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Germination and Emergence of Hairy Beggarticks (Bidens pilosa)

Published online by Cambridge University Press:  12 June 2017

Krishna N. Reddy  and
Megh Singh
Krishna N. Reddy
Affiliation:
Citrus Res. and Educ. Ctr., Univ. Florida, IFAS, 700 Exp. Stn. Road, Lake Alfred, FL 33850
Megh Singh
Affiliation:
Citrus Res. and Educ. Ctr., Univ. Florida, IFAS, 700 Exp. Stn. Road, Lake Alfred, FL 33850
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Abstract

Effects of environmental factors on germination and emergence of hairy beggarticks were examined in laboratory and greenhouse studies. Optimum temperature range for germination of hairy beggarticks was 25/20 to 35/30 C (day/night, 12/12 h). Germination decreased above or below this range. Temperatures below 15/10 C and above 45/40 C were unfavorable for germination. Hairy beggarticks seed can germinate under both a 12-h photoperiod and a 24-h dark regime. Seed germinated 78 to 90% in buffer solutions of pH 4 to 9. Radicle growth was more sensitive to extreme pH than germination. Osmotic stress up to −0.1 MPa had little effect on germination, but less than 3% of the seed germinated at an osmotic stress of −0.75 MPa. Hairy beggarticks seed (13%) germinated at NaCl concentration of 100 mM but failed to germinate at 200 mM NaCl. Maximum emergence occurred when seed were planted less than 1 cm deep. No seedlings emerged when planted 10 cm deep. Flooding even for a day following planting decreased emergence to 25% compared to no flooding (56%). Seedling emergence decreased sharply with a further increase in duration of flooding, and no seedlings emerged when flooding was maintained up to 28 d after planting.

Keywords

Hairy beggarticksBidens pilosa L. #3 BIDPIFloodlightosmotic potentialpHplanting depthsalt stresstemperatureweed biologyBIDPI
Type
Weed Biology and Ecology
Information
Weed Science , Volume 40 , Issue 2 , June 1992 , pp. 195 - 199
Copyright
Copyright © 1992 by the Weed Science Society of America 

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