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Development of Range Grass Seedlings Germinated in Picloram

Published online by Cambridge University Press:  12 June 2017

C. J. Scifres  and
J. C. Halifax
C. J. Scifres
Affiliation:
Dep. of Range Sci., Texas A&M University, College Station, Texas 77843
J. C. Halifax
Affiliation:
Dep. of Range Sci., Texas A&M University, College Station, Texas 77843
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Abstract

Picloram (4-amino-3,5,6-trichloropicolinic acid) did not influence germination but differentially regulated postgermination growth of range grass seedlings. Radicle elongation of buffalograss (Buchloe dactyloides [Nutt] Elgelm.), sideoats grama (Bouteloua curtipendula [Michx.] Torr.)3, and switchgrass (Panicum virgatum L.) in petri dishes was reduced by 125 ppb picloram, whereas shoot elongation was not retarded by 1,000 ppb. Buffalograss, sideoats grama, and switchgrass seedlings, germinated in soil containing 500 ppb picloram, were usually not reduced in topgrowth production. However, topgrowth production of Arizona cottontop (Digitaria californica [Benth.] Henr.) and vine mesquite (Panicum obtusum H. B. K.) was reduced by 125 to 250 ppb of picloram in soil. Relative tolerance to picloram was ranked buffalograss, sideoats grama>switchgrass>vine mesquite, Arizona cottontop.

Type
Research Article
Information
Weed Science , Volume 20 , Issue 4 , July 1972 , pp. 341 - 344
Copyright
Copyright © Weed Science Society of America 

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References

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