The antioxidant properties of honey are primarily associated with its phenolic composition and are greatly influenced by its botanical and geographical origin. In this study, the total phenolic content (TPC), total flavonoid content (TFC), antioxidant activity, and chemical characteristics of honey samples collected from different regions of Türkiye were determined using Fourier Transform Infrared (FTIR) spectroscopy and further evaluated through spectrophotometric analyses. Flower honey samples were obtained from Denizli (Servergazi/Sarayköy), Muğla (Doğançay), and Konya regions. TPC and TFC were determined using the Folin-Ciocalteu and aluminium chloride methods, respectively, while antioxidant activity was assessed by the DPPH radical scavenging assay. To identify functional groups related to carbohydrates and phenolic compounds, FTIR spectra were recorded in the 4000–400 cm⁻¹ range. The FTIR analysis revealed characteristic absorption bands corresponding to O–H, C–H, and C–O vibrational modes and confirmed compositional differences between samples. The results demonstrate that FTIR spectroscopy is a meaningful complementary technique for interpreting antioxidant-related compositional differences in honey samples from different geographical origins
This study evaluates the impact of salinity on the growth of Abelmoschus esculentus (okra) cultivated in Abraka, Delta State, Nigeria. Three concentrations of NaCl (90mM, 180mM, and 360mM) were applied to assess their effects on key growth parameters, including plant height, leaf number, leaf area, and stem girth. Using a controlled experimental setup with loamy soil and perforated bags, the treatments were administered over seven weeks. Results showed that increased salinity significantly reduced all measured growth parameters. High concentrations of NaCl led to stunted growth, decreased leaf production, and narrower stem girth, consistent with previous studies linking salinity stress to reduced photosynthesis, ion imbalance, and cellular dehydration. The study highlights the sensitivity of okra plants to salinity stress, particularly at higher NaCl concentrations, emphasizing its impact on yield and physiological traits. These findings provide insights into the tolerance levels of okra under saline conditions, contributing to sustainable agricultural practices in areas affected by salinity. Recommendations include exploring mitigation strategies such as soil amendments and the use of salt-tolerant cultivars to improve okra production in salt-prone regions.
UbiA membrane-bound aromatic prenyltransferases（UbiA PTs） catalyze the transfer of prenyl moieties to aromatic acceptor molecules to form C-C or C-O bonds, and participate in the biosynthesis of important plant chemicals, including ubiquinone, plastoquinone, chlorophyll, and tocopherol. A variety of aromatic secondary metabolites with prenyl groups in plants are also products of this class of enzyme. The introduction of prenyl groups increases the structural diversity and biological activity of natural products. In this paper, we introduce the basic types of UbiA families in plants, summarize the substrate selectivity and catalytic characteristics of 57 UbiA PTs related to biosynthesis of secondary metabolites（flavonoids, coumarins, stilbenes）,and discuss their phylogenetic relationship with primary metabolism-related PTs. We also discuss the exploration strategies of prenyltransferase genes and the application prospects of targeted synthesis of active prenylated compounds by microbial metabolic engineering.
河口河岸带及海岸带植物易受到水淹和盐复合胁迫的影响.本研究设置水淹、盐(350 mmol/L)、水淹-盐复合胁迫(175 mmol/L)3种胁迫处理,比较水翁(Cleistocalyx operculatus(Roxb.)Merr.et Perry)和乌墨(Syzygium cumini(L.)Skeels)两种耐水淹能力较强的植物幼苗对不同胁迫的生理生态响应差异.结果显示,3种胁迫方式处理24 d后,均降低了两物种的株高增长量、叶面积、总生物量、根系活力、净光合速率(Pn)、蒸腾速率(Tr)、气孔导度(Gs)等指标,而相对电导率、过氧化物酶(POD)活性上升.水淹胁迫下,两物种胞间二氧化碳浓度(Ci)随时间的延长持续下降.盐、水淹-盐复合胁迫下,两物种Ci随时间的延长先降后升.此外,与水淹相比,水淹-盐复合胁迫显著降低了两物种的叶面积、总生物量、Pn、Tr、Gs,而根冠比、相对电导率、POD活性显著上升.与乌墨相比,水翁幼苗在水淹胁迫下能够形成不定根,具有较高的根系活力、光合作用效率、POD活性以及更小的膜损伤,耐水淹能力较强;而乌墨幼苗在盐、水淹-盐复合胁迫下相比水翁具有较高的叶面积、生物量、根系活力、Pn、Tr、Gs、超氧化物歧化酶、POD活性以及更低的丙二醛含量,耐盐能力较强.
本研究在中国科学院西双版纳植物园设置的500 m2 样地中对迁地栽培植物坡垒(Hopea hainanensis Merr.&Chun)种群进行调查,采用径级结构代替龄级结构分析坡垒种群的结构特征,同时编制了静态生命表,分析种群的存活率、死亡率及消失率.结果显示,迁地栽培的坡垒种群更新的苗木尚无大径级的个体;但栽培的坡垒大部分个体能开花结果及自然更新,且幼苗数量较多,幼苗密度为 19550 株/hm2,,占种群个体数的86.00%.静态生命表分析结果表明,坡垒种群Ⅱ龄级的个体死亡率最低,Ⅲ龄级的个体死亡率最高,种群存活曲线趋向于Deevey-Ⅲ型;死亡率和消失率变化趋势一致.研究结果表明,坡垒迁地保护取得了初步成功.此外,迁地栽培中应加强对幼苗、幼树的管理,有助于提高其成活率,更多的进入下一龄级的生长和种群的扩大.
