Reversible stimuli-responsive luminescence of bimetallic cuprous complexes based on NH-deprotonated 3-(2′-pyridyl)pyrazole

Color regulation of solid-state luminescence is desirable and challenging. Herein we report two new three- and four-coordinate bimetallic cuprous complexes 1 and 2, which bear a NH-deprotonated 3-(2′-pyridyl)pyrazole adopting monoanionic...

Luminescence property improvement and controllable color regulation of novel Bi3+ doped Ca2Ta2O7 green phosphor through charge compensation engineering and energy transfer

In pursuit of warm WLEDs, exploration of novel phosphors and regulation of the existing phosphors are the two approaches usually used in the luminescent material field. In this work, we...

Integrated analyses of rice dark response and leaf color regulation reveal links with porphyrin and chlorophyll metabolism

Background Light is a key regulatory signal for rice growth and development. Under dark stress, rice shows leaf yellowing. Whole genome transcriptomic analysis will identify differentially expressed genes (DEG) in dark-treated rice seedlings and DEG-enriched metabolic pathways. Rice leaf color is an essential agronomic trait. Traditional genetic experiments have reported over a hundred of leaf color-related (LCR) genes and some of them were also regulated by light signal. Thus, an integrated analysis for the two set of data will be helpful for illustration of the mechanism for both dark-response and leaf color regulation. Results Transcriptome changes in response to dark treatment were surveyed by RNA-Seq analysis. About 13,115 DEGs were identified. One hundred and fifty rice LCR genes were collected. It was found that 102 LCR genes (68.0%) were also dark-response DEGs, which suggests an overlap between dark response and LCR networks. Fifty DEG overlapped LCR genes was associated with chloroplast development. KEGG analysis revealed enrichment of LCR genes in porphyrin and chlorophyll metabolism (PCM) (18/44, 40.9%). Of the 18 LCR genes in the PCM pathway, 15 were dark-response DEGs (83.3%). More interestingly, most of them are involved in a central PCM sub-pathway, chlorophyll biosynthesis. Conclusions Integrated analysis for dark stress-response and leaf color regulation identified the correlation between the two processes and mutually supported evidences were obtained. It was found that PCM pathway, particularly chlorophyll biosynthesis process, is a core component of the overlap and plays important roles in rice LCR and dark stress-response. This study provides important clues for identifying additional LCR genes, understanding the mechanisms of dark response and leaf color regulation.

Highly stable 3D porous HMOF with enhanced catalysis and fine color regulation by the combination of d- and p-ions when compared with those of its monometallic MOFs

Three comparable MOFs were yielded successfully. Among them, the highly stable HMOF is a porous 3D motif with lots of active sites, leading to the enhanced catalysis for CO2 conversion and fine color regulations of MOFs by doping different ions.

Transcriptome-Wide Analysis Reveals Key DEGs in Flower Color Regulation of Hosta plantaginea (Lam.) Aschers

Background: Hosta plantaginea (Lam.) Aschers (HPA), a species in the family Liliaceae, is an important landscaping plant and herbaceous ornamental flower. However, because the flower has only two colors, white and purple, color matching applications are extremely limited. To date, the mechanism underlying flower color regulation remains unclear. Methods: In this study, the transcriptomes of three cultivars—H. plantaginea (HP, white flower), H. Cathayana (HC, purple flower), and H. plantaginea ‘Summer Fragrance’ (HS, purple flower)—at three flowering stages (bud stage, initial stage, and late flowering stage) were sequenced with the Illumina HiSeq 2000 (San Diego, CA, USA). The RNA-Seq results were validated by qRT-PCR of eight differentially expressed genes (DEGs). Then, we further analyzed the relationship between anthocyanidin synthase (ANS), chalcone synthase (CHS), and P450 and the flower color regulation by Gene Ontology (GO), Kyoto Encyclopedia of Genes and Genomes (KEGG), and Eukaryotic Orthologous Groups (KOG) network and pathway enrichment analyses. The overexpression of CHS and ANS in transgenic tobacco petals was verified using qRT-PCR, and the petal colors associated with the overexpression lines were confirmed using absorbance values. Results: Over 434,349 transcripts were isolated, and 302,832 unigenes were identified. Additionally, through transcriptome comparisons, 2098, 722, and 606 DEGs between the different stages were found for HP, HC, and HS, respectively. Furthermore, GO and KEGG pathway analyses showed that 84 color-related DEGs were enriched in 22 pathways. In particular, the flavonoid biosynthetic pathway, regulated by CHS, ANS, and the cytochrome P450-type monooxygenase gene, was upregulated in both purple flower varieties in the late flowering stage. In contrast, this gene was hardly expressed in the white flower variety, which was verified in the CHS and ANS overexpression transgenic tobacco petals. Conclusions: The results suggest that CHS, ANS, and the cytochrome P450s-regulated flavonoid biosynthetic pathway might play key roles in the regulation of flower color in HPA. These insights into the mechanism of flower color regulation could be used to guide artificial breeding of polychrome varieties of ornamental flowers.