Background And Aims: Retranslocation of iron (Fe) from source tissues enhances plant tolerance to Fe deficiency. Previous work has shown that silicon (Si) can alleviate Fe deficiency by enhancing acquisition and root to shoot translocation of Fe. Here the role of Si in Fe mobilization in older leaves and the subsequent retranslocation of Fe to young leaves of cucumber (Cucumis sativus) plants growing under Fe-limiting conditions was investigated.
Methods: Iron ((57)Fe or naturally occurring isotopes) was measured in leaves at different positions on plants hydroponically growing with or without Si supply. In parallel, the concentration of the Fe chelator nicotianamine (NA) along with the expression of nicotianamine synthase (NAS) involved in its biosynthesis and the expression of yellow stripe-like (YSL) transcripts mediating Fe-NA transport were also determined.
Key Results: In plants not receiving Si, approximately half of the total Fe content remained in the oldest leaf. In contrast, Si-treated plants showed an almost even Fe distribution among leaves with four different developmental stages, thus providing evidence of enhanced Fe remobilization from source leaves. This Si-stimulated Fe export was paralleled by an increased NA accumulation and expression of the YSL1 transporter for phloem loading/unloading of the Fe-NA complex.
Conclusions: The results suggest that Si enhances remobilization of Fe from older to younger leaves by a more efficient NA-mediated Fe transport via the phloem. In addition, from this and previous work, a model is proposed of how Si acts to improve Fe homeostasis under Fe deficiency in cucumber.
Download full-text PDF |
Source |
|---|---|
| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4970368 | PMC |
| http://dx.doi.org/10.1093/aob/mcw105 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
A UK population-based case-control study of blood tests before cancer diagnosis in patients with non-specific abdominal symptoms.
Br J Cancer
January 2025
Epidemiology of Cancer Healthcare & Outcomes (ECHO) Group, Department of Behavioural Science, Institute of Epidemiology and Health Care (IEHC), UCL, London, UK.
Background: Abnormal results in commonly used primary care blood tests could be early markers of cancer in patients presenting with non-specific abdominal symptoms.
Methods: Using linked data from the UK Clinical Practice Research Datalink (CPRD) and national cancer registry we compared blood test use and abnormal results from the 24-months pre-diagnosis in 10,575 cancer patients (any site), and 52,875 matched-controls aged ≥30 presenting, with abdominal pain or bloating to primary care.
Results: Cancer patients had two-fold increased odds of having a blood test (odds ratio(OR):1.
Transcriptomic Analysis of Effects of Developmental PCB Exposure in the Hypothalamus of Female Rats.
Mol Cell Endocrinol
January 2025
This study investigated the consequences of perinatal exposure to Aroclor 1221 (A1221), a weakly estrogenic polychlorinated biphenyl (PCB) mixture and known endocrine-disrupting chemical (EDC), in female rats. Previous work has shown behavioral and physiological effects of A1221, and the current study extended this work to comprehensive transcriptomic profiling of two hypothalamic regions involved in the control of reproduction: the arcuate nucleus (ARC) and anteroventral periventricular nucleus (AVPV). Female Sprague-Dawley rats were fed a cookie treated with a small volume of A1221 (1 mg/kg) or vehicle (3% DMSO in sesame oil) during pregnancy from gestational days 8-18 and after birth from postnatal (P) days 1-21, exposing the offspring via placental and lactational transfer.
View Article and Find Full Text PDFCognitive and neural basis of vigilance advantage in soccer players: evidence from the drift-diffusion model and magnetic resonance imaging.
Psychol Sport Exerc
January 2025
Department of magnetic resonance imaging, Beijing Shijitan Hospital, Capital Medical University, 100038 Beijing, China. Electronic address:
Soccer is a sport that requires athletes to be constantly aware of rapidly changing and unpredictable environments and to react adaptively. Previous studies have found that soccer players typically exhibit a vigilance advantage, but the underlying cognitive and neural basis for this is unclear. In this study, 27 soccer players, 17 age-matched artistic gymnasts, and 57 college students were recruited to participate in a psychomotor vigilance task.
View Article and Find Full Text PDFMolecular and phylogenetic analyses of the first complete genome sequence of Duck hepatitis A virus genotype 2 from India.
Gene
January 2025
National Institute of Animal Biotechnology, Hyderabad, Telangana 500032, India; Regional Center for Biotechnology (RCB), Faridabad, Haryana, India. Electronic address:
Duck viral hepatitis (DVH) caused by duck hepatitis A virus (DHAV) is a highly contagious and economically important disease of ducklings worldwide. In many parts of the globe, disease outbreaks are reported in spite of vaccinations, probably due to antigenic diversity among DHAV genotypes. We previously reported the first isolation of DHAV-2 (Genotype -2) from ducklings in Tamil Nadu, India.
View Article and Find Full Text PDFA POCIS-based approach for the monitoring of pharmaceuticals in wastewater treatment plants: Calibration and deployment challenges.
Environ Pollut
January 2025
Department of Analytical and Applied Chemistry, School of Engineering, IQS-Universitat Ramon Llull, Via Augusta 390, 08017 Barcelona, Spain.
The impact of pharmaceuticals in aquatic environments requires complementary monitoring techniques to the more conventional grab sampling approach for an improved sample representativity. This study explores the application of Polar Organic Chemical Integrative Samplers (POCIS) in the analysis of a wide range of pharmaceutical residues in wastewater effluent, highlighting its advantages over grab sampling. Passive sampling techniques, extending sampling duration several days or weeks, provide continuous and representative data, improving the punctual nature of grab sampling.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!