Influence of cohorts on<i>Chenopodium album</i>demography

Mulugeta, Dawit; Stoltenberg, David E.

doi:10.1017/s0043174500090184

Cited by 30 publications

(26 citation statements)

References 27 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In our study, however, low PPFD reduced seed production by almost 50% (Table 7), consistent with studies of C. album in competition with Zea mays (L.) (Colquhoun et al. , 2001) and other weeds (Mulugeta & Stoltenberg, 1998). In contrast, under comparable light treatments, low R/FR has been shown to reduce seed production (Causin & Wulff, 2003).…”

Section: Resultssupporting

confidence: 92%

ExploringChenopodium albumadaptive traits in response to light and temperature stresses

Mahoney

Swanton

2008

Weed Research

View full text Add to dashboard Cite

Summary Weeds within canopies are depleted in photosynthetic photon flux density (PPFD) and red to far‐red light ratio (R/FR) throughout their lifespan. Growth cabinet studies isolated PPFD and R/FR effects and explored the adaptive traits of a model invasive weed, Chenopodium album, to light and temperature. Reproductive development progressed rapidly at high temperature, yet the rate of leaf appearance was insensitive to temperatures of 25:15 and 10:5°C (day:night). Low R/FR effects were detected early in the life cycle, but by seed set, growth was influenced by low PPFD. C. album adapted to the simulated canopy environments by delaying seed set, growing taller and producing more leaf area per mol of accumulated incident PPFD. Low PPFD reduced seed number per plant and the carbon/nitrogen ratio of those seeds, but not seed weight. PPFD was a primary cue for many shade avoidance traits and only under low PPFD did R/FR modify the expression of these traits. This study elucidates the adaptive strategies that make C. album a persistent weed.

show abstract

Section: Resultssupporting

confidence: 92%

ExploringChenopodium albumadaptive traits in response to light and temperature stresses

Mahoney

Swanton

2008

Weed Research

View full text Add to dashboard Cite

show abstract

“…However, random variation in the length of the season selects for a prolonged period in life, in which vegetative and reproductive growth overlap. This may lead to further production of generative structures in the case of an unexpectedly long season (King and Roughgarten 1982), as was reported for annuals from semi-deserts (Van Rooyen et al 1992;Hegazy 2001), ephemerally emergent muddy bottoms (von Lampe 1996; Van der Sman et al 1992), and arable land Masalles 1994, 1997;Mulugeta and Stoltenberg 1998). However, a disturbance does not have to terminate the development of a population of short-lived species, as they are able to resprout to a certain degree (Klimešová and Klimeš 2003).…”

Section: Introductionmentioning

confidence: 70%

Life-history variation in the short-lived herb Rorippa palustris: effect of germination date and injury timing

2006

View full text Add to dashboard Cite

Life-history variation in annuals is known to be caused by size requirements for photoinduction of flowering, but the importance of germination date and injury was overlooked so far even though they may play an important role in disturbed habitats. To test the effect of germination date and timing of injury on life-history variation of an annual plant, we performed a 2-year pot experiment with the root-sprouting herb Rorippa palustris. Plants belonging to six different cohorts, and sown at monthly intervals from April to September, were injured (all stem parts removed) in three ontogenetic stages: vegetative rosettes, flowering plants and fruiting plants. Plants from the April, and partly from the May, cohort behaved as summer annuals: they started to bolt at the same time, resprouted and overwintered poorly. Plants from the June cohort flowered in the first season as well, but they entered the bolting stage a month later than the preceding cohorts, produced the least fruits, but overwintered successfully and flowered again the second year (polycarpic perennials).Cohorts germinating after the summer solstice did not flower during the first year and, with the exception of the September cohort, overwintered successfully and flowered the second year (winter annuals). After injury, the pattern of life-histories was the same as in control plants, although generative reproduction was interrupted by injury in the first year of the experiment. About one quarter of plants injured in the vegetative stage regenerated after injury irrespective of cohort, however, regeneration was enhanced in larger plants. Regeneration of plants in the flowering and fruiting stages depended on date of injury in relation to day length, being the most successful after the summer solstice. Life-history variation, together with the ability to resprout after severe injury in the pioneer wetland herb Rorippa palustris is caused by its ability to germinate throughout the season. Even the second tested factor, the effect of injury, is modified by germination time. The experiment points to a complex nature of factors affecting lifehistory variation as well as resprouting after severe injury in short lived plants.

show abstract

“…Colquhoun and colleagues (2001), recorded between 75 600 seed and 150 400 seeds produced plant −1 for C. album at a density of four plants m −2 , compared with a range of 68 212 (in 2000) to as much as 371 199 (2001) plant −1 for the same density in the present study. Both Colquhoun and colleagues (2001) and Mulugeta and Stoltenberg (1998) note that there was considerable variability in seed production in this species between years because of climatic conditions. This illustrates the need to develop robust but dynamic relationships that can respond to climate variability between years and the importance of developing relationships from data collected from multiple seasons.…”

Section: Discussionmentioning

confidence: 99%

Seed production of Chenopodium album in competition with field vegetables

et al. 2004

View full text Add to dashboard Cite

Total weed control within a crop is both difficult and expensive to achieve, so that some weeds will often remain to set seed. The seed production resulting from these weeds will ultimately affect the sustainability of the weed control strategy. If too much is allowed to return each season there could be a gradual, but significant, increase in the potential weed flora over a number of seasons. Field trials were carried out in 2000 and 2001 to quantify the potential magnitude of this weed seed return from Chenopodium album L., grown at two planting densities either in pure stands or in competition with one of two crops (cabbage or onion). Crop and weed weights and weed seed production were notably greater in 2001. Both dry weight and seed production of C. album were suppressed by increasing planting density or by the presence of crop, with cabbage having a more suppressive effect. Despite the plasticity in seed production, a linear relationship was demonstrated between log weed seed production and log weed biomass that was robust over a range of competitive situations with onion and cabbage, at different planting densities and in growing seasons. The study also demonstrated that the relationship could be combined with an existing simple competition model to allow the consequences of incomplete weed control to be assessed in terms of potential weed seed return.

show abstract

Influence of cohorts onChenopodium albumdemography

Cited by 30 publications

References 27 publications

ExploringChenopodium albumadaptive traits in response to light and temperature stresses

ExploringChenopodium albumadaptive traits in response to light and temperature stresses

Life-history variation in the short-lived herb Rorippa palustris: effect of germination date and injury timing

Seed production of Chenopodium album in competition with field vegetables

Contact Info

Product

Resources

About