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Seed Germination Ecology of Catchweed Bedstraw (Galium aparine)

Published online by Cambridge University Press:  20 January 2017

Hongchun Wang ,
Bing Zhang ,
Liyao Dong  and
Yuanlai Lou
Hongchun Wang
Affiliation:
Institute of Plant Protection, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China
Bing Zhang
Affiliation:
Nanjing Agricultural Pesticide Science & Technology Development Limited Company, Nanjing 210095, China
Liyao Dong
Affiliation:
College of Plant Protection, Nanjing Agricultural University, Nanjing 210095, China
Yuanlai Lou*
Affiliation:
Institute of Plant Protection, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China
*
Corresponding author's E-mail: louyl@jaas.ac.cn
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Abstract

The influence of temperature, light, solution pH, water stress, salt stress, and burial depth on seed germination and seedling emergence of catchweed bedstraw and the sensitivity of that weed to commonly available herbicides in China were studied in laboratory and greenhouse. Germination occurred at day/night temperatures from 5/0 C to 30/25 C, with optimum germination at 15/10 C. Catchweed bedstraw germinated equally well under a 12-h photoperiod and continuous darkness; however, a 24-h photoperiod inhibited seed germination. Catchweed bedstraw seed is moderately sensitive to osmotic potential and salt stress, with 15 and 3% germination rates at an osmotic potential of −0.5 Mpa and salinity level of 120 mM, respectively. Maximum seed germination was observed in near neutral pH; germination was greater than 80% over a broad pH range from 5 to 8. Seedling emergence of the seeds buried at a depth of 1 cm was higher (74%) than those placed on the soil surface (20%), but declined with burial depth increasing. Few (10%) seedlings emerged when seeds were placed at a depth of 5 cm. Bensulfuron-methyl, and ethametsulfuron-methyl applied PRE and tribenuron-methyl, fluroxypyr, and florasulam applied POST can be used to provide greater than 80% control of catchweed bedstraw. The results of this study have contributed to more complete understanding of the germination and emergence of catchweed bedstraw.

Keywords

Catchweed bedstrawGalium aparine L.Burial depthherbicidelightosmotic potentialpHsalt stresstemperature
Type
Weed Biology and Ecology
Information
Weed Science , Volume 64 , Issue 4 , December 2016 , pp. 634 - 641
Copyright
Copyright © 2016 by the Weed Science Society of America 

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Footnotes

Associate editor for this paper: Timothy Grey, University of Georgia.

References

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