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Khan, Muhammad Aaqil,Hamayun, Muhammad,Iqbal, Amjad,Khan, Sumera Afzal,Hussain, Anwar,Asaf, Sajjad,Khan, Abdul Latif,Yun, Byung-Wook,Lee, In-Jung Portland Press Ltd. 2018 Biochemical journal Vol.475 No.18
<P>Flooding is an abiotic stress that creates hypoxic conditions triggered by redox potential leading to restricted growth and grain yield in plants. In the current study, we have investigated the effect of exogenous gibberellins (GA(4+7)) on soybean under flooding stress. A regulatory role of GAs on biochemical changes in soybean plants [including chlorophyll contents, endogenous bioactive GA(1) and GA(4), endogenous jasmonic acid (JA) and abscisic acid (ABA)] has been elucidated after 3 and 6 h of flooding stress. The modulation of stress-related bio-chemicals and their genetic determinants [for instance, ABA (Timing of CAB expression1-TOC1, ABA-receptor-ABAR) and NO (S-nitrosoglutathione reductase-GSNOR1, NO overproducer1-NOX, and nitrite reductase-NR)] in response to short-term flooding stress were also explored. The current study showed that exogenous GAs rescued chlorophyll contents, enhanced endogenous bioactive GA(1) and GA(4) levels, endogenous jasmonic acid (JA) and checked the rate of ABA biosynthesis under short-term flooding. The exo-GAs induced the glutathione activity and reduced the resulting superoxide anion contents during short-term flooding in Pungsannamul soybean. Exo-GAs also triggered the endogenous S-nitrosothiols (precursor for increased NO production) that have been decreased over the time. Moreover, the exo-GAs could impinge a variety of biochemical and transcriptional programs that are ameliorative to plant growth during short-term flooding stress. The presence of GA(1) and GA(4) also confirms the presence of both C13-hydroxylation pathway and non-C13-hydroxylation pathway in soybean, respectively.</P>
Khan, Aftab Ahmad,Khan, Imtiaz Afzal,Siyal, Muhammad Irfan,Lee, Chang-Kyu,Kim, Jong-Oh Elsevier 2019 Environmental research Vol.170 No.-
<P><B>Abstract</B></P> <P>The goal of this study was to prepare a robust anti-wetting and anti-fouling polyethersulfone (PES) membrane for the rejection of a highly saline (NaCl and CaCl<SUB>2</SUB>·2H<SUB>2</SUB>O) feed solution containing humic acid (HA) in direct contact membrane distillation (DCMD). Response surface methodology (RSM) was used to determine the optimum formulation of the used materials. The variable factors selected were polydimethyl siloxane (PDMS) and silica (SiO<SUB>2</SUB>); liquid entry pressure (LEP) and contact angle (CA) were selected as responses. Scanning electron microscopy (SEM) analysis confirmed the SiO<SUB>2</SUB> deposition and Fourier-transform infrared spectroscopy (FTIR) test evidenced the new functional groups i.e., Si–OH, siloxane, and C–F bond vibrations at 3446, 1099 cm<SUP>−1</SUP>, and 1150–1240 cm<SUP>−1</SUP> respectively on the membrane surface. The average roughness (Ra) was increased four times for the coated membranes (0.202–0.242 µm) as compared to that for pristine PES membrane (0.053 µm). The optimum PES-13 membrane exhibited consistent flux of 12 LMH and salt rejection (> 99%) with anti-fouling characteristic in DCMD using the feed solution of 3.5 wt% NaCl + 10 mM CaCl<SUB>2</SUB>·2H<SUB>2</SUB>O + 10 mg L<SUP>−1</SUP> HA. The PES-13 membrane may therefore be a key membrane for application in DCMD against CaCl<SUB>2</SUB>·2H<SUB>2</SUB>O-containing salty solutions with HA.</P> <P><B>Highlights</B></P> <P> <UL> <LI> PES membrane was prepared for application in DCMD using silica nanoparticles. </LI> <LI> Response surface methodology was employed to optimize the coating formulation. </LI> <LI> Modified membranes were resistant to fouling against calcium-humic acid feed. </LI> <LI> The high fluxes for PES-13 membrane were recorded with all three feed solutions. </LI> </UL> </P>
Sumera Afzal Khan,Muhammad Hamayun,Soon-Ok Rim(임순옥),In-Jung Lee(이인중),Jong-Chul Seu(서종철),Yeon-Sik Choo(추연식),Ing-Nyol Jin(진익렬),Sang-Dal Kim(김상달),In-Koo Lee(이인구),Jong-Guk Kim(김종국) 한국생명과학회 2008 생명과학회지 Vol.18 No.10
내생성 진균류는 초본류의 식물체 내에 주로 서식하며, 식물의 병원균으로부터 숙주를 보호할 뿐만 아니라, 식물 생육에 유리하게 작용하는 다양한 대사 산물을 생산한다. 매우 흔히 접할 수 있는 사구식물의 뿌리로부터 49종의 균류를 분리하여 식물 생장 촉진 활성이 있는 균주를 선별하였다. 결과적으로 37균주(75.5%)는 awito-c벼의 생육을 촉진하였으며, 11균주(22.5%)는 생육을 저해하였으며, 1균주(2%)는 생육에 아무런 영향을 미치지 않았다. Gibberella fujikuroi와 증류수 및 Czapek broth 배지를 control 로 사용하여 실험을 수행하였다. 결론적으로 사구식물 내생균류의 많은 부분은 숙주식물의 생육과 발달을 조장하는 대사 산물을 생산함을 알 수 있었다. Endophytic fungi predominantly inhabit grasses, and produce a variety of beneficial metabolites for plant growth, as well as help their hosts against pathogens and herbivores. Current study was focused on plant growth promoting activity of endophytic fungi inhabited in the roots of sand dune grasses. We collected 49 fungal isolates from the roots of four most common sand dune grasses and screened them for their growth promoting capacity. Results showed that 37 fungal isolates (75.5%) promoted plant height and shoot length of waito-c rice, 11 fungal isolates (22.5%) suppressed it, while 1 fungus (2%) showed no effect on the growth attributes. The fungal strain Gibberella fujikuroi, along with distilled water and Czapek broth medium, were taken as control for this experiment. It was concluded that a major proportion of endophytic fungi inhabited in the sand dune plants produce metabolites, and thus help in growth and development of the host plant.