Global patterns of subgenome evolution in organelle-targeted genes of six allotetraploid angiosperms

Whole-genome duplications (WGDs), in which the number of nuclear genome copies is elevated as a result of autopolyploidy or allopolyploidy, are a prominent process of diversification in eukaryotes. The genetic and evolutionary forces that WGD imposes upon cytoplasmic genomes are not well understood, despite the central role that cytonuclear interactions play in eukaryotic function and fitness. Cellular respiration and photosynthesis depend upon successful interaction between the 3000+ nuclear-encoded proteins destined for the mitochondria or plastids and the gene products of cytoplasmic genomes in multi-subunit complexes such as OXPHOS, organellar ribosomes, Photosystems I and II, and Rubisco. Allopolyploids are thus faced with the critical task of coordinating interactions between nuclear and cytoplasmic genes that were inherited from different species. Because cytoplasmic genomes share a more recent history of common descent with the maternal nuclear subgenome than the paternal subgenome, evolutionary "mismatches" between the paternal subgenome and the cytoplasmic genomes in allopolyploids might lead to accelerated rates of evolution in the paternal homoeologs of allopolyploids, either through relaxed purifying selection or strong directional selection to rectify these mismatches. We tested this hypothesis in maternal vs. paternal copies of organelle-targeted genes in six allotetraploids: Brachypodium hybridum, Chenopodium quinoa, Coffea arabica, Gossypium hirsutum, Nicotiana tabacum, and Triticum dicoccoides. We report evidence that allopolyploid subgenomes exhibit unequal rates of protein-sequence evolution, but we did not observe global effects of cytonuclear incompatibilities on paternal homoeologs of organelle-targeted genes. Analyses of gene content revealed mixed evidence for whether organelle-targeted genes re-diploidize more rapidly than non-organelle-targeted genes. Together, these global analyses provide insights into the complex evolutionary dynamics of allopolyploids, showing that allopolyploid subgenomes have separate evolutionary trajectories despite sharing the same nucleus, generation time, and ecological context.

What Determines Host Range and Reproductive Performance of an Invasive Ambrosia Beetle Euwallacea fornicatus; Lessons From Israel and California

This study examined the polyphagous shot hole borer (PSHB) Euwallacea fornicatus (Coleoptera; Scolytinae) native to Southeast Asia and concentrated on its wide host range in two of the invaded areas, California and Israel. Among the 583 examined tree species, 55.9% were characterized as “non-reproductive hosts” and only 13.8% were characterized as “reproductive hosts,” suitable for the E. fornicatus reproduction. Families that included ≥20 species and genera with ≥10 were considered for further analysis. The highest percentage of tree species suitable for reproduction was obtained for Salicaceae and Sapindaceae, whereas the lowest percentage of tree species belonging to this category were within the Rosaceae, Myrtaceae, and Magnoliaceae. The genera Acer, Quercus and Acacia displayed the highest percentage within the “reproductive host” category, with the former significantly higher from all seven of the studied genera. We found that all Brachychiton and Erythrina were attacked and none of the examined 20 Eucalyptus spp. were suitable for E. fornicatus reproduction. The results suggest discordance between host tree phylogeny and susceptibility to the E. fornicatus, indicating that trait correlation of susceptibility of different tree species to the E. fornicatus are the results of convergent evolution and not of a common descent. A theoretical model, suggesting the different possibilities of potential tree species becoming attractive or non-attractive to E. fornicatus attack, is described. It is suggested that the beetle reproduction success rate over a wide host range, as well as the long list of species belonging to the “non-reproductive host” category, is the outcome of interactions between the beetle fungal symbiont, F. euwallaceae, and sapwood of the attacked tree. The model suggests that a tree selected by the E. fornicatus may fall in one of three groups, (i) those in which F. euwallaceae is unable to develop, (ii) those tree species that slow the development of the fungus, and (iii) those that enable F. euwallaceae to thrive. Hence, the host range suitable for beetle reproduction is determined by development of F. euwallaceae. In general, PSHB does not distinguish between host species of the “non-reproductive host” and “reproductive host” categories.

Circumpolar peoples and their languages: lexical and genomic data suggest ancient Chukotko-Kamchatkan–Nivkh and Yukaghir-Samoyedic connections

Relationships between universally recognized language families represent a hotly debated topic in historical linguistics, and the same is true for correlation between signals of genetic and linguistic relatedness. We developed a weighted permutation test and applied it on basic vocabularies for 31 pairs of languages and reconstructed proto-languages to show that three groups of circumpolar language families in the Northern Hemisphere show evidence of relationship though borrowing in the basic vocabulary or common descent: [Chukotko-Kamchatkan and Nivkh]; [Yukaghir and Samoyedic]; [Yeniseian, Na-Dene, and Burushaski]. The former two pairs showed the most significant signals of language relationship, and the same pairs demonstrated parallel signals of genetic relationship implying common descent or substantial gene flows. For finding the genetic signals we used genome-wide genetic data for present-day groups and a bootstrapping model comparison approach for admixture graphs or, alternatively, haplotype sharing statistics. Our findings further support some hypotheses on long-distance language relationship put forward based on the linguistic methods but lacking universal acceptance.

Evolutionary theories and the philosophy of science

Philosophical theories proceeding from the history of physical-mathematical sciences are hardly applicable to the analysis of biosciences and evolutionary theory, in particular. This article briefly reconstructs the history of evolutionary theory beginning with its roots in the 19th century and up to the ultracontemporary concepts. Our objective is to outline the dynamics of Darwinism and anti-Darwinism from the perspective of the philosophy of science. We begin with the arguments of E. Mayr against the applicability of T. Kuhn’s theory of scientific revolutions to the history of biology. Mayr emphasized that Darwin’s publication of the Origin of Species in 1859 caused a genuine scientific revolution in biology, but it was not a Kuhnian revolution. Darwin coined several theories comprising a complex theoretical system. Mayr defined five most crucial of these theories: evolution as such, common descent of all organisms including man, gradualism, the multiplication of species explaining organic diversity, and, finally, the theory of natural selection. Distinguishing these theories is of great significance because their destiny in the history of biology substantially differed. The acceptance of one theory by the majority of the scientific community does not necessarily mean the acceptance of others. Another argument by Mayr proved that Darwin caused two scientific revolutions in biology, which Mayr referred to as the First and Second Darwinian Revolutions. The Second Darwinian Revolution happened already in the 20th century and Mayr himself was its active participant. Both revolutions followed Darwin’s concept of natural selection. The period between these two revolutions can be in no way described as “normal science” in Kuhnian terms. Our reconstruction of the history of evolutionary theory support Mayr’s anti-Kuhnian arguments. Furthermore, we claim that the “evolution of evolutionary theory” can be interpreted in terms of the modified research programmes theory by Imre Lakatos, though not in their “purity”, but rather modified and combined with certain aspects of Marxian-Hegelian dialectics.

Ethnic Identity, Memory, and Sites of Violence

The Arab uprisings may have contributed to a newly “sectarianized” Middle East, yet more broadly this must be recognized as part of resurgent identity politics in which state exclusion, repression, and violence occur across ethnic, religious, and political divides. The mobilization of ethnic identities—the creation of distinct collectivities based on narratives of common descent—is as evident in nationalist diatribes throughout the region as it is in minority rights campaigns for equality or cultural autonomy. Ethnic identity formation requires both mnemonic discourses and specific sites in which social memories, imaginaries, and practices can be embedded and collectively performed. This chapter examines how geographies of violence—sites of historic trauma, loss, and displacement—are reappropriated through commemorative practice and martyr memorialization, which help shape contemporary ethnic narratives of identity and resistance. From Kurds in Irbil to Copts in Egypt to Palestinians inside Israel, each community attests to spatial exclusion and violence and finds ways of inhabiting and reimaging past trauma, to shape historical narratives and contemporary political expediencies. This chapter explores some of the key scholarship around this theme before examining the growing proliferation of martyr museums in the region.

Analysis on differences in Canada and China's official attitude and perception on their minority nationalities

The government’s perceptions and attitudes of their ethnic minorities are in close relation with the ethnic minorities’ welfare policies, and also affect the public’s perception of ethnic minorities. Therefore a government’s definition and attitudes are crucial to maintaining national stability. For instance, Canada is a multi-nation state, comprising multiple ethnic groups in one country, with the two most influential as the French-Canadians and the English-Canadians. French and English Canadians are majority ethnic groups while there are many other minority ethnic groups such as the First Nations. The People’s Republic of China is also a multi-nation state, although the biggest ethnic group, the Hans, comprise 98% of the entire population.11 Although all nations have their own cultural cognition - common descent, history, culture, and language - both Canada and China have their own unique definition for their minority nations: Canada’s minority nations are the Aboriginal People of Canada 22, and China’s minority nations are the 55 officially recognized ethnic groups other than the Han people. This essay aims to compare the official perceptions and attitudes of ethnic minorities in China and Canada, hoping to clarify the relationship between ethnic minorities and mainstream ethnic groups, and help the general public to understand them, hence promoting harmonious societal development.

Alfred Russel Wallace’s Intelligent Evolution and Natural Theology

Alfred Russel Wallace’s conception of evolution and its relation to natural theology is examined. That conception is described as intelligent evolution—directed, detectably designed, and purposeful common descent. This essay extends discussion of the forces and influences behind Wallace’s journey from the acknowledged co-discoverer of natural selection, to include his much lesser known position within the larger history of natural theology. It will do so by contextualizing it with an analysis of Darwin’s metaphysical commitments identified as undogmatic atheism. In this sense, David Kohn’s thesis that Darwin was the “last of the natural theologians” is revised to suggest that Wallace deserves to be included within the larger context of the British natural theologians in a surprisingly Paleyan tradition. As such, an important object of this essay is to clear away the historical fog that has surrounded this aspect of Wallace. That “fog” is composed of various formal historical fallacies that will be outlined in the penultimate section. Once described, explained, and corrected, Wallace becomes an enduring figure in carrying the British tradition of natural theology into the twentieth century and beyond.

Reflections on the Medieval and Early Modern Insular Identities

The article reflects on the monograph by Sparky Booker Cultural exchange and identity in late medieval Ireland: The English and the Irish of the four obedient shires (Cambridge, Cambridge University Press, 2018) which offers a revised perspective on the issue of assimilation and acculturation in late medieval Ireland on the basis of the material of the four obedient shires: Dublin, Meath, Louth, and Kildare. The scholar presents a complex and multi-faceted image of interethnic interplay in the region distinguishing between cultural and legal dimensions. She demonstrates that cultural practices were not the main resource of identity in the late medieval Ireland in which political allegiance and descent were prioritized. She highlights two aspects: the discursive level and the level of everyday interaction. Despite the obvious merits of the book, the material presented there requires more theoretical consideration of the issue of medieval identities. The authors of the article argue that the situation of interethnic interplay in the four obedient shires described by Booker could have been suitable for the emergence of consensual identity. Having coined this term, the authors define it as the type of identity which originates in the situation of interethnic interplay; entails intercultural switching; and has supragentile character, i.e., not insisting on common descent. The discourse of consensual identity did not emerge in the four shires during the period under consideration because of the absence of common subjecthood of the English and the Irish as well as prevalence of gentilism but its full potential was realized during the Early Stuarts.

Growth of Muslim Community as Minority in India

The Encyclopedia of Britannica minority means “group held together by ties of common descent, language or religious faith and feeling different in these respects from the inhabitants of a given political entity.” This study be related about minorities, especially Muslim community, their constitutional rights and safeguards, socio-economic conditions and other safeguards like welfare Programs and various government reports and commissions, including Minority Ministry in India. This study is important because it details the legal definition, rules and regulations and the other terms related to the discussion of minority. This paper is an attempt to showcase the relationship between minority development policies and satisfaction to the community.