ORIGINAL ARTICLE
Germination biology and phenological development stages of false jagged-chickweed (Lepyrodiclis holosteoides)
Mehdi Minbashi Moeini 1, A-F  
,   Eshagh Keshtkar 2, A-F
,   Hamidreza Sasanfar 3, A-F,   Mohammad Ali Baghestani 1, A-F
 
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1
Weed Research, Iranian Research Institute of Plant Protection, Agricultural Research, Education and Extension Organization (AREEO), Iran
2
Department of Agronomy, Faculty of Agriculture, Tarbiat Modares University, Iran
3
Weed reserach, Iranian Research Institute of Plant Protection, Agricultural Research, Education and Extension Organization (AREEO), Iran
A - Research concept and design; B - Collection and/or assembly of data; C - Data analysis and interpretation; D - Writing the article; E - Critical revision of the article; F - Final approval of article
CORRESPONDING AUTHOR
Mehdi Minbashi Moeini   

Weed Research, Iranian Research Institute of Plant Protection, Agricultural Research, Education and Extension Organization (AREEO), -, 1985813111, Teharan, Iran
Submission date: 2021-03-30
Acceptance date: 2021-06-14
Online publication date: 2021-09-08
 
 
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ABSTRACT
False jagged-chickweed (Lepyrodiclis holosteoides (C.A. Mey.) Fenzl ex Fisch. & C.A. Mey.) is an invasive weed species distributed in many regions of Iran. Scientific knowledge about the biology and ecology of false jagged-chickweed is rare. In a series of laboratory experiments, the effect of chilling treatments, potassium nitrate (KNO3), gibberellic acid (GA3), concentrations, temperature regimes, and sowing depths on seed germination and breaking seed dormancy of false jagged-chickweed was studied. In two field experiments the phenology of false jagged-chickweed and winter wheat (Triticum aestivum) was also compared. Chilling treatment for 15 days, a KNO3 concentration of 30 µmolar and a GA3 concentration of 144 µmolar increased germination percentage and germination rate. However, chilling treatment for 15 days did not increase germination rate as well as the KNO3 and GA3 treatments. A quadratic polynomial model predicted that the optimum temperature giving the maximum germination percentage was 22⁰C. Seedlings emerged in a range of sowing depths from 0 to 8 cm, while no seedling emergence occurred at sowing depths greater than 10 cm. Based on a Gaussian model, the optimum sowing depth was predicted to be 3.9 cm. False jagged-chickweed required higher GDD for seedling emergence than winter wheat, while the flowering stage of false jagged-chickweed occurred earlier than winter wheat. Results achieved in the present study are of interest not only for studying other life cycle aspects of this species but also as basic information for developing management strategies.
ACKNOWLEDGEMENTS
The authors wish to thank Professor Asghar Heydari (AREEO) for reviewing the paper.
FUNDING
The study was supported by the Iranian Research Institute of Plant Protection, Agricultural Research, Education and Extension Organization (AREEO) with grant No. 14-16-16-9252, Tehran, Iran.
RESPONSIBLE EDITOR
Kinga Matysiak
CONFLICT OF INTEREST
The authors have declared that no conflict of interests exist.
eISSN:1899-007X
ISSN:1427-4345