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Effect of Shade on Texasweed (Caperonia palustris) Emergence, Growth, and Reproduction

Published online by Cambridge University Press:  20 January 2017

Rakesh K. Godara ,
Billy J. Williams  and
James P. Geaghan
Rakesh K. Godara*
Affiliation:
School of Plant Soil and Environmental Sciences, Louisiana State University and A&M College, Baton Rouge, LA 70803
Billy J. Williams
Affiliation:
Scott Research/Extension Center, 212-B Macon Ridge Road, Winnsboro, LA 71295
James P. Geaghan
Affiliation:
Department of Experimental Statistics, Louisiana State University and A&M College, Baton Rouge, LA 70803
*
Corresponding author's E-mail: rkgodara@gmail.com
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Abstract

Experiments were conducted on potted plants under field conditions in 2007 and 2008 at the Louisiana State University Agricultural Center's Northeast Research Station near St. Joseph, LA, to evaluate Texasweed response to shade. Shade levels of 30, 50, 70, and 90% were achieved using 1.8-m by 1.8-m by 1.8-m tents built using 2.54-cm-diam polyvinyl chloride (PVC) pipe and polypropylene fabric. Shade had no effect on Texasweed emergence but significantly reduced its growth. There were significant growth differences between plants transferred directly and gradually to a given shade level. At 100 d after emergence, plants gradually exposed to 30, 50, 70, and 90% shade had 13, 22, 37, and 58% less total dry matter per plants, respectively, than did those in 0% shade. Texasweed height in 70 and 90% shade was increased by 28 and 20%, respectively. Texasweed seemed to mitigate the adverse effect of shade by increasing specific leaf area (SLA) and percentage of leaf biomass. Increasing SLA and the percentage of leaf biomass appears to be a strategy for efficient allocation of biomass for light capture and carbohydrate synthesis, which can be used for height increase until the plant rises above the crop canopy. Although fruit production was significantly reduced, Texasweed was able to reproduce in 90% shade.

Keywords

Texasweed, Caperonia palustris (L.) St. Hil. CNPPAShadePAR reductionTexasweed
Type
Weed Biology and Ecology
Information
Weed Science , Volume 60 , Issue 4 , December 2012 , pp. 593 - 599
Copyright
Copyright © Weed Science Society of America 

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Footnotes

Current address: P.O. Box 438, Northeast Research Station, Saint Joseph, LA 71366.

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