Phenotypic plasticity and ecotypic variations in growth and flowering time of Arabidopsis thaliana (L.) under different light and temperature conditions.

Four ecotypes of A. thaliana (L.) (Ct-1, Pf-0, Old-1 and Per-1) from low to high latitudes were grown under different light (300 mmol photon m-2s-1 and 150 mmol photon m-2s-1) and temperature (22 and 14 ºC) conditions to investigate their effects on phenotypic plasticity and ecotypic variations in plant growth and first flowering time. The results suggest that in A. thaliana low temperature decreases both phenotypic plasticity and ecotypic variations in first flowering time and total dry matter at final harvest under different light intensities. Relative growth rate is the most stable parameter of A. thaliana that is hardly affected by ecotype (no effect), light (no effect) or temperature (small effect) and this may one of the reason why A. thaliana is widely distributed on earth as a result of adaptations to different environments.

Two main tropane alkaloids variations of black henbane [hyoscyamus niger] under pgprs inoculation and water deficit stress induction at flowering stage

Plants infection with microorganisms as well as physical factors such as osmotic stresses especially drought stress induced particular secondary metabolite production. Plant root and shoot hyoscyamine [HYO] and scopolamine [SCO] variations were investigated under three water deficit stress [WDS] levels as 30 [W1], 60 [W2] and 90% [W3] water depletion of field capacity and Pseudomonas putida [PP] and P. fluoresence [PF] strains inoculation at flowering stage. Seedling radicles and culture media were inoculated with PP and PF [10[9] CFU/ml] strains. Monitoring of soil moisture levels was conducted using gravimetric method. Alkaloids extracted were identified by gas chromatography [GC] and gas chromatography-mass spectrometry [GC-MS] analysis. Results revealed that HYO was the prevalent alkaloid in root and shoot organs. The highest ratio of SCO to HYO [0.53] and the highest alkaloids both HYO and SCO content in root and shoot was observed in W3PF treatment. The largest total alkaloids [HYO+SCO] yield [25.7 mg.plant[-1]] was showed in PP treated plants under W1 conditions. Integrative use of effective Pseudomonades strains and WDS sounds to be an encouraging and eco-friendly strategy for increasing tropane alkaloids yield and content in Hyoscyamus niger root and shoot parts

Macro and micromorphology of the aerial parts of Lantana montevidensis [spreng.] briq. cultivated in Egypt

Lantana montevidensis [Spreng.] Briq. is a member of family Verbenaceae, that includes about 98 genera and more than 2600 species which are predominantly tropical or subtropical plants. The leaf infusions of the plant are used in folk medicine to treat fever, influenza, asthma, bronchitis, and many other diseases. Biological studies showed that the plant has antimicrobial and antiproliferative activities. No detailed information could be traced concerning the macroand micromorphology of the plant. This motivated the authors to carry out this study to identify the drug in both entire and powdered form

Studies on chemical constituents in spikes of Schizonepeta tenuifolia / 中国中药杂志

<p><b>OBJECTIVE</b>To study the chemical constituents in the spikes of Schizonepeta tenuifolia.</p><p><b>METHOD</b>Compounds were isolated and purified with silica gel, ODS and Sephadex LH-20 gel column chromatography, and their structures were determined by using spectroscopic analysis including MS and NMR.</p><p><b>RESULT</b>Nine compounds were isolated and identified as 5, 7-dihydroxy-6, 4'-dimethoxyflavone (1), 5, 7-dihydroxy-6, 3', 4'-trimethoxyflavone (2), ursolic acid (3), 3-hydroxy-4(8)-ene-p-menthane-3(9)-lactone (4), 5, 7, 4'-trihydroxyflavone (5), 5, 4'-dihydroxy-7-methoxyflavone (6), hesperidin (7), luteolin (8) and daucesterol (9).</p><p><b>CONCLUSION</b>Compounds 1, 2, 6 were first obtained from the spikes of S. tenuifolia.</p>

Identification and expression analysis of EST-based genes in the bud of Lycoris longituba / 基因组蛋白质组与生物信息学报·英文版

To obtain a primary overview of gene diversity and expression pattern in Lycoris longituba, 4,992 ESTs (Expressed Sequence Tags) from L. longituba bud were sequenced and 4,687 cleaned ESTs were used for gene expression analysis. Clustered by the PHRAP program, 967 contigs and 1,343 singlets were obtained. Blast search showed that 179 contigs and 227 singlets (totally 1,066 ESTs) had homologues in GenBank and 3,621 ESTs were novel.