Effects of environmental factors on germination of glyphosate-resistant and -susceptible biotypes of goosegrass Eleusine indica L. gaertin from Temerloh

Chuah T. S., . and Samijah S., . and Teng Y. T., . and Sayed M. Z., . and Ismail B. S., . (2003) Effects of environmental factors on germination of glyphosate-resistant and -susceptible biotypes of goosegrass Eleusine indica L. gaertin from Temerloh. [Proceedings Paper]

Effects of several environmental factors on germination of glyphosate-resistant R and -susceptible S biotypes of Eleusine indica were examined under laboratory conditions. Light was found to be not an essential factor for germination either at the R or the S biotypes. Both biotypes showed more than 85 germination either at constant temperatures of 25 and 30 deg C under darkness or at alternating temperatures of 30/20 and 35/20 deg C with a 12-h photoperiod. The R biotype however showed higher germination than the S biotype at 30 and 30 deg C under darkness as well as at 35/25 and 30/25 deg C with a 12-h photoperiod. The percentage germination for both biotypes decreased with increasing simulated moisture stress and no germination was observed at osmotic potential -0.80 MPa. However the R biotype exhibited higher germination 24 than the S biotype 7 at -0.60 MPa. Both biotypes were able to germinate under a wide range of pH exhibiting 79-100 germination at pH 3-11. Neither biotype entered innate dormancy 1 month after ripening. Three months after ripening the S biotype exhibited 12 induced dormancy whereas the R biotype did not show any dormancy. These results reflect the inherent short life cycle of the R seed in the soil. In a field infested with the R biotype schedule tillage may be practiced in order to promote the R over the S seedling emergence and consequently reduce the R seed carry-over into the seed bank.

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Abstract

Effects of several environmental factors on germination of glyphosate-resistant R and -susceptible S biotypes of Eleusine indica were examined under laboratory conditions. Light was found to be not an essential factor for germination either at the R or the S biotypes. Both biotypes showed more than 85 germination either at constant temperatures of 25 and 30 deg C under darkness or at alternating temperatures of 30/20 and 35/20 deg C with a 12-h photoperiod. The R biotype however showed higher germination than the S biotype at 30 and 30 deg C under darkness as well as at 35/25 and 30/25 deg C with a 12-h photoperiod. The percentage germination for both biotypes decreased with increasing simulated moisture stress and no germination was observed at osmotic potential -0.80 MPa. However the R biotype exhibited higher germination 24 than the S biotype 7 at -0.60 MPa. Both biotypes were able to germinate under a wide range of pH exhibiting 79-100 germination at pH 3-11. Neither biotype entered innate dormancy 1 month after ripening. Three months after ripening the S biotype exhibited 12 induced dormancy whereas the R biotype did not show any dormancy. These results reflect the inherent short life cycle of the R seed in the soil. In a field infested with the R biotype schedule tillage may be practiced in order to promote the R over the S seedling emergence and consequently reduce the R seed carry-over into the seed bank.

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Item Type:	Proceedings Paper
Additional Information:	Received on 3 Dec 2007 QK710.2 M239 2003
AGROVOC Term:	GERMINATION
AGROVOC Term:	GLYPHOSATE
AGROVOC Term:	ELEUSINE INDICA
AGROVOC Term:	MALAYSIA
Geographical Term:	MALAYSIA
Depositing User:	Ms. Norfaezah Khomsan
Last Modified:	24 Apr 2025 05:28
URI:	http://webagris.upm.edu.my/id/eprint/16962

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