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Published online 1 March 1982
Published in Agron J 74:303-307 (1982)
© 1982 American Society of Agronomy
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Salt and Water Stress Effects on Germination of Guayule Seeds1

S. Miyamoto, K. Sosnovske and J. Tipton2

In view of developing domestic rubber productions, guayule (Parthenium argentatum G.) is receiving renewed interest; however, necessary cultural practices have not been well established, especially under saline conditions. Studies were performed, therefore, to evaluate salt and soil water stress effects on seed germination. The test materials included four USDA selections (11646, 11604, 11633, and A48118) and one cultivar (593). Petri dish solution cultures were used for evaluating salt effects, and two sandy soils (Typic Torrifluvents and Typic Torripsamments) placed in petri dishes were used for studying soil water stress effects. Results indicate that seed germination may be reduced by approximately 25%, due to salinity of salt solutions ranging from 7 to 19 mmho/cm with a descending order of tolerance of 11646, 593,11604 = 11633, and A48118. Selection 11646 showed excellent characteristics as well as high salt tolerance. Specific ion effects were insignificant when tested in salt solutions havingmixed ion compositions. Soil water stress needs to be controlled at less than about 0.8 bar if germination is to be accomplished without adverse effects of water stress.

Key Words: Parthenium argentatum G. • Natural rubber • Latex • Salinity • Water quality

1 Contribution from Texas Agric. Exp. Stn. Journal No. 16845. This program was supported in part by a grant from USDA.

2 Assistant prof., technician and assist, prof., respectively. Texas A&M Univ. Research Center, El Paso, 1380 A&M Circle, El Paso, TX 79927.

Received for publication April 7, 1981.




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