Dormancy studies on Euphorbia dracunculoides and Astragalus spp.: major weeds of arid areas

Ikram, R.M.; Tanveer, Asif; Ata, Zahid; Saqib, Muhammad

doi:10.1590/s0100-83582014000400009

Cited by 5 publications

(1 citation statement)

References 12 publications

(5 reference statements)

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“…Genus Astragalus is found in North and South America, Asia, Europe, northern Africa, and Australia (Naghiloo et al, 2012). Both species are the most troublesome weeds of rainfed chickpea (Ikram et al, 2014). The salient features of this area include moisture shortage as a result of inadequate and erratic rains, low-temperature stress (frost) during December-January, marginal land, no use of fertilizers, and presence of weeds (Sijapati and Bhatt, 2012).…”

Section: Introductionmentioning

confidence: 99%

Germination Ecology of Two Troublesome Weeds of Arid Chickpea: Euphorbia dracunculoides and Astragalus Species

et al. 2019

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The species Euphorbia dracunculoides and Astragalus are problematic weeds of arid chickpea in the chickpea mono-cropping system in Pakistan. The influence of various ecological factors on germination and seedling emergence characteristics of these weeds was determined under laboratory conditions. The results suggested that seed germination of both species was 50% at 15 oC under light conditions, and germination decreased when the temperature was increased. The increase in drought stress from 2.5 to 15% significantly decreased germination of E. dracunculoides and Astragalus spp. Both species failed to germinate at the osmotic potential of -3.02 MPa. The increase in field capacity from 25 to 100% increased emergence percentage and emergence index of both weeds. A pH range of 6 to 9 did not influence seed germination of both species and they were able to germinate at a wide range of pH conditions. Both weeds were very sensitive to salinity; however, a few seeds (10%) of Astragalusspp. germinated even at a 150 mM sodium chloride concentration. To check the effect of burial depth, seeds were placed in pots under seeding depths of 0 to 6 cm at an interval of 1 cm, respectively. Maximum emergence was attained at the soil surface and emergence declined with increasing depths. Seedling emergence of E. dracunculoides was higher than that of Astragalusspp. at all burial depths. Studies on germination ecology of these two weeds will offer insights into their behavior under different environmental conditions. Their germination responses and growth patterns under different ecological factors will help us to design an efficient management strategy to control these two troublesome weeds.

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Section: Introductionmentioning

confidence: 99%

Germination Ecology of Two Troublesome Weeds of Arid Chickpea: Euphorbia dracunculoides and Astragalus Species

et al. 2019

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Seed Dormancy Mechanisms in Basalt Milkvetch and Western Prairie Clover

Jones

Johnson

Bushman

et al. 2016

Rangeland Ecology & Management

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A meta-analysis of the effects of treatments used to break dormancy in seeds of the megagenus Astragalus (Fabaceae)

Soltani

Baskin

et al. 2020

Seed Sci. Res.

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Astragalus is the largest genus of seed plants with 3000 or more species that occurs naturally on several continents. The genus has some use as a forage and medicine and in industry, and many of the species are rare endemics threatened with extinction. The seeds are reported to be dormant at maturity, and various treatments have been used in an attempt to germinate them. Our primary aim was to determine via a meta-analysis the most effective way(s) to break dormancy in seeds of this species-rich genus. Mechanical and chemical (conc. sulphuric acid) scarification were by far the best of 12 treatments for breaking seed dormancy of the 40 species included in our meta-analysis, whereas prechilling, gibberellin and smoke were ineffective. These results along with those of imbibition tests confirm that seeds of the examined Astragalus species have physical dormancy (PY). Further, PY in these 40 species and (its documented occurrence) in 118 species that could not be included in our meta-analysis transcends climatic and geographic boundaries, edaphic conditions, life cycle/life form types and infrageneric phylogeny. Thus, it seems likely that most species of Astragalus have PY. However, in addition to PY, physiological dormancy (PD), that is, combinational dormancy (PY + PD), has been reported in a few species of Astragalus. This study should be useful to both basic and applied scientists who want to germinate seeds of Astragalus.

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Dormancy studies on Euphorbia dracunculoides and Astragalus spp.: major weeds of arid areas

Cited by 5 publications

References 12 publications

Germination Ecology of Two Troublesome Weeds of Arid Chickpea: Euphorbia dracunculoides and Astragalus Species

Germination Ecology of Two Troublesome Weeds of Arid Chickpea: Euphorbia dracunculoides and Astragalus Species

Seed Dormancy Mechanisms in Basalt Milkvetch and Western Prairie Clover

A meta-analysis of the effects of treatments used to break dormancy in seeds of the megagenus Astragalus (Fabaceae)

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