نتایج جستجو برای: وایول parthenium argentatum gray

تعداد نتایج: 41278  

در این تحقیق تأثیر تیمارهای مختلف آبیاری بر ترکیب شیمیایی و خواص ضد باکتریایی اسانس گل گیاه وایول (Parthenium argentatum A. Gray) مطالعه شده است. اجرای مطالعات تیمار آبیاری گیاهان در قالب طرح آماری اسپلیت پلات در چهار سطح آبیاری کامل (در حد ظرفیت زراعی)، تنشهای ملایم (75% و 50% ظرفیت زراعی) و شدید (25% ظرفیت زراعی) و در سه تکرار انجام شد. بعد اسانس گیاهان تحت تیمار استخراج شده و مورد بررسی کمی ...

Journal: :Industrial Crops and Products 2021

The commercial development of guayulins might help spur industrial-scale applications guayule as an alternative source natural rubber, making necessary to build knowledge on their seasonal response and accumulation in plants. In the present study, content four known (A–D) was profiled 14 different accessions, including hybrids, from age 13 months 23 months. Analysis revealed that accessions cou...

2013
H. Mohan Behl Bernard Marchand Eloy Rodriguez

High perform ance liquid chrom atography was used to quantify the sesquiterpene phenolic esters, G uayulin A and -B in Parthenium argentatum (guayule) and Fj hybrids o f guayule with Parthenium schottii, P. fruticosum var. trilobatum and P. tomentosum var. stramonium. The d istri­ bution o f these phenolic acid esters in all parts o f the plants are reported and their inheritance in hybrids is ...

2005
Katrina Cornish Deborah J. Scott

Natural rubber is an irreplaceable raw material vital to industry, transportation, medicine and defense. It is largely produced from clonal plantations of Hevea brasiliensis in southeastern Asia. Temperate-zone rubber-producing crops are greatly desired to increase biodiversity, protect supplies, and provide a safe natural-rubber alternative for the large numbers of people suffering from Type I...

Journal: :Phytochemistry 2006
Bernardo M T da Costa Jay D Keasling Colleen M McMahan Katrina Cornish

Natural rubber is produced by a rubber transferase (a cis-prenyltransferase). Rubber transferase uses allylic pyrophosphate to initiate the rubber molecule and isopentenyl pyrophosphate (IPP) to form the polymer. Rubber biosynthesis also requires a divalent metal cation. Understanding how molecular weight is regulated is important because high molecular weight is required for high quality rubbe...

Journal: :Zeitschrift fur Naturforschung. C, Journal of biosciences 2002
Galal T Maatooq Joseph J Hoffmann

Two pyridine alkaloids were isolated from the derubberized resin of the hybrid Parthenium argentatum x P tomentosa. These alkaloids are (+/-)-N-[4-(1-aminoethyl) phenyl]-4-[3-methylbutenylidine]-1,4-dihydropyridine (guayulamine A) and (+/-)-N-[4-(1-aminoethyl) phenyl]-4-[4-methylpentenylidine]-1, 4-dihydropyridine (guayulamine B). The structures were established by one- and two-dimensional NMR ...

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