Search results for "botany"

Phenolic Compounds from Lactuca viminea L.

1992

Abstract The aerial part of Lactuca viminea L. was examined for the presence of phenolic compounds. Six different flavonoids were isolated and identified by UV spectra, TLC, HPLCDAD , 1H NMR and 13C NMR. They were identified as apigenin, luteolin, quercetin, luteolin-7-O-glucoside, quercetin-3-O-glucoside and luteolin-7-O-glucuronide-6″methyl ester. Three phenolic acids were also detected: caffeic, ferulic and chlorogenic acid.

THE INHIBITORY EFFECT OF THE PLANT KALANCHOE PINNATA AND ITS FLAVONOID QUERCETIN ON AIRWAY HYPERRESPOSIVENESS

2010

Cardenolide variation within and among natural populations of Digitalis obscura

1999

Summary Cardenolide content in 49 wild-growing Digitalis obscura plants from six natural populations on the Iberian Peninsula was determined by HPLC. Series A and B glycosides were the predominant cardenolides in all samples, but absolute values varied among and within populations. Hierarchic analysis of variance showed that the proportion of variation attributable to individuals was significantly higher than that attributable to population differences. Furthermore, analyses from greenhouse-grown plants, generated from seeds collected from selected parental genotypes, attributed nearly all the variability in cardenolide content to single plants. Some individual plants showed a leaf content …

Fatty acid composition of the seed lipids ofChamaerops humilisL. natural populations and its relation with the environment

2014

Seed lipids composition is a tool to discriminate among plant taxa and is related to phylogeny and biogeographic distribution. Aim of the present study was to evaluate the fatty acid (FA) composition of the seed lipids from nine natural Chamaerops humilis L. population and its relation with the climatic traits of the collection sites. The average seed lipids content was 54.8 g kg21 and the most represented FAs were oleic (478 g kg21 oil) and linoleic (230 g kg21 oil), with significant differences among the accessions. Most of the lipid traits significantly correlated with climatic traits. In particular, oleic acid negatively correlated with year potential evapotranspiration. These relations…

Production of the Phytoalexin Resveratrol by Grapes as a Response to Botrytis Attack Under Natural Conditions

1995

Le resveratrol (3,5,4'-trihydroxystilbene) est un des mebolites de stress produit par la vigne en reponse a une infection parasitaire ou une blessure. La distribution de cette molecule dans des lesions limitees causees par Botrytis cinerea sur des grappes de raisins a maturite au vignoble a ete etudiee. Le resveratrol est localise principalement dans les fruits sains entourant les zones infectees. Cette reponse localisee contribue a limiter l'extension du pathogene tant que les conditions climatiques lui sont defavorables. Lorsque les conditions deviennent favorables; c'est-a-dire apres une periode humide et chaude, une expansion rapide des lesions est alors observee sur les fruits en depit…

Morphogenesis in callus and single-cell cultures ofLavandula latifoliaMedicus

1990

Procedures and factors promoting plant regeneration from callus and isolated cells were investigated in Lavandula latifolia Medicus. Callus was obtained from cotyledon explants cultured on MS medium supplemented with 0.34 (xM 2,4-D. These calli regenerated adventitious buds when transferred to MS medium containing either BA or several auxin (IAA or NAA)/BA combinations, best results being obtained in the presence of 8.80 (mi BA alone or in combination with 0.06 and 0.60 (xM IAA or NAA. Single cells from cotyledon-derived calli were able to proliferate as callus when plated in MS medium supplemented with IAA or several IAA/BA combinations. Best plating efficiency was achieved when cells were…

Detection of the lunasin peptide in oats (Avena sativa L)

2013

We report the first discovery of lunasin in oats (Avena sativa L). Lunasin is a novel cancer preventive, anti-inflammatory and cholesterol-reducing peptide originally isolated from soy and later found in cereals (barley, rye, wheat, triticale). Lunasin was detected in oats using LC–MS/MS analysis. The chromatograms and mass spectra of lunasin isolated from five oat genotypes were compared with those of the synthetic lunasin peptide. We measured the lunasin content in harvests of two years and found that all tested oat genotypes contained the lunasin peptide. However, we observed genotype-related fluctuations in the lunasin content. Notably, the middle early oat variety ‘Ivory’ contained the…

In Vitro Propagation of Sideritis angustifolia Lag.

1987

Summary Hypocotyl, root and cotyledon explants from 30 day old seedlings of Sideritis angustifolia Lag. were cultured on Murashige and Skoog nutrient medium. Organogenesis of roots and shoots was induced with treatments containing BA or KIN in combination with NAA, IAA or 2,4-D, however, those combinations including NAA and BA were optimal. Most regenerated shoots developed roots when transferred to medium without growth regulators. Rooted plantlets were successfully transplanted into soil.

In vitro morphogenesis of grapevine (Vitis vinifera L.) inflorescence primordia, cvs Pinot Noir and Chardonnay

1998

Hormonal regulatory processes controlling in vitro morphogenesis of grapevine inflorescence primordia, excised from latent buds from November to April, were investigated. Cytokinin (benzylaminopurine, BAP), gibberellin (GA3) and auxin (3-indolebutyric acid, IBA) were used at 1 mg/L. BAP induced branch development and flower calyx differentiation. GA3 first promoted the elongation of inflorescence rachis and then promoted flower differentiation up to the formation of normal calyx and calyptra (the fused petals), while anthers and pistils were also present but not functional. IBA did not seem to be directly involved in these morphogenetic processes. After culturing for 6–7 weeks, explants bec…

Über den Ureidstoffwechsel beim Laubmoosprotonema von Funaria hydrometrica L. (Sibth.)1)1)Herrn Prof. Dr. Dr. Kurt Mothes zum 75. Geburtstag gewidmet.

1975

Summary The activity of allantoinase (EC 3.5.2.5) is influenced by light and darkness. The extracts of dark-grown moss protonema showed a very higher enzyme activity than the extracts of light-grown plants. The allantoinase activity was increased by light-dark and decreased by dark-light transitions. DMAP mimicked light effects by stabelizing the charakteristic light depending enzyme avctivities in the dark. The inhibitors DCMU, DNP and CCCP increased the enzyme activity of light-grown moss protonema, to some extend they induced a “physiological dark condition”.