Flavonoid dimers from the aerial parts of Conyza stricta

Al-Wahaibi, Lamya H.; Al-Saleem, Muneera S. M.; Basudan, Omar A.; Abdel‐Mageed, Wael M.

doi:10.1016/j.bse.2019.103959

Cited by 4 publications

(3 citation statements)

References 38 publications

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“…Several necessary enzymes for seed germination are activated by temperature [26]. Decreasing seed germination with increasing temperature can be linked to the winter annual nature of the species [21,22]. Slight differences among seed germination of the tested populations are due to the morphological/genetic variations.…”

Section: Constant and Alternating Day/night Temperaturementioning

confidence: 99%

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Seed germination ecology of Conyza stricta Willd. and implications for management

Ali

Khan

Ullah³

et al. 2020

PLoS ONE

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Numerous cropping systems of the world are experiencing the emergence of new weed species in response to conservation agriculture. Conyza stricta Willd. is being a newly emerging weed of barley-based cropping systems in response to conservational tillage practices. Seed germination ecology of four populations (irrigated, rainfed, abandoned and ruderal habitats) was studied in laboratory and greenhouse experiments. The presence/absence of seed dormancy was inferred first, which indicated seeds were non-dormant. Seed germination was then recorded under various photoperiods, constant and alternating day/night temperatures, and pH, salinity and osmotic potential levels. Seedling emergence was observed from various seed burial depths. Seeds of all populations proved photoblastic and required 12-hour light/dark period for germination. Seeds of all populations germinated under 5–30°C constant temperature; however, peak germination was recorded under 17.22–18.11°C. Nonetheless, the highest germination was noted under 20/15°C alternating day/night temperature. Ruderal and irrigated populations better tolerated salinity and germinated under 0–500 mM salinity. Similarly, rainfed population proved more tolerant to osmotic potential than other populations. Seeds of all populations required neutral pH for the highest germination, whereas decline was noted in germination under basic and alkaline pH. Seedling emergence was retarded for seeds buried >2 cm depth and no emergence was recorded from >4 cm depth. These results add valuable information towards our understanding of seed germination ecology of C. stricta. Seed germination ability of different populations under diverse environmental conditions suspects that the species can present severe challenges in future if not managed. Deep seed burial along with effective management of the emerging seedlings seems a pragmatic option to manage the species in cultivated fields. However, immediate management strategies are needed for rest of the habitats.

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Section: Constant and Alternating Day/night Temperaturementioning

confidence: 99%

“…Conyza stricta (erect horseweed), a member of the Conyza genus is recently being observed in several cropping systems of the world under conservation agricultural practices [19,20]. It is a winter annual growing ~1.1 m [21]. The species grows within an altitude range of 500-2000 m. The plant is used for several medicinal purposes [22].…”

Section: Introductionmentioning

confidence: 99%

Seed germination ecology of Conyza stricta Willd. and implications for management

Ali

Khan

Ullah³

et al. 2020

PLoS ONE

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“…Temperature is responsible for the activation of several necessary enzymes required to initiate seed germination [ 20 ]. Since the studied species is a winter annual, the decreased seed germination under high temperature can be explained with the nature of the species [ 8 , 48 ]. Differences among populations are linked with the maternal effects as semi-arid and arid populations have undergone harsh environmental conditions; thus, became able to germanite under a wide range of environmental conditions.…”

Section: Discussionmentioning

confidence: 99%

Seed germination ecology of Conyza sumatrensis populations stemming from different habitats and implications for management

Khalofah

et al. 2021

PLoS ONE

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Conyza sumatrensis (Retz.) E. H. Walker is an obnoxious weed, emerging as an invasive species globally. Seed germination biology of four populations of the species stemming from arid, semi-arid, temperate, and humid regions was determined in this study. Seed germination was recorded under six different environmental cues (i.e., light/dark periods, constant and alternating day and night temperatures, pH, salinity, and osmotic potential levels) in separate experiment for each cue. Populations were main factor, whereas levels of each environmental cue were considered as sub-factor. The impact of seed burial depths on seedling emergence was inferred in a greenhouse pot experiment. Seed germination was recorded daily and four germination indices, i.e., seed germination percentage, mean germination time, time to reach 50% germination, and mean daily germination were computed. Tested populations and levels of different environmental cues had significant impact on various seed germination indices. Overall, seeds stemming from arid and semi-arid regions had higher seed germination potential under stressful and benign environmental conditions compared to temperate and humid populations. Seed of all populations required a definite light period for germination and 12 hours alternating light and dark period resulted in the highest seed germination. Seed germination of all populations occurred under 5–30°C constant and all tested alternate day and night temperatures. However, the highest seed germination was recorded under 20°C. Seeds of arid and semi-arid populations exhibited higher germination under increased temperature, salinity and osmotic potential levels indicating that maternal environment strongly affected germination traits of the tested populations. The highest seed germination of the tested populations was noted under neutral pH, while higher and lower pH than neutral had negative impact on seed germination. Arid and semi-arid populations exhibited higher seed germination under increased pH compared to temperate and humid populations. Seed burial depth had a significant effect on the seedling emergence of all tested populations. An initial increase was noted in seedling emergence percentage with increasing soil depth. However, a steep decline was recorded after 2 cm seed burial depth. These results indicate that maternal environment strongly mediates germination traits of different populations. Lower emergence from >4 cm seed burial depth warrants that deep burial of seeds and subsequent zero or minimum soil disturbance could aid the management of the species in agricultural habitats. However, management strategies should be developed for other habitats to halt the spread of the species.

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Chemical constituents with ɑ,β-unsaturated carbonyl group from the whole plants of Erigeron breviscapus (Vant.) Hand.-Mazz. (Asteraceae)

Shi

Han

2020

Biochemical Systematics and Ecology

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Flavonoid dimers from the aerial parts of Conyza stricta

Cited by 4 publications

References 38 publications

Seed germination ecology of Conyza stricta Willd. and implications for management

Seed germination ecology of Conyza stricta Willd. and implications for management

Seed germination ecology of Conyza sumatrensis populations stemming from different habitats and implications for management

Chemical constituents with ɑ,β-unsaturated carbonyl group from the whole plants of Erigeron breviscapus (Vant.) Hand.-Mazz. (Asteraceae)

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