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Phenotypic Plasticity of Chinese Sprangletop (Leptochloa chinensis) in Competition with Seeded Rice

Published online by Cambridge University Press:  20 January 2017

Bhagirath S. Chauhan  and
David E. Johnson
Bhagirath S. Chauhan*
Affiliation:
Crop and Environmental Sciences Division, International Rice Research Institute, Los Baños, Philippines
David E. Johnson
Affiliation:
Crop and Environmental Sciences Division, International Rice Research Institute, Los Baños, Philippines
*
Corresponding author's E-mail: b.chauhan@cgiar.org
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Abstract

Chinese sprangletop, a C4 species, is one of the most important grass weeds of seeded rice in Asia. Chinese sprangletop biology was studied by growing it alone and in competition with 4 and 12 rice plants. Rice competition did not affect the height of Chinese sprangletop, and the weed grew taller than rice, regardless of the competition. Compared with Chinese sprangletop grown alone, competition from rice reduced Chinese sprangletop leaf number, leaf production rate, tiller number, tiller production rate, leaf area, shoot biomass, relative growth rate, and net assimilation rate. Leaf area and shoot biomass of Chinese sprangletop when grown in competition with 12 rice plants was only 16% and 13%, respectively, of the leaf area and biomass of the weed grown alone.

Leptochloa chinensis, una especie C4, es una de las malezas más importantes en el cultivo del arroz de siembra directa en Asia. Se estudió la biología de esta maleza creciéndola sola y en competencia con 4 y 12 plantas de arroz. La competencia con el arroz no afectó la altura de L. chinensis y la maleza desarrolló mayor altura que el arroz, sin importar la competencia. Comparada con L. chinensis sembrada sola, la competencia del arroz redujo el número de hojas de la maleza, la tasa de producción de hojas, el número y tasa de producción de vástagos, el área foliar, la biomasa del tejido aéreo y las tasas de crecimiento relativo y de asimilación neta. El área foliar y la biomasa del tejido aéreo de L. chinensis cuando se cultivó en competencia con 12 plantas de arroz, fue solamente 16 y 13%, respectivamente, de los valores observados cuando la maleza se sembró sola.

Keywords

Chinese sprangletop, Leptochloa chinensis (L.) Nees LEFCHrice, Oryza sativa L.Plasticityweedcompetitionleaf areabiomass
Type
Weed Biology and Competition
Information
Weed Technology , Volume 25 , Issue 4 , December 2011 , pp. 652 - 658
Copyright
Copyright © Weed Science Society of America 

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