scholarly journals Cycloartane- and Lanostane-Type Triterpenoids from the Resin of Parthenium argentatum AZ-2, a Byproduct of Guayule Rubber Production

ACS Omega ◽  
2021 ◽  
Author(s):  
Ya-ming Xu ◽  
Chandrashekhar Madasu ◽  
Manping X. Liu ◽  
E. M. Kithsiri Wijeratne ◽  
David Dierig ◽  
...  
Keyword(s):  
Parthenium Argentatum ◽  
Rubber Production

scholarly journals (272) An Alternative Method for Estimating Heritability in Facultative Apomictic Guayule

HortScience ◽  
2006 ◽  
Vol 41 (4) ◽  
pp. 1028B-1028
Author(s):  
Maren E. Veatch-Blohm ◽  
Dennis T. Ray ◽  
Valerie H. Teetor
Keyword(s):  
Plant Breeding ◽  
Sexual Reproduction ◽  
Reproductive System ◽  
Significant Relationship ◽  
Broad Sense ◽  
Parthenium Argentatum ◽  
Rubber Production ◽  
Alternative Method ◽  
Highly Correlated ◽  
Range Of Values

Guayule (Parthenium argentatum Gray) has been difficult to improve through classical plant breeding because of its facultative apomictic reproductive system. Attempts have been made to increase rubber concentration and yield by examining traits correlated with rubber production and their heritabilities. We propose a new way of estimating heritability in guayule that more accurately accounts for the contributions of apomictic and sexual reproduction. At two years of growth, there was a significant relationship between the parents and the progeny for all traits measured, except for rubber and guayulin B concentrations. Due to the facultative apomictic nature of guayule reproduction, heritabilities are more accurately presented as a range of values between the narrow and broad sense heritabilities. Since guayule is more apomictic than sexual, most heritabilities will be closer to the broad sense values. To increase resin and rubber yield in the progeny, selection should focus on height and width in the parents because height and width are highly correlated with rubber yield, with the highest heritabilities (0.65 to 1.00 and 0.97 to 1.0, respectively) of the traits measured.

scholarly journals Downregulation of a CYP74 Rubber Particle Protein Increases Natural Rubber Production in Parthenium argentatum

2019 ◽  
Vol 10 ◽  
Author(s):  
Dante F. Placido ◽  
Niu Dong ◽  
Chen Dong ◽  
Von Mark V. Cruz ◽  
David A. Dierig ◽  
...  
Keyword(s):  
Natural Rubber ◽  
Rubber Particle ◽  
Parthenium Argentatum ◽  
Rubber Production

scholarly journals Photosynthesis and Rubber Production in Transgenic Guayule (Parthenium argentatum, Gray) in Response to Cold Night Temperatures

HortScience ◽  
2004 ◽  
Vol 39 (4) ◽  
pp. 770C-770 ◽  
Author(s):  
Maren E. Veatch* ◽  
Dennis T. Ray
Keyword(s):  
Photosynthetic Apparatus ◽  
Dry Weight ◽  
Parthenium Argentatum ◽  
Cold Night ◽  
Lower Growth ◽  
Cold Temperatures ◽  
Rubber Production ◽  
Warm Night ◽  
Nighttime Temperatures ◽  
Set Up

Rubber production in guayule (Parthenium argentatum, Gray) is highest in the winter months. It has been suggested that lower nighttime temperatures stimulate rubber production. Higher rubber production could be the result of up regulation of the enzymes involved in rubber synthesis, or acclimation of the photosynthetic apparatus to cold temperatures, making photosynthates available for rubber production when the plants are not actively growing, or a combination of the two factors. The effect of low night temperatures on photosynthesis and rubber production was examined in greenhouse grown plants. The experiment was set up as a split plot with different sub plots enclosed in heated or non-heated containers during the night. Those placed in non-heated containers were exposed to the ambient night temperatures of the greenhouse. During the growing season, growth was measured as change in height, and midday and diurnal photosynthetic measurements were collected. At harvest fresh and dry weight of both roots and shoots were taken. Resin and rubber were then extracted with acetone and cyclohexane respectively. Midday photosynthesis was as high or higher in cold night plants than in the warm night plants. In addition, the cold night treatment had lower growth than the warm night treatment. Percent resin and rubber were significantly higher in both shoots and roots of cold night plants, as was the overall yield of rubber. An increase in photosynthetic rate in the cold night treatment, without the concomitant increase in growth seen in the warm night treatment, could account for the increase in rubber production during the winter months.

Quantification of the Vulcanizing System of Rubber in Industrial Tire Rubber Production by Laser-Induced Breakdown Spectroscopy (LIBS)

2019 ◽  
Vol 91 (8) ◽  
pp. 5200-5206 ◽  
Author(s):  
Stefan Trautner ◽  
Johannes Lackner ◽  
Wolfgang Spendelhofer ◽  
Norbert Huber ◽  
Johannes D. Pedarnig
Keyword(s):  
Laser Induced Breakdown Spectroscopy ◽  
Tire Rubber ◽  
Rubber Production ◽  
Breakdown Spectroscopy ◽  
Laser Induced Breakdown

Absorption of citrate by the lutoids of latex and rubber production by Hevea

1977 ◽  
Vol 16 (4) ◽  
pp. 455-458 ◽  
Author(s):  
Michel Coupé ◽  
Claude Lambert
Keyword(s):  
Rubber Production

Essential leaf oils of Parthenium argentatum A. Gray

1979 ◽  
Vol 27 (3) ◽  
pp. 642-643 ◽  
Author(s):  
Rainer W. Scora ◽  
Junji Kumamoto
Keyword(s):  
Parthenium Argentatum
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