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Seed Germination Ecology of Purple-Leaf Button Weed (Borreria ocymoides) and Indian Heliotrope (Heliotropium indicum): Two Common Weeds of Rain-Fed 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: [email protected]
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Abstract

Purple-leaf button weed and Indian heliotrope are widespread and common weed species of rain-fed rice in many tropical countries. The influence of various environmental factors on seed germination of these species was studied. Seeds of both species germinated at a range of alternating temperatures (25/15, 30/20, and 35/25 C day/night). Germination of purple-leaf button weed was similar among light conditions after an after-ripening period of 3 mo, whereas germination of Indian heliotrope was always greater in light. Seed germination of both species was not affected by a high level of salt and a range of pH between 5 and 9, but was sensitive to high degrees of water stress. Seed burial strongly inhibited germination and emergence of these species. Seedling emergence of purple-leaf button weed (82 to 86%) and Indian heliotrope (70%) was optimal when seeds were sown in the top 0.2-cm soil layer. A burial depth of 2 cm completely inhibited emergence of Indian heliotrope, whereas, for purple-leaf button weed, this depth was 5 cm. Most of these seeds germinated, however, when brought to the soil surface. The information gained from this study would help in predicting the potential of these species for spreading into new areas, and could contribute to their control.

Keywords

Purple-leaf button weed, Borreria ocymoides (Burm. f.) Dc.Indian heliotrope, Heliotropium indicum L. HEINrice, Oryza sativa L.Burial depthemergencegerminationlightseedstemperatureweeds
Type
Weed Biology and Ecology
Information
Weed Science , Volume 56 , Issue 5 , October 2008 , pp. 670 - 675
Copyright
Copyright © Weed Science Society of America 

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