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Location of chlorophyllZ in photosystem II.

Saturation-recovery and progressive microwave power saturation EPR spectroscopies have been used to probe the location of the chlorophyllZ+ (ChlZ+) radical species in Mn-depleted photosystems II (PSII). The spin-lattice relaxation transients of ChlZ+ were non-single-exponential due to a dipole-dipole interaction with one of the other paramagnetic centers in PSII. Measurements on CN(-)-treated, Mn-depleted PSII membrane samples, in which the non-heme Fe(II) is converted into its low-spin, diamagnetic form, confirmed that the non-heme Fe(II) caused the dipolar relaxation enhancement of ChlZ+. Th

Organic-chemical fertilizer combination enhances maize yield through coordinated regulation of leaf C-N metabolism, photosynthesis and dry matter partitioning in northeast black soil, China.

Aiming at how organic fertilizer regulates the growth and development of maize in the Northeast black soil region, and to explore sustainable nutrient management models, this study aims to investigate how it regulates the photosynthetic physiological characteristics, leaf senescence dynamics, dry matter accumulation and translocation, grain filling characteristics, and final yield formation of maize. A long-term field trial was conducted using maize cultivar Jingnongke 728, with five treatments: conventional fertilization (CK), full substitution of chemical fertilizer with organic fertilizer,

Isolation and characterization of PGPR obtained from different arsenic-contaminated soil samples and their effect on photosynthetic characters of maize grown under arsenic stress.

Contamination of the environment due to speedup of anthropogenic activities has become a serious threat to modern humanity. Among the contaminants, the new emerging concern is the heavy metal (HM) contamination in the environment. Because the persistence and harmfulness of heavy metals affect the ecosystem and the health of plants, animals, and humans, they are the most toxic substances in the environment. Among them, Arsenic (As) emerged as major environmental constraint leading to enormous negative effects on the plant, animal, and human health. Even in minute quantity, As is known to cause

Deciphering the immunomodulatory mechanisms of Periplaneta americana L. extract CII-3: insight from integrated metabolomics and network pharmacology.

BACKGROUND: Periplaneta americana L. is one of the most famous traditional Chinese medicines (TCMs), and CII-3 is the major bioactive extract of Periplaneta americana L. In recent years, CII-3 has gradually attracted the attention of researchers for its powerful capacity for treating immunocompromised diseases. However, systematical chemical composition investigation and mechanisms on immunomodulation of CII-3 have not been thoroughly scrutinized. METHODS: The chemical ingredients of CII-3 were determined by ultra-performance liquid chromatography tandem quadrupole time-of-flight mass spectro

[CD4+ and CD8+ T cells in gastric mucosa in children infected with Helicobacter pylori].

OBJECTIVE: To study the changes of gastric mucosal CD4(+) and CD8(+) T cells in Helicobacter pylori (Hp) infected children. METHODS: Seventy nine patients with digestive tract symptoms were assessed by endoscopy, rapid urease test and histology. Forty four patients had Hp positive chronic superficial gastritis (Hp(+)CSG) and 35 patients had Hp negative chronic superficial gastritis (Hp(-)CSG). Gastric biopsy specimens were obtained from each patient. Peripheral blood samples were obtained from 33 patients (12 with Hp(+)CSG, 21 with Hp(-)CSG). Hp infection was identified by rapid urease test a

Multi-trait phenotyping under reproductive-stage heat stress reveals heritable reproductive and yield indicators of tolerance in common bean (Phaseolus vulgaris L.).

Common bean (Phaseolus vulgaris L.) exhibits significant susceptibility to heat stress during its reproductive phase. However, the physiological and reproductive traits underlying heat tolerance remain inadequately characterised across diverse bean germplasm. In this study, 56 accessions were assessed under controlled heat stress conditions (32/22 °C day/night) and optimal conditions (25/15 °C) during the flowering-to-podding stage over a seven-day period across two consecutive growing seasons (2023 and 2024). Seventeen traits encompassing phenological, growth, physiological, reproductive, and

Physiological, Biochemical, and Transcriptomic Responses to Iron Deficiency in Two Potato Varieties.

This study aimed to elucidate the physiological, biochemical, and transcriptional regulatory responses of potato plants to iron deficiency stress. Two potato varieties were selected for analysis: 05P (high tuber iron content) and CI5 (low tuber iron content). Tissue culture seedlings of both varieties were subjected to iron deficiency, and the effects on stem length, root length, fresh weight, soluble sugar and protein contents, as well as the activities of superoxide dismutase (SOD), peroxidase (POD), malondialdehyde (MDA), and leaf chlorophyll content (SPAD) values were evaluated. Additional

Based on Serum Pharmacochemistry and Metabolomics Studied the Pharmacodynamic Material Basis and Mechanism of Rubi Fructus (Fupenzi) in Improving the Symptom of Kidney-Yang Deficiency.

Rubi fructus (Fupenzi) is the immature fruit of East China Rubi fructus, which is widely used in medicine, food, health food and other fields. Since ancient times, Fupenzi has been considered to be an important medicine for tonifying the kidney in terms of nourishing the liver and kidney, fixing essence and reducing urine, but its effective components and mechanism are not clear. In this paper, the effective components of Rubi fructus were analyzed by detecting the components of Fupenzi in vivo and in vitro. Adenine was used to replicate the model of kidney yang deficiency, and organ index, bi

Effectiveness of Phosphate and Zinc Solubilizing Paenarthrobacter nitroguajacolicus P1 as Halotolerant Rhizobacterium with Growth-Promoting Activity on Pistacia vera L.

Plant growth-promoting rhizobacteria (PGPR) are beneficial microorganisms to develop microbial fertilizers. Biofertilizers can accelerate plant growth and enhance crop yields. The current research aimed to isolate and identify rhizobacterium with plant growth-promoting activity in the rhizospheric region of pistachio trees in arid and salty region of Iran. In the present study, 26 bacterial isolates were isolated from the rhizospheric region of the pistachio trees. Plant growth-promoting characteristics of isolated bacteria, including the ability to solubilize phosphate and zinc, produce hydro

Chalepin: isolated from Ruta angustifolia L. Pers induces mitochondrial mediated apoptosis in lung carcinoma cells.

BACKGROUND: Cancer has been one of the leading causes of mortality in this era. Ruta angustifolia L. Pers has been traditionally used as an abortifacient, antihelmintic, emmenagogue and ophthalmic. In Malaysia and Singapore, the local Chinese community used it for the treatment of cancer. METHODS: In this study, the methanol and fractionated extracts (hexane, chloroform, ethyl acetate and water) of R. angustifolia were tested for its cytotoxicity using the sulforhodamide (SRB) cytotoxicity assay against HCT-116, A549, Ca Ski and MRC5 cell lines. Chemical isolation was carried out by using the

Bioactive Components and Radical Scavenging Activity in Selected Advance Lines of Salt-Tolerant Vegetable Amaranth.

Four selected advance lines of salt-tolerant vegetable amaranth were evaluated for proximate, nutraceuticals, pigments, phytochemicals, and antioxidants components antioxidants activity in completely randomized block design (RCBD) design in three replicates. Salt-tolerant vegetable amaranth contained adequate carbohydrates, protein, moisture, and dietary fiber. The remarkable contents of iron, manganese, copper, zinc, sodium, molybdenum, boron, potassium, calcium, magnesium, phosphorus, sulfur, betacyanins, betalains, betaxanthins, chlorophylls, ascorbic acid, polyphenols, flavonoids, and anti

New insights into cadmium stressful-conditions: Role of ethylene on selenium-mediated antioxidant enzymes.

Cadmium (Cd) contamination has generated an environmental problem worldwide, leading to harmful effects on human health and damages to plant metabolism. Selenium (Se) is non essential for plants, however it can improve plant growth and reduce the adverse effects of abiotic stress. In addition, ethylene may interplay the positive effects of Se in plants. In order to investigate the role of ethylene in Se-modulation of antioxidant defence system in response to Cd-stress, we tested the hormonal mutant Epinastic (epi) with a subset of constitutive activation of the ethylene response and Micro-Tom

Impact of UV-A radiation on the performance of aphids and whiteflies and on the leaf chemistry of their host plants.

Ultraviolet (UV) radiation directly regulates a multitude of herbivore life processes, in addition to indirectly affecting insect success via changes in plant chemistry and morphogenesis. Here we looked at plant and insect (aphid and whitefly) exposure to supplemental UV-A radiation in the glasshouse environment and investigated effects on insect population growth. Glasshouse grown peppers and eggplants were grown from seed inside cages covered by novel plastic filters, one transparent and the other opaque to UV-A radiation. At a 10-true leaf stage for peppers (53 days) and 4-true leaf stage f

Анализ ассоциации геномов показывает новый QTL CsPC1 для перикарпового цвета в огурце.

Огурчик - это важная дыня в мире с разными перикарными цветами. Однако потенциальные гены и основополагающий генетический механизм для такой важной черты огурца неизвестны. В этом исследовании на хромосоме был найден цвет колокольчика, контролирующего перикарп 3 генома огурцов. Результаты: В этом исследовании светло-зеленая линия G35 и темно-зеленая линия Q51 были пересечены для производства one Население F2. Таким образом, мы определили крупное цокольное поле CsPC1 (Перикарный цвет) 1). Далее мы нарисовали строку CsPC1 94-kb районная хромосома 3 который содержит 15 Гены. Среди этих генов Csa3

Совпадение в полном тексте источника
… Pigment content analysis showed that chlorophyll a and chlorophyll b contents were significantly lower in G35 than in Q51. However, there was no significant difference in carotenoid content (Fig. 1 b). … Chlorophyll a and chlorophyll b were extracted from pericarps of G35, Q51, and F 1 progeny with ethyl alcohol and quantified by a spectrophotometric method. …

Interactions between ScNAC23 and ScGAI regulate GA-mediated flowering and senescence in sugarcane.

Control of gene transcription is crucial to regulate plant growth and development events, such as flowering, leaf senescence, and seed germination. Here we identified a NAC transcription factor (ScNAC23) isolated from sugarcane (cv. ROC22). Analysis by qRT-PCR indicated that ScNAC23 expression was strongly induced in mature leaves and flowering varieties and was also responsive to exogenous treatment with the hormone gibberellin (GA). Ectopic expression of ScNAC23 in Arabidopsis accelerated bolting, flowering, and leaf senescence compared to wild type plants. Furthermore, Arabidopsis overexpre

Population pharmacokinetics of the photodynamic therapy agent 2-[1-hexyloxyethyl]-2-devinyl pyropheophorbide-a in cancer patients.

Photodynamic therapy is an effective and often curative treatment for certain solid tumors. The porphyrin-based photosensitizer Photofrin, the only Food and Drug Administration-approved drug for this therapy, suffers from certain disadvantages: its complex chemical nature; retention by skin (leading to protracted cutaneous photosensitivity); and less than optimal photophysical properties. In this study, we examine the population pharmacokinetics and cutaneous phototoxicity of 2-[1-hexyloxyethyl]-2-devinyl pyropheophorbide-a (HPPH), a chlorin-type photosensitizer with more favorable photophysic

A new ABC half-transporter in Leishmania major is involved in resistance to antimony.

The characterization of ABCI4, a new intracellular ATP-binding cassette (ABC) half-transporter in Leishmania major, is described. We show that ABCI4 is involved in heavy metal export, thereby conferring resistance to Pentostam, to Sb(III), and to As(III) and Cd(II). Parasites overexpressing ABCI4 showed a lower mitochondrial toxic effect of antimony by decreasing reactive oxygen species production and maintained higher values of both the mitochondrial electrochemical potential and total ATP levels with respect to controls. The ABCI4 half-transporter forms homodimers as determined by a coimmuno

Antioxidant enzyme activities and hormonal status in response to Cd stress in the wetland halophyte Kosteletzkya virginica under saline conditions.

Salt marshes constitute major sinks for heavy metal accumulation but the precise impact of salinity on heavy metal toxicity for halophyte plant species remains largely unknown. Young seedlings of Kosteletzkya virginica were exposed during 3 weeks in nutrient solution to Cd 5 µM in the presence or absence of 50 mM NaCl. Cadmium (Cd) reduced growth and shoot water content and had major detrimental effect on maximum quantum efficiency (F(v) /F(m) ), effective quantum yield of photosystem II (Y(II)) and electron transport rates (ETRs). Cd induced an oxidative stress in relation to an increase in O

Cyanobacterium Microcoleus in toxic benthic mats on different streambed substrates: Ecophysiology and important metabolic pathways.

Benthic cyanobacteria, notably the genus Microcoleus, are a common contributor to benthic harmful algal blooms globally and can produce neurotoxins. Microcoleus can thrive in nutrient-limited freshwater environments, which present significant environmental and public health challenges. In May 2023, we observed Microcoleus mat growing in a small tributary of the Virgin River in Zion National Park near the Temple of Sinawava and collected benthic mats from three rock and three sandy substrate (strata) sites in the Virgin River. The overall objective of this study was to evaluate the effect of th

Screening of salt tolerance of maize (Zea mays L.) lines using membership function value and GGE biplot analysis.

Soil salinization is a widely recognized global environmental concern that has a significant impact on the sustainable development of agricu … x major components including germination vigor, peroxidase (POD), plant height, embryo length, SPAD chlorophyll and proline (PRO) factors. After calculating the comprehensive index (D value) of each variety's performance in different environments using principal component analysis and the membership function method, a GGE biplot analysis was conducted to identi …