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Effects of Day and Night Temperature on Vegetative Growth of Texas Panicum (Panicum texanum)

Published online by Cambridge University Press:  12 June 2017

David T. Patterson
David T. Patterson*
Affiliation:
Plant Physiol., U.S. Dep. Agric., Agric. Res. Serv., Dep. Bot., Duke Univ., Durham, NC 27706
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Abstract

Texas panicum was grown in controlled-environment chambers in 16 day/night temperature regimes ranging from 19/11 to 34/26 C. After 33 days, maximum plant height, leaf area, and dry weight occurred at 34/26 C. The greatest number of tillers and leaves occurred at 34/16 C. Partitioning of plant biomass into stems increased with increasing night temperature, while partitioning into leaves tended to decrease. Partitioning of biomass into roots decreased with increasing night temperature at day temperatures of 19 or 24 C but not at 34 C. Plant dry matter production (DMP) was highly correlated with both leaf area duration (LAD) and net assimilation rate (NAR) during the first 2 weeks of growth. During the subsequent 3 weeks, DMP was highly correlated with LAD but not with NAR. The low-temperature threshold for growth of Texas panicum was approximately 11 C. Texas panicum attained 25% of its maximum growth at an average daily temperature of 21 C, 50% at 24 C, and 75% at 26 C. Texas panicum is unlikely to become a highly competitive weed outside the southern and southwestern United States.

Keywords

Texas panicumPanicum texanum Buckl. # PANTEGrowth analysisecological rangebiomass partitioningPANTE
Type
Weed Biology and Ecology
Information
Weed Science , Volume 38 , Issue 4-5 , September 1990 , pp. 365 - 373
Copyright
Copyright © 1990 by the Weed Science Society of America 

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