released male germ cells from desiccation and damage during pollination. However, we know little about the mechanism by which the chemical composition of the pollen coat prevents dehydration of pollen grains. Here we report that deficiency of a grass conserved triterpene synthase, OsOSC12/OsPTS1, in rice leads to failure of pollen coat formation. The mutant plants are male sterile at low relative humidity (RH < 60%), but fully male fertile at high relative humidity (>80%)...
February 9, 2018: Nature Communications
Yongbin Qi, Linyou Wang, Junmei Gui, Lixia Zhang, Qinglong Liu, Jianjun Wang
The fertility conversion of photoperiod thermo-sensitive genic male sterility (P/TGMS) lines in rice is mostly regulated by the P/TGMS genes in different environmental conditions. A point mutation with G-C on the pms3 (p/tms12-1) gene regulates the pollen fertility of Nongken58S and a large amount of Nongken58S-derived lines. In this study, we developed and designed a functional co-dominant marker according to the SNP loci for the pms3 (p/tms12-1) gene. We can differentiate the SNP loci in pms3 (p/tms12-1) gene from another TGMS lines and inbred cultivars using the dpms3-54 marker...
December 2017: Breeding Science
Congyang Mao, Yiming Xiang, Xiangmei Liu, Zhenduo Cui, Xianjin Yang, Zhaoyang Li, Shengli Zhu, Yufeng Zheng, Kelvin Wai Kwok Yeung, Shuilin Wu
Despite the development of advanced antibacterial materials, bacterial infection is still a serious problem for wound healing because it usually induces severe complications and cannot be eradicated completely. Most current materials cannot simultaneously provide antibacterial activity, reusability, and biocompatibility as well as participate in stimulating cell behaviors to promote bacteria-accompanied wound healing. This work fabricated a hybrid hydrogel embedded with two-dimensional (2D) few-layer black phosphorus nanosheets (BPs) via simple electrostatic interaction...
February 2, 2018: ACS Nano
Alexandre Kuhn, Hugo Darras, Serge Aron
Caste determination in social Hymenoptera (whether a female egg develops into a reproductive queen or a sterile worker) is a remarkable example of phenotypic plasticity where females with highly similar genomes exhibit striking differences in morphology and behaviour. This phenotypic dichotomy is typically influenced by environmental factors. However, recent studies have revealed a strong caste-genotype association in hybridogenetic ants: workers are all interlineage hybrids while queens are all purebred, suggesting that female caste fate is genetically determined...
January 2018: Biology Letters
Wanju Shi, Xiang Li, Ralf C Schmidt, Paul C Struik, Xinyou Yin, S V Krishna Jagadish
High temperature during flowering in rice causes spikelet sterility and is a major threat to rice productivity in tropical and subtropical regions, where hybrid rice development is increasingly contributing to sustain food security. However, the sensitivity of hybrids to increasing temperature and physiological responses in terms of dynamic fertilization processes are unknown. To address these questions, several promising hybrids and inbreds were exposed to control and high day-time temperature (HDT) in Experiment 1 and hybrids having contrasting heat tolerance were selected for Experiment 2 for further physiological investigation under high day and night temperature treatments...
January 15, 2018: Plant, Cell & Environment
Ankita Mishra, Abhishek Bohra
Latest outcomes assign functional role to non-coding (nc) RNA molecules in regulatory networks that confer male sterility to plants. Male sterility in plants offers great opportunity for improving crop performance through application of hybrid technology. In this respect, cytoplasmic male sterility (CMS) and sterility induced by photoperiod (PGMS)/temperature (TGMS) have greatly facilitated development of high-yielding hybrids in crops. Participation of non-coding (nc) RNA molecules in plant reproductive development is increasingly becoming evident...
January 13, 2018: Plant Cell Reports
Anne-Kari Holm, Abdelhameed Elameen, Benedikte W Oliver, Lars O Brandsæter, Inger S Fløistad, May B Brurberg
Knowledge about the reproduction strategies of invasive species is fundamental for effective control. The invasive Fallopia taxa (Japanese knotweed s.l.) reproduce mainly clonally in Europe, and preventing spread of vegetative fragments is the most important control measure. However, high levels of genetic variation within the hybrid F. × bohemica indicate that hybridization and seed dispersal could be important. In Norway in northern Europe, it is assumed that these taxa do not reproduce sexually due to low temperatures in the autumn when the plants are flowering...
January 2018: Ecology and Evolution
Libor Mořkovský, Václav Janoušek, Jiří Reif, Jakub Rídl, Jan Pačes, Lukáš Choleva, Karel Janko, Michael W Nachman, Radka Reifová
Hybrid sterility is a common first step in the evolution of postzygotic reproductive isolation. According to Haldane's Rule it affects predominantly the heterogametic sex. While the genetic basis of hybrid male sterility in organisms with heterogametic males has been studied for decades, the genetic basis of hybrid female sterility in organisms with heterogametic females has received much less attention. We investigated the genetic basis of reproductive isolation in two closely related avian species, the Common Nightingale (Luscinia megarhynchos) and the Thrush Nightingale (L...
January 10, 2018: Molecular Ecology
Hongzhan Liu, Gaisheng Zhang, Junsheng Wang, Jingjing Li, Yulong Song, Lin Qiao, Na Niu, Junwei Wang, Shoucai Ma, Lili Li
BACKGROUND: Heterosis is widely used to increase the yield of many crops. However, as wheat is a self-pollinating crop, hybrid breeding is not so successful in this organism. Even though male sterility induced by chemical hybridizing agents is an important aspect of crossbreeding, the mechanisms by which these agents induce male sterility in wheat is not well understood. RESULTS: We performed proteomic analyses using the wheat Triticum aestivum identify those proteins involved in physiological male sterility (PHYMS) induced by the chemical hybridizing agent CHA SQ-1...
January 5, 2018: BMC Plant Biology
Xi-Qiong Liu, Cheng-Yu Yu, Jun-Gang Dong, Ai-Xia Xu, Sheng-Wu Hu
Premise of the study: SP2S is a spontaneous thermo-sensitive genic male sterility (TGMS) mutation that facilitates two-line hybrid breeding in Brassica napus (Brassicaceae). De novo assembly of the floral bud transcriptome of SP2S can provide a foundation for deciphering the transcriptional regulation of SP2S in response to temperature change. Methods: mRNAs of the young floral buds of SP2S and its near-isogenic line SP2F grown under cool (16°C)/warm (22°C) conditions were sequenced on an Illumina Solexa platform, producing 239...
December 2017: Applications in Plant Sciences
Xiao Ma, Zhuo Zheng, Fanshu Lin, Tingting Ge, Huimin Sun
Rice is one of the main food crops and several studies have examined the molecular mechanism of the exposure of the rice plant stigma. The improvement in the exposure of the stigma in female parent hybrid combinations can enhance the efficiency of hybrid breeding. In the present study, a mutant plant with low exposed stigma (lesr) was discovered among the descendants of the indica thermo-sensitive sterile line 115S. The ES% rate of the mutant decreased by 70.64% compared with the wild type variety. The F2 population was established by genetic analysis considering the mutant as the female parent and the restorer line 93S as the male parent...
2018: PloS One
Fábio Ferreira de Queiroz, Giane Chaves Kristosch, Flávio Landim Soffiati, Mônica Jorge Luz, André Lacerda de Abreu Oliveira, Tânia Ribeiro Junqueira Borges, Carlos Ramón Ruiz Miranda, Leonardo Serafim da Silveira
Population control techniques, either permanent or reversible, are important tools for the management of wildlife in captive and natural environments. Among these, surgical sterilization provides a permanent solution to unwanted reproduction. Surgical techniques can differ in their invasiveness and in the subsequent effect on behavior and physiology. For social animals, techniques that preserve gonads, such as vasectomy for males and ligation of uterine tubes for females, may be preferred because they maintain important physiology that influences behavior...
December 2017: Journal of Zoo and Wildlife Medicine: Official Publication of the American Association of Zoo Veterinarians
Ting Zou, Qiao Xiao, Wenjie Li, Tao Luo, Guoqiang Yuan, Zhiyuan He, Mingxing Liu, Qiao Li, Peizhou Xu, Jun Zhu, Yueyang Liang, Qiming Deng, Shiquan Wang, Aiping Zheng, Lingxia Wang, Ping Li, Shuangcheng Li
BACKGROUND: Male fertility is crucial for rice yield, and the improvement of rice yield requires hybrid production that depends on male sterile lines. Although recent studies have revealed several important genes in male reproductive development, our understanding of the mechanisms of rice pollen development remains unclear. RESULTS: We identified a rice mutant oslap6 with complete male sterile phenotype caused by defects in pollen exine formation. By using the MutMap method, we found that a single nucleotide polymorphism (SNP) variation located in the second exon of OsLAP6/OsPKS1 was responsible for the mutant phenotype...
December 28, 2017: Rice
Manus M Patten
In two papers published at about the same time almost thirty years ago, Frank (1991a) and Hurst and Pomiankowski (1991) independently suggested that divergence of meiotic drive systems-comprising genes that cheat meiosis and genes that suppress this cheating-might provide a general explanation for Haldane's rule and the large X-effect in interspecific hybrids. Although at the time the idea was met with skepticism and a conspicuous absence of empirical support, the tide has since turned. Some of the clearest mechanistic explanations we have for hybrid male sterility involve meiotic drive systems, and several other cases of hybrid sterility are suggestive of a role for meiotic drive...
December 27, 2017: Molecular Ecology
Xin Li, Ying He, Jie Yang, Yin-Hua Jia, Han-Lai Zeng
Abnormal environment weather can cause rice photoperiod-thermo-sensitive genic male sterile (PTGMS) lines fertile or partially fertile and thus cause the mixture of true hybrids with selfing seeds. Seedling-specific green-revertible albino leaf color mutant can be used to distinguish the real hybrids. Besides, it can also be used as an ideal material to research the development of chloroplast and biosynthesis of chlorophyll. The phenotype of leaf color mutants includes light green, yellowing, albino, green-revertible albino...
January 2018: Plant Science: An International Journal of Experimental Plant Biology
Cassandra L Thiel, Emily Schehlein, Thulasiraj Ravilla, R D Ravindran, Alan L Robin, Osamah J Saeedi, Joel S Schuman, Rengaraj Venkatesh
PURPOSE: To measure the waste generation and lifecycle environmental emissions from cataract surgery via phacoemulsification in a recognized resource-efficient setting. SETTING: Two tertiary care centers of the Aravind Eye Care System in southern India. DESIGN: Observational case series. METHODS: Manual waste audits, purchasing data, and interviews with Aravind staff were used in a hybrid environmental lifecycle assessment framework to quantify the environmental emissions associated with cataract surgery...
November 2017: Journal of Cataract and Refractive Surgery
Yang Gao, Xin Fang, David F Vincent, David W Threadgill, Laurent Bartholin, Qinglei Li
BACKGROUND: Transforming growth factor beta (TGFB) superfamily signaling is implicated in the development of sex cord-stromal tumors, a category of poorly defined gonadal tumors. The aim of this study was to determine potential effects of dysregulated TGFB signaling in the ovary using Cre recombinase driven by growth differentiation factor 9 (Gdf9) promoter known to be expressed in oocytes. METHODS: A mouse model containing constitutively active TGFBR1 (TGFBR1CA) using Gdf9-iCre (termed TGFBR1-CAG9Cre) was generated...
December 8, 2017: Reproductive Biology and Endocrinology: RB&E
Xiaoqiong Qin, Wentao Li, Yang Liu, Meilian Tan, Martin Ganal, Roger T Chetelat
Multiple independent and overlapping pollen rejection pathways contribute to unilateral interspecific incompatibility (UI). In crosses between tomato species, interspecific pollen rejection usually occurs when the female parent is self-incompatible and the male parent self-compatible (the 'SI x SC rule'). Additional, as yet unknown UI mechanisms are independent of self-incompatibility and contribute to UI between SC species or populations. We identified a major QTL on chromosome 10 (ui10.1) which affects pollen-side UI responses in crosses between cultivated tomato, Solanum lycopersicum, and S...
December 5, 2017: Plant Journal: for Cell and Molecular Biology
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