FRINK Linked Data Fragments server

Matches in SemOpenAlex for { <https://semopenalex.org/work/W137674469> ?p ?o ?g. }

• W137674469 abstract "This study attempted to define some of the factors or groups offactors which together determine the yield and composition ofpeppermint oil. By investigating the effect of these factors onplants under glasshouse-growth room conditions, an attempt was madeto understand the factors influencing oil yield and compositionunder field conditions. The manipulation of the field situation toincrease oil yield without adversely affecting oil composition wasinvestigated.The oil content of peppermint leaves increased from basal tomidstem leaves and decreased from midstem to apical leaves. Oilaccumulation corresponded to the period of leaf expansion, duringwhich glandular trichomes were observed to fill with oil. Midstemleaves accumulated maximum amounts of oil at the time inflorescenceswere observed on plants growing under long day-low night temperature(LD x LNT) conditions. Basal and apical leaves reached their maximumoil content prior to and following the appearance of inflorescences,respectively. Oil accumulation was favoured by LD x LNT conditionsrelative to SD x HNT (short day-high night temperature) conditions.The decreased oil accumulation under SD x HNT conditions did not appearto be associated with a deficiency of photosynthate, since oilmaturation occurred to the same extent under both LD x LNT and SD x HNTconditions. The results presented support previous reports of a true photoperiodiceffect on dry matter, oil yield, growth habit and flowering.Furthermore, it appeared that there exists a true photoperiodic effecton the monoterpene composition of peppermint oil. Day length, night temperature, day temperature and light intensity were also importantinteracting factors determining oil yield and composition, underglasshouse-growth room conditions. The photosynthate model proposedby Burbott and Loomis (1967) explained the effect of environmentalfactors with respect to pulegone, menthone and menthofuran. Factorsfavouring the maintenance of high levels of photosynthate resulted inhigh concentrations of menthone and low concentrations of pulegone andmenthofuran. The photosynthate model did not explain the effect ofenvironmental factors on several other monoterpenes of peppermint oil.An investigation of the net CO 2 exchange characteristics ofpeppermint indicated that light saturation occurred between 400 and500 pEM- 2s -1 in attached fully expanded leaves of peppermint. Maximumrates of 'apparent' photosynthesis occurred at 20°C. The importantdeterminants of 'apparent' photosynthesis were an increase in 'true'photosynthesis when temperature was increased to 25° C, a steadyincrease in dark respiration with increased temperature, and a rapidincrease in photorespiration between 15 ° C and 30°C. Such net CO 2exchange characteristics of peppermint support the photosynthate modelproposed to explain environmental effects on oil composition. With respect to the field situation in Tasmania, provided thatareas with reasonably high plant densities were considered, oil yieldper unit area reached a maximum early in the growing season. Oil yieldper unit area remained at the maximum level for a considerable period(5 to 6 weeks) with the only significant change being a final decreasein yield towards the end of the growing season. During the period ofmaximum otl yield the percentage menthol increased from approximately40% to 45%. Delaying harvest once the percentage menthol reached therequired 45%, resulted in further increases in the percentage menthol,but at the expense of increased percentage menthofuran and decreasedoil yields. In addition to the above study of harvest date, the relationshipbetween nitrogen application and irrigation rate and timing, on theyield and composition of peppermint oil and the possibility of obtainingtwo harvests of peppermint in one season, were investigated. Highyields of oil were associated with high applications of nitrogen andhigh levels of irrigation, particularly throughout the last half ofthe growing season. The composition of oil extracted from herb at thecommercial harvest date (approximately 45% menthol) was not significantlyaffected by either nitrogen or irrigation treatments. The oil yieldfrom regrowth within the same growing season was significantly affectedby irrigation and nitrogen treatments applied prior to the firstharvest. When 300kg N/ha and 50mm of irrigation weekly (during thelast half of the growing season) were applied, the oil yields fromregrowth approached the yield normally obtained at the commercialharvest date. Oil from regrowth contained high concentrations ofmenthol, menthyl acetate, menthofuran and limonene, and lowconcentrations of menthone and cineole, relative to peppermint oiltypical of Tasmanian production areas. In a subsequent trial involving the manipulation of harvest date,nitrogen and irrigation, the first harvest was timed to coincide withmaximum oil yield per unit area (40% menthol) and the second harvestoccurred when the concentration of menthol exceeded 50%. In this waythe total yield of oil per unit area was increased significantlywithout adversely affecting oil quality. By comparing the compositionand yield potential of peppermint oil under Tasmanian conditions withthat reported for other world production areas, it is concluded thatTasmania is well suited to the production of high yields of highquality peppermint oil." @default.
• W137674469 created "2016-06-24" @default.
• W137674469 creator A5082997119 @default.
• W137674469 date "1981-01-01" @default.
• W137674469 modified "2023-09-26" @default.
• W137674469 title "A study of some factors affecting the yield and composition of peppermint oil (mentha piperita L.)" @default.
• W137674469 hasPublicationYear "1981" @default.
• W137674469 type Work @default.
• W137674469 sameAs 137674469 @default.
• W137674469 citedByCount "0" @default.
• W137674469 crossrefType "dissertation" @default.
• W137674469 hasAuthorship W137674469A5082997119 @default.
• W137674469 hasConcept C134121241 @default.
• W137674469 hasConcept C138885662 @default.
• W137674469 hasConcept C140793950 @default.
• W137674469 hasConcept C144027150 @default.
• W137674469 hasConcept C15744967 @default.
• W137674469 hasConcept C178165689 @default.
• W137674469 hasConcept C185592680 @default.
• W137674469 hasConcept C191897082 @default.
• W137674469 hasConcept C192562407 @default.
• W137674469 hasConcept C2777278459 @default.
• W137674469 hasConcept C2780138947 @default.
• W137674469 hasConcept C40231798 @default.
• W137674469 hasConcept C41895202 @default.
• W137674469 hasConcept C44670240 @default.
• W137674469 hasConcept C542102704 @default.
• W137674469 hasConcept C59822182 @default.
• W137674469 hasConcept C86803240 @default.
• W137674469 hasConceptScore W137674469C134121241 @default.
• W137674469 hasConceptScore W137674469C138885662 @default.
• W137674469 hasConceptScore W137674469C140793950 @default.
• W137674469 hasConceptScore W137674469C144027150 @default.
• W137674469 hasConceptScore W137674469C15744967 @default.
• W137674469 hasConceptScore W137674469C178165689 @default.
• W137674469 hasConceptScore W137674469C185592680 @default.
• W137674469 hasConceptScore W137674469C191897082 @default.
• W137674469 hasConceptScore W137674469C192562407 @default.
• W137674469 hasConceptScore W137674469C2777278459 @default.
• W137674469 hasConceptScore W137674469C2780138947 @default.
• W137674469 hasConceptScore W137674469C40231798 @default.
• W137674469 hasConceptScore W137674469C41895202 @default.
• W137674469 hasConceptScore W137674469C44670240 @default.
• W137674469 hasConceptScore W137674469C542102704 @default.
• W137674469 hasConceptScore W137674469C59822182 @default.
• W137674469 hasConceptScore W137674469C86803240 @default.
• W137674469 hasLocation W1376744691 @default.
• W137674469 hasOpenAccess W137674469 @default.
• W137674469 hasPrimaryLocation W1376744691 @default.
• W137674469 hasRelatedWork W1964579310 @default.
• W137674469 hasRelatedWork W1979617373 @default.
• W137674469 hasRelatedWork W2002371485 @default.
• W137674469 hasRelatedWork W2009933235 @default.
• W137674469 hasRelatedWork W2058425327 @default.
• W137674469 hasRelatedWork W2061612053 @default.
• W137674469 hasRelatedWork W2062816650 @default.
• W137674469 hasRelatedWork W2064202215 @default.
• W137674469 hasRelatedWork W2110427731 @default.
• W137674469 hasRelatedWork W2142732274 @default.
• W137674469 hasRelatedWork W2148042120 @default.
• W137674469 hasRelatedWork W2328412290 @default.
• W137674469 hasRelatedWork W2329118913 @default.
• W137674469 hasRelatedWork W2331776345 @default.
• W137674469 hasRelatedWork W2332316588 @default.
• W137674469 hasRelatedWork W2377839706 @default.
• W137674469 hasRelatedWork W2589246627 @default.
• W137674469 hasRelatedWork W292351683 @default.
• W137674469 hasRelatedWork W2946497940 @default.
• W137674469 hasRelatedWork W38980070 @default.
• W137674469 isParatext "false" @default.
• W137674469 isRetracted "false" @default.
• W137674469 magId "137674469" @default.
• W137674469 workType "dissertation" @default.