Effects of glyphosate on the mortality and shikimic acid level in two goosegrass (Eleusine indica (L.) Gaertn.) biotypes (Kesan glifosat terhadap kematian dan kandungan asid shikimik di dalam dua biotip rumput sambau (Eleusine indica (L.) Gaertn.))

Content Provider	Semantic Scholar
Author	Ismail, B. Sahid Salmijah, S.
Copyright Year	2004
Abstract	The status of glyphosate resistance in Eleusine indica [L.] Gaertn. biotypes collected from two different areas namely, Lenggeng and Bidor as compared to a known susceptible biotype from CCM Bioscience Agrochemicals Research Centre (BRC), Malaysia was determined. Involvement of 5- enolpyruvylshikimate3-phosphate synthase (EPSPS) in the glyphosate-resistant biotype was investigated through the measurement of the shikimic acid content. Using glyphosate at doses ranging from 0.27‐16.00 kg a.i./ha, the Bidor biotype was 7-fold more resistant than the BRC and Lenggeng biotypes. The resistance status of the Bidor biotype was confirmed by a much lower shikimic acid accumulation compared to the BRC and Lenggeng biotypes. There was no significant difference ( p >0.05) between shikimic acid accumulation in the leaves and stems at lower doses of glyphosate. At higher doses of glyphosate (1.44 ‐16.00 kg a.i./ha for BRC and Lenggeng biotypes; 7.20 ‐16.00 kg a.i./ha for Bidor biotype), shikimic acid accumulation was detected to be higher in the leaves than in the stems (*p <0.05). While EPSPS in the leaves and stems were both inhibited at lower doses, self-limitation probably impaired glyphosate translocation from the leaves to the stems at higher doses. Therefore, leaves were the likely major inhibition sites at high glyphosate concentrations.
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Alternate Webpage(s)	http://ejtafs.mardi.gov.my/jtafs/32-2/Evaluation%20of%20chrysanthemum%20residue.pdf
Language	English
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Content Type	Text
Resource Type	Article