Rising CO2 can alter fodder–weed interactions and suppression of Parthenium hysterophorus. (12th November 2014)

• Record Type: Journal Article
• Authors: Khan, N; George, D; Shabbir, A; Hanif, Z; Adkins, S W; Swanton, Clarence
• Is Part Of: Weed research. Volume 55:Number 2(2015:Apr.)
• Page Start: 113
• Page End: 117
• Publication Date: 2014-11-12
• Subjects: Weeds -- Control -- Periodicals; Herbicides -- Periodicals; 632.5
• DOI: 10.1111/wre.12127
• Languages: English
• ISSNs: 0043-1737

Abstract

<abstract abstract-type="main" id="wre12127-abs-0001"> <title>Summary</title> <p>Three C<sub>4</sub> grass (<italic>Setaria incrassata</italic>, <italic> Astrebla squarrosa</italic> and <italic>Bothriochloa decipiens</italic>) and one C<sub>3</sub> legume (<italic>Clitoria ternatea</italic>) suppressive fodder species, were re‐evaluated against the growth of the C<sub>3</sub><italic>Parthenium hysterophorus</italic> under an ambient (390 μmol mol<sup>−1</sup>) and an elevated atmospheric CO<sub>2</sub> concentration (550 μmol mol<sup>−1</sup>). Under the elevated atmospheric CO<sub>2</sub>, shoot dry biomass and suppression index (SI) value of the C<sub>4</sub><italic>S. incrassata</italic> were both reduced by 32% and 0.7 respectively, while those for <italic>A. squarrosa</italic> were reduced by 23% and 0.3. In contrast and under the same elevated atmospheric CO<sub>2</sub> concentration, the shoot dry biomass and SI of the C<sub>4</sub><italic>B</italic>. <italic>decipiens</italic> were increased by 8% and 0.1 respectively, while those for the C<sub>3</sub><italic>C. ternatea</italic> were increased by 38% and 0.8. Our results suggest that C<sub>3</sub> fodder plants along with certain C<sub>4</sub> species could be utilised for the effective management of <italic>P</italic>. <italic>hysterophorus</italic> under the future elevated atmospheric CO<sub>2</sub> conditions. However, this system needs more fodder species to be investigated. Our results suggest that rising CO<sub>2</sub><italic>per se</italic> may alter the efficacy of suppressive fodder management of an invasive C<sub>3</sub> species, <italic>P</italic>. <italic>hysterophorus</italic>.</p> </abstract>