Low Temperature Photosynthesis in Successional Winter Annuals

Regehr, David L.; Bazzaz, F. A.

doi:10.2307/1935054

Cited by 97 publications

(47 citation statements)

References 25 publications

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“…This result was well within the range of similar ecosystem, such as humid-temperate pastures (2.88 g CO 2 /(m 2 ·day); Skinner, 2007) and sagebrush-steppe ecosystems (0.68-1.31g CO 2 / (m 2 ·day); Gilmanov et al, 2004). Regehr and Bazzaz (1976) suggested two possible photosynthetic acclimation strategies for over-wintering plants: limiting the photosynthesis with completely dormancy during the winter months or keeping photosynthetic capacity during winter time when the climate conditions were favorable for CO 2 uptake. The study of Kato et al (2005) has indicated that no photosynthesis could be detected during winter under Kobresia meadow ecosystem on the Qinghai-Tibetan plateau.…”

Section: Lawn Nee During the Transition Period From Winter To Springsupporting

confidence: 82%

Soil warming effect on net ecosystem exchange of carbon dioxide during the transition from winter carbon source to spring carbon sink in a temperate urban lawn

Zhou

Wang

Tong

et al. 2012

Journal of Environmental Sciences

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The significant warming in urban environment caused by the combined effects of global warming and heat island has stimulated widely development of urban vegetations. However, it is less known of the climate feedback of urban lawn in warmed environment. Soil warming effect on net ecosystem exchange (NEE) of carbon dioxide during the transition period from winter to spring was investigated in a temperate urban lawn in Beijing, China. The NEE (negative for uptake) under soil warming treatment (temperature was about 5°C higher than the ambient treatment as a control) was -0.71 μmol/(m 2 ·sec), the ecosytem was a CO 2 sink under soil warming treatment, the lawn ecosystem under the control was a CO 2 source (0.13 μmol/(m 2 ·sec)), indicating that the lawn ecosystem would provide a negative feedback to global warming. There was no significant effect of soil warming on nocturnal NEE (i.e., ecosystem respiration), although the soil temperature sensitivity (Q 10 ) of ecosystem respiration under soil warming treatment was 3.86, much lower than that in the control (7.03). The CO 2 uptake was significantly increased by soil warming treatment that was attributed to about 100% increase of α (apparent quantum yield) and A max (maximum rate of photosynthesis). Our results indicated that the response of photosynthesis in urban lawn is much more sensitive to global warming than respiration in the transition period.

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Section: Lawn Nee During the Transition Period From Winter To Springsupporting

confidence: 82%

Soil warming effect on net ecosystem exchange of carbon dioxide during the transition from winter carbon source to spring carbon sink in a temperate urban lawn

Zhou

Wang

Tong

et al. 2012

Journal of Environmental Sciences

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“…Photosynthesis in L. serriola has been quantified both in overwintering rosettes and in the cauline leaves of flowering plants. Regehr and Bazzaz (1976) found that under high solar radiation the temperature of rosette leaves was often 10°C above ambient temperatures when air temperatures were 0 to 10°C in February and March in Illinois. The response time of rosettes to increased irradiance was very rapid, even at low temperatures.…”

Section: Growth and Developmentmentioning

confidence: 99%

The biology of Canadian weeds. 122. Lactuca serriola L.

Weaver¹,

Downs²

2003

Can. J. Plant Sci.

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Weaver, S. E. and Downs, M. P. 2003. The biology of Canadian weeds. 122. Lactuca serriola L. Can. J. Plant Sci. 83: 619-628. Lactuca serriola (prickly lettuce, compass plant) is a winter or summer annual, introduced to Canada from Eurasia, and found in all provinces except Newfoundland. It occupies a variety of disturbed sites, and is becoming an increasing problem in crops grown with reduced tillage. Most seedlings emerge in autumn and form overwintering rosettes, with a smaller peak of emergence in spring. Flowering occurs from July through September. Seed production is proportional to stem height, and ranges up to 200 000 seeds per plant. The wind-dispersed seeds have no primary dormancy and form only a short-term seed bank (1 to 3 yr). Many populations in the western United States and southern Australia have developed resistance to Group 2 herbicides, which inhibit the enzyme acetolactate synthase. Prickly lettuce is closely related to, and inter-fertile with, cultivated lettuce, Lactuca sativa L. On la trouve dans toutes les provinces sauf Terre-Neuve. L'espèce envahit divers lieux perturbés et pose un problème grandissant dans les cultures quand il n'y a pas travail du sol. La plupart des plantules lèvent à l'automne pour former des rosettes qui survivent à l'hiver, mais quelques-unes germent au printemps. La floraison s'étend de juillet à septembre. La production de graines est proportionnelle à la hauteur de la tige et peut atteindre 200 000 par plant. Les semences sont disséminées par le vent et n'ont pas de dormance primaire. Elles ne constituent donc d'une réserve à court terme (de 1 à 3 ans). Maints peuplements de l'ouest des États-Unis et du sud de l'Australie ont développé une résistance aux herbicides du groupe 2, qui inhibent l'acétolactate synthase. La laitue sauvage est étroitement apparentée à la laitue frisée, Lactuca sativa L., les deux espèces se fécondant mutuellement.

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“…Plants of open habitats have been described to respond plastically and acclimate rather quickly to changes in environmental conditions, such as temperature (Regehr and Bazzaz, 1978) and irradiance (Peterson and Bazzaz, 1978). Thus, it was suggested that early successional species would have higher photosynthetic plasticity relative to that of species found in later successional habitats (Bazzaz, 1979;Valladares et al, 2000;Ribeiro et al, 2005).…”

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confidence: 99%

Evidence of higher photosynthetic plasticity in the early successional Guazuma ulmifolia Lam. compared to the late successional Hymenaea courbaril L. grown in contrasting light environments

Portes

Damineli²,

Ribeiro³

et al. 2010

Braz. J. Biol.

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The present study investigated changes in photosynthetic characteristics of Guazuma ulmifolia Lam. (early successional species) and Hymenaea courbaril L. (late successional species) grown in contrasting light conditions as a way of assessing photosynthetic plasticity. Early successional species typically inhabit gap environments being exposed to variability in multiple resources, hence it is expected that these species would show higher photosynthetic plasticity than late successional ones. In order to test this hypothesis, light and CO 2 response curves and chlorophyll content (Chl) were measured in plants grown in high and low light environments. G. ulmifolia presented the highest amounts of both Chl a and b, especially in the low light, and both species presented higher Chl a than b in both light conditions. The Chl a/b ratio was higher in high light leaves of both species and greater in G. ulmifolia. Taken together, these results evidence the acclimation potential of both species, reflecting the capacity to modulate light harvesting complexes according to the light environment. However, G. ulmifolia showed evidence of higher photosynthetic plasticity, as indicated by the greater amplitude of variation on photosynthetic characteristics between environments shown by more significant shade adjusted parameters (SAC) and principal component analysis (PCA). Thus, the results obtained were coherent with the hypothesis that the early successional species G. ulmifolia exhibits higher photosynthetic plasticity than the late successional species H. courbaril.Keywords: leaf gas exchange, light and CO 2 photosynthetic responses, photosynthetic plasticity, plant ecophysiology, tropical forest succession. Evidências de maior plasticidade fotossintética na pioneira

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Low Temperature Photosynthesis in Successional Winter Annuals

Cited by 97 publications

References 25 publications

Soil warming effect on net ecosystem exchange of carbon dioxide during the transition from winter carbon source to spring carbon sink in a temperate urban lawn

Soil warming effect on net ecosystem exchange of carbon dioxide during the transition from winter carbon source to spring carbon sink in a temperate urban lawn

The biology of Canadian weeds. 122. Lactuca serriola L.

Evidence of higher photosynthetic plasticity in the early successional Guazuma ulmifolia Lam. compared to the late successional Hymenaea courbaril L. grown in contrasting light environments

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