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Abdur, Rahim,Lee, Young Kyu,Jeong, Kyunghoon,Nam, Ho-Seok,Kim, Young-Ho,Kim, Jiyoung,Lee, Jaegab Elsevier 2015 Organic Electronics Vol.26 No.-
<P><B>Abstract</B></P> <P>Two types of source/drain (S/D) electrodes, formed of poly(3,4-ethylenedioxythiophene):<I>p</I>-toluenesulfonate (PEDOT:PTS) conducting polymer and Au, were fabricated and mounted on flexible pentacene transistors. Several properties of the S/D electrodes were investigated: the adhesion between electrode and pentacene, the failure induced by mechanical bending, the electrical properties including contact resistance, and the field-effect mobility. The measurement of adhesive force using a 90° peel tester revealed that the adhesive force of the pentacene–PEDOT:PTS interface was 200N/m, while that of Au–pentacene was too small to be measured. The poor adhesion between the Au and pentacene led to the local delamination of the Au film, starting at a strain of approximately 1% and with a rapid increase of delamination density with increasing strain. The strain-induced mechanical damage has a direct effect on contact resistance, which in turn degrades mobility. In contrast, no delamination is observed with the high adhesive force at the pentacene–PEDOT:PTS interface, which thus led to a slight increase of contact resistance and mobility with strain. Consequently, the pentacene–PEDOT:PTS contacts provide mechanical and electrical stability in flexible organic thin film transistors (OTFTs) under bending tests.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Mechanical and electrical stability of PEDOT:PTS and Au S/D OTFTs in flexible OTFTs under bending was studied. </LI> <LI> The poor adhesion between Au and pentacene led to the local delamination of the Au film. </LI> <LI> The straining-induced mechanical damage has a direct effect on contact resistance, which in turn degrades mobility. </LI> <LI> The pentacene–PEDOT:PTS contacts provide excellent mechanical and electrical stability in flexible OTFTs under bending tests. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Rahim, Md Abdur,Afrin, Khandker Shazia,Jung, Hee-Jeong,Kim, Hoy-Taek,Park, Jong-In,Hur, Yoonkang,Nou, Ill-Sup National Research Council of Canada, Conseil natio 2019 Genome Vol. No.
<P> Broccoli <I>(Brassica oleracea var. italica L.)</I> is a highly nutritious vegetable that typically forms pure green or purple florets. However, green broccoli florets sometimes accumulate slight purplish pigmentation in response environmental factors, decreasing their market value. In the present study, we aimed to develop molecular markers to distinguish broccoli genotypes as pure green or purplish floret color at the early seedling stage. Anthocyanins are known to be involved in the purple pigmentation in plants. The purplish broccoli lines were shown to accumulate purple pigmentation in the hypocotyls of very young seedlings; therefore, the expression profiles of the structural and regulatory genes of anthocyanin biosynthesis were analyzed in the hypocotyls using <I>qRT-PCR. BoPAL, BoDFR, BoMYB114, BoTT8, BoMYC1.1, BoMYC1.2,</I> and <I>BoTTG1</I> were identified as putative candidate genes responsible for the purple hypocotyl color. <I>BoTT8</I> was much more highly expressed in the purple than green hypocotyls; therefore, it was cloned and sequenced from various broccoli lines, revealing SNP and InDel variations between these genotypes. We tested four SNPs (G > A; A > T; G > C; T > G) in the first three exons and a 14-bp InDel (ATATTTATATATAT) in the <I>BoTT8</I> promoter in 51 broccoli genotypes, and we found these genetic variations could distinguish the green lines, purple lines, and F<SUB>1</SUB> hybrids. These novel molecular markers could be useful in broccoli breeding programs to develop a true green or purple broccoli cultivar. </P>
Khan, Abdur Rahim,Ullah, Ihsan,Khan, Abdul Latif,Park, Gun-Seok,Waqas, Muhammad,Hong, Sung-Jun,Jung, Byung Kwon,Kwak, Yunyoung,Lee, In-Jung,Shin, Jae-Ho Ecomed 2015 Environmental Science and Pollution Research Vol.22 No.18
<P>The growth of hyperaccumulator plants is often compromised by increased toxicity of metals like cadmium (Cd). However, extraction of such metals from the soil can be enhanced by endophytic microbial association. Present study was aimed to elucidate the potential of microbe-assisted Cd phytoextraction in hyperaccumulator Solanum nigrum plants and their interactions under varied Cd concentrations. An endophytic bacteria Serratia sp. RSC-14 was isolated from the roots of S. nigrum. In addition to Cd tolerance up to 4?mM, the RSC-14 exhibited phosphate solubilization and secreted plant growth-promoting phytohormones such as indole-3-acetic acid (54?μg/mL). S. nigrum plants were inoculated with RSC-14 and were grown in different concentrations of Cd (0, 10, and 30?mg Cd?kg(-1) sand). Results revealed that Cd treatment caused significant cessation in plant growth, biomass, and chlorophyll content, whereas significantly higher malondialdehyde (MDA) and electrolyte production in leaves were observed in a dose-dependent manner. Conversely, RSC-14 inoculation relived the toxic effects of Cd-induced stress by significantly increasing root/shoot growth, biomass production, and chlorophyll content and decreasing MDA and electrolytes contents. Ameliorative effects on host growth were also observed by the regulation of metal-induced oxidative stress enzymes such as catalase, peroxidase, and polyphenol peroxidase. Activities of these enzymes were significantly reduced in RSC-14 inoculated plants as compared to control plants under Cd treatments. The lower activities of stress responsive enzymes suggest modulation of Cd stress by RSC-14. The current findings support the beneficial uses of Serratia sp. RSC-14 in improving the phytoextraction abilities of S. nigrum plants in Cd contamination.</P>
Plant growth-promoting potential of endophytic fungi isolated from Solanum nigrum leaves.
Khan, Abdur Rahim,Ullah, Ihsan,Waqas, Muhammad,Shahzad, Raheem,Hong, Sung-Jun,Park, Gun-Seok,Jung, Byung Kwon,Lee, In-Jung,Shin, Jae-Ho Springer 2015 World journal of microbiology biotechnology Vol.31 No.9
<P>Fungal endophytes have been characterized as producers of phytohormones and potent promoters of plant growth. In this study, two fungal endophytes, Fusarium tricinctum RSF-4L and Alternaria alternata RSF-6L, were isolated from the leaves of Solanum nigrum. Culture filtrates (CFs) from each isolate were initially screened for indole compounds, and assayed for their ability to promote the growth of Dongjin rice plants. Nearly all plant growth attributes examined (i.e., chlorophyll content, root-shoot length, and biomass production) were significantly enhanced upon treatment with fungal CFs. Subsequently, gas chromatography/mass spectrometry analyses were utilized to confirm the presence of phytohormones in the CF of each fungal endophytic isolate. These analyses revealed that RSF-4L and RSF-6L produced 54 and 30??g/mL indole acetic acid, respectively, within their respective cultures. These findings suggest that the endophytes isolated in this study synthesize bioactive compounds that could play important roles in promoting plant growth.</P>
Md Abdur Rahim,Khandker Shazia Afrin,Hee-Jeong Jung,Hoy-Taek Kim,Jong-In Park,Ill-Sup Nou 한국원예학회 2021 Horticulture, Environment, and Biotechnology Vol.62 No.1
We explored the relationship between skin color and the expression of genes related to carotenoid biosynthesis during fruitripening in two citrus cultivars, ‘Shiranuhi’ (a hybrid mandarin cultivar) and ‘Suneat’ (mutant cultivar derived from a naturalbud mutation of ‘Shiranuhi’). We identifi ed 16 and 7 genes putatively involved in carotenoid biosynthesis and regulationvia phylogenetic analysis in sweet orange. Further, we determined the expression pattern of these genes by quantitative realtime reverse transcriptase PCR (qRT-PCR). The result showed that the expression levels of CsPSY (Cs6g15910), CsZDS(Cs3g11180), CsZ-ISO (Cs5g24730), CsBCH1 (Cs9g19270), CsFUL2 (Cs5g12280), CsTAGL1 (Cs7g16960), CsRIN1(Cs6g19680), CsRIN2 (Cs7g10980), and CsHY5 (Cs7g05140) were up-regulated in the skin of mutant cultivar ‘Suneat’ thanany other tissues of both citrus cultivars. Of these CsPSY , CsZDS , CsZ-ISO and CsBCH1 genes were related to carotenoidbiosynthesis and CsFUL2 , CsTAGL1 , CsRIN1 , CsRIN2 , and CsHY5 were known to involve in the regulation of carotenoidbiosynthesis. Our results reveal that the attractive dark orange skin color of ‘Suneat’ might be due to the up-regulation ofcarotenoid biosynthetic as well as regulatory genes and thereby higher levels carotenoids at ripening.
Md Abdur Rahim,AKM Zilani Rabbi,Khandker Shazia Afrin,정희정,Hoy-Taek Kim,박종인,노일섭 한국육종학회 2019 Plant Breeding and Biotechnology Vol.7 No.3
Cherry tomatoes are highly nutritious, flavory with a pleasant taste and are becoming increasingly popular to the consumers. The cherry tomato cv. ‘Minichal’ produced some dwarf plants along with normal plants. Lignin, a phenolic biopolymer is the key component of cell walls in plants. Here, we analyzed lignin biosynthesis-related genes in leaves, inflorescences and fruits of dwarf and normal cherry tomato plants by reverse-transcription quantitative PCR (RT-qPCR). Among analyzed genes, SlCCOAOMT1, SlCCOAOMT2, SlCCOAOMT3, SlF5H, and SlCOMT showed significantly higher expressions, in leaf and inflorescence of dwarf plants compared with the normal plants, while SlPAL1 showed a significantly higher expression only in the leaves. On the contrary, SlHCT and SlC3H showed significantly lower expression levels in the leaves and inflorescences of dwarf plants compared with normal ones. The results suggest that SlHCT and SlC3H might have an impact on the dwarf cherry tomato plants.