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2022 ◽  
Vol 175 ◽  
pp. 106501
Author(s):  
Harsha Fowdar ◽  
Emily Payne ◽  
Ana Deletic ◽  
Kefeng Zhang ◽  
David McCarthy

Plants ◽  
2022 ◽  
Vol 11 (2) ◽  
pp. 222
Author(s):  
Gian Marco Ludovici ◽  
Andrea Chierici ◽  
Susana Oliveira de Souza ◽  
Francesco d’Errico ◽  
Alba Iannotti ◽  
...  

The aim of this work is to analyze the effects of ionizing radiation and radionuclides (like 137Cs) in several higher plants located around the Fukushima Dai-ichi Nuclear Power Plant (FNPP), evaluating both their adaptive processes and evolution. After the FNPP accident in March 2011 much attention was focused to the biological consequences of ionizing radiation and radionuclides released in the area surrounding the nuclear plant. This unexpected mishap led to the emission of radionuclides in aerosol and gaseous forms from the power plant, which contaminated a large area, including wild forest, cities, farmlands, mountains, and the sea, causing serious problems. Large quantities of 131I, 137Cs, and 134Cs were detected in the fallout. People were evacuated but the flora continued to be affected by the radiation exposure and by the radioactive dusts’ fallout. The response of biota to FNPP irradiation was a complex interaction among radiation dose, dose rate, temporal and spatial variation, varying radiation sensitivities of the different plants’ species, and indirect effects from other events. The repeated ionizing radiations, acute or chronic, guarantee an adaptation of the plant species, demonstrating a radio-resistance. Consequently, ionizing radiation affects the genetic structure, especially during chronic irradiation, reducing genetic variability. This reduction is associated with the different susceptibility of plant species to chronic stress. This would confirm the adaptive theory associated with this phenomenon. The effects that ionizing radiation has on different life forms are examined in this review using the FNPP disaster as a case study focusing the attention ten years after the accident.


Meliora ◽  
2022 ◽  
Vol 1 (2) ◽  
Author(s):  
Esther Goldberg

This thesis attends to the slippages between life and nonlife in Emily Fridlunds 2017 novel History of Wolves. It traces the matter that is granted life or animacy, as well as the matter that is devitalized. Through the protagonist, Linda, the novel investigates the role of both scientific knowledge production and Christian Science in placing arbitrary biological limits on life forms, making some visible and others unseeable and unsayable. The thesis fleshes out the characters’ climate denial as yet another erasure of the animate agents. Ultimately, the thesis asks: if we can expand what is worthy of life, can we, in turn, expand what agents, actors, and matters are deserving of care?  


2022 ◽  
Vol 11 (1) ◽  
Author(s):  
Ya-Fei Shi ◽  
Zeng-Ru Wang ◽  
Bing-Xin Xu ◽  
Jian-Qiang Huo ◽  
Rui Hu ◽  
...  

Abstract Background Soil seed banks may offer great potential for maintaining and restoring desert ecosystems that have been degraded by climate change and anthropogenic disturbance. However, few studies have explored the year-to-year dynamics in the species composition (richness and abundance) of these desert soil seed banks. Thus, we conducted a 4-year study to assess the effects of environmental factors (meteorology and microtopography) and aboveground vegetation on the soil seed bank of the Tengger Desert, China. Results We found the seed bank was dominated by annual herb species both in species richness and abundance. More rainfall in the growing season increased the number of seeds in the soil seed bank, and quadrat micro-elevation had a negative effect on soil seed bank size. The species composition in the seed bank had significantly larger between-year similarity than that in the aboveground vegetation due to the dominance of annual herb species. For different life forms, the species composition of annual herbs showed distinctly larger temporal similarity between the aboveground vegetation and the seed bank compared with perennial herbs and shrubs. Conclusions Our findings highlight that the combined effects of environmental factors and plant life forms determine the species composition (especially the abundance) of soil seed banks in deserts. However, if degraded desert ecosystems are left to regenerate naturally, the lack of shrub and perennial herb seeds could crucially limit their restoration. Human intervention and management may have to be applied to enhance the seed abundance of perennial lifeforms in degraded deserts.


Author(s):  
Zarrin Sarhadynejad ◽  
Fariba Sharififar ◽  
Touba Eslaminejad ◽  
Zohreh Sarhadinejad ◽  
Ahmad Pourmirzaie ◽  
...  

Ethnobotanical studies try to gather indigenous cultures plant knowledge from different regions and tribes all over the world. This study aimed at obtaining, documenting and analyzing medicinal plants used by some ethnic groups in Bardsir region, Kerman province, Iran. Data collection was done through face-to-face interviews, and finally, 120 questionnaires were filled out. Based on the local knowledge, the data collection was analyzed using quantitative values including family importance value (FIV), relative frequency of citation (RFC), fidelity level (FL), use-value index (UV), and factor of informant consensus (FIC). In this study, 47 medicinal plants were recorded belonging to 22 families. The results expressed the highest FIV belonged to Lamiaceae (57%) family. The hemicryptophytes (49%) were also regarded as the most common life forms of the used species. In the current study, the highest RFCs and UV indices belonged to Urtica urens L. 0.21, and 0.39, respectively. Achillea santolinoides subsp. wilhelmsii (K.Koch) Greuter, and Teucrium polium L. had the maximum percentage of FL for treating digestive system disorders. In the present study, the highest indices belonged to U. urens, A. santolinoides subsp. wilhelmsii and T. polium; thus, it is recommended conducting further in vitro and in vivo pharmacological studies on the mentioned species.


2022 ◽  
Vol 11 ◽  
Author(s):  
Chenchen Sun ◽  
Xiaoxu Yang ◽  
Tianxiao Wang ◽  
Min Cheng ◽  
Yangyang Han

Biomechanics is a physical phenomenon which mainly related with deformation and movement of life forms. As a mechanical signal, it participates in the growth and development of many tissues and organs, including ovary. Mechanical signals not only participate in multiple processes in the ovary but also play a critical role in ovarian growth and normal physiological functions. Additionally, the involvement of mechanical signals has been found in ovarian cancer and other ovarian diseases, prompting us to focus on the roles of mechanical signals in the process of ovarian health to disease. This review mainly discusses the effects and signal transduction of biomechanics (including elastic force, shear force, compressive stress and tensile stress) in ovarian development as a regulatory signal, as well as in the pathological process of normal ovarian diseases and cancer. This review also aims to provide new research ideas for the further research and treatment of ovarian-related diseases.


2022 ◽  
Author(s):  
Stuart A. Newman

The origination and evolution of multicellular form and function is generally thought to be based on gene-based variation, with natural selection changing the populational composition in the respective variants over time. The criterion for evolutionary success is differential fitness, the relative capacity to leave progeny in the next generation. Theoretical considerations show that this model implies that phenotypic evolution will generally be gradual, based on variations of small effect. But the fossil record of early phylogenesis, notably for the metazoans, or animals, does not support the gradualist scenario. Moreover, discordances of phenotype and genotype in extant species, along with the existence of a pan-metazoan developmental genetic toolkit, does not support the gene-variation-based evolutionary mechanism, at least at the level of phyla. Most importantly, all life-forms, including the cells that constitute animal embryos, exhibit agency, and associations of cells (even constructed ones with no history of natural selection) exhibit novel kinds of agency. This strongly suggests that new multicellular forms can invent new ways of life (e.g., ecological niches) and can persist without supplanting their populational cohorts. This chapter describes how anatomical (e.g., segments, appendages) and functional (e.g., muscle, nerve) phenotypes can emerge without cycles of gradual selection from inherent properties of metazoan cells and their aggregates. While such phenotypic “add-ons” could provide enablements for exploration of new niches, it is implausible that they arose as adaptations to external challenges. Reproductive fitness, which is essential for understanding biogeography and ecology, is unlikely to have played a role in phylum-level evolution.


Author(s):  
José Jorge Gutiérrez-Samperio

<p>Pests, in their broad sense, have played an important part in the history of humankind. We could say that humans, crops and pests have walked together through life. Codices, glyphs, paintings and countless ancient documents, including the Bible and the Koran, bear witness to this. Humanity has been attacked by its own diseases, but also by those that limit them from obtaining food and deteriorate the environment. COVID-19, which is now troubling us and was declared a pandemic by the World Health Organization in March of 2020, became a part of the list of experiences we have suffered in the past, with pests or epidemics that caused millions of deaths by diseases or famines. It is paradoxical that this health contingency occurs when the United Nations General Assembly, on December 20th, 2018, in its resolution A/RES/73/252 decides to declare 2020 the International Year of Plant Health in order to “highlight the importance of plant health to improve food security, protect the environment and biodiversity and boost economic development” according to the pronouncement by the FAO. For the first time, in an era with great technological and scientific breakthroughs, humanity was aware of its vulnerability against the inevitable evolution of life forms in the face of dilemmas global impact caused by human beings. Thus, the pest or parasite makes its own declaration of existential preeminence through SARS-CoV-2 to remind us that the health of humans or plants is the essence of life and its continuity. But perhaps absolute health is not enough. It is necessary to find a balance in a world overwhelmed by giving so much in return for almost nothing to everyone living on it. If the sensor of our anthropocentric intervention of the world is climate change, then biological chaos is a masterpiece. The reemergence of pests and diseases considered eradicated, or those of zoonotic origin that had never accompanied our existence is a surreal dystopia that we will never be able to deny again.</p>


2022 ◽  
Vol 19 (1) ◽  
pp. 1-27
Author(s):  
Roberto Velázquez-Ochoa ◽  
María Julia Ochoa-Izaguirre ◽  
Martín Federico Soto-Jiménez

Abstract. The isotopic composition of carbon in macroalgae (δ13C) is highly variable, and its prediction is complex concerning terrestrial plants. The determinants of δ13C macroalgal variations were analyzed in a large stock of specimens that vary in taxa and morphology and were collected in shallow marine habitats in the Gulf of California (GC) with distinctive environmental conditions. A large δ13C variability (−34.6 ‰ to −2.2 ‰) was observed. Life-forms (taxonomy 57 %, morphology and structural organization 34 %) explain the variability related to carbon use physiology. Environmental conditions influenced the δ13C macroalgal values but did not change the physiology, which is most likely inherently species-specific. Values of δ13C were used as indicators of the presence or absence of carbon concentrating mechanisms (CCMs) and as integrative values of the isotope discrimination during carbon assimilation in the life cycle macroalgae. Based on δ13C signals, macroalgae were classified in three strategies relative to the capacity of CCM: (1) HCO3- uptake (δ13C > −10 ‰), (2) using a mix of CO2 and HCO3- uptake (-10<δ13C > −30 ‰), and (3) CO2 diffusive entry (δ13C < −30 ‰). Most species showed a δ13C that indicates a CCM using a mix of CO2 and HCO3- uptake. HCO3- uptake is also widespread among GC macroalgae, with many Ochrophyta species. Few species belonging to Rhodophyta relied on CO2 diffusive entry exclusively, while calcifying macroalgae species using HCO3- included only Amphiroa and Jania. The isotopic signature evidenced the activity of CCM, but it was inconclusive about the preferential uptake of HCO3- and CO2 in photosynthesis and the CCM type expressed in macroalgae. In the study of carbon use strategies, diverse, species-specific, and complementary techniques to the isotopic tools are required.


2022 ◽  
pp. 1229-1255
Author(s):  
Trinath Biswal

Climate change can disturb the characteristics of the soil either indirectly, or directly, or both. The direct effects include changes in the soil properties and composition by organic carbon transformation, precipitation, temperature, and % of moisture. The indirect impact includes nutrient cycling, improved soil erosion rate due to an increase in rate and intensity of rainfall, irrigation facility, changes in the crop rotation, and spadework practices. The presence of soil organic carbon (SOC) greatly influenced by the climatic condition. The crop cultivation depends upon the exchange of carbon between the troposphere and soil, which also vastly influences the fertility of the soil. The use, development, and management of soil depend upon soil structure, soil texture, soil stability, water holding capacity of the soil, availability of the nutrients, and erosion of the soil. Hence, deterioration of soil fertility by climatic change may affect the several soil lifeforms like fauna and flora either directly, or indirectly through nutritional value of the soil.


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