Long-term effects of an increased CO2 concentration on terrestrial plants in model ecosystems. Morphology and reproduction ofTrifolium repens L.and Lolium perenne L.

1986 ◽  
Vol 30 (4) ◽  
pp. 323-332 ◽  
Author(s):  
D. Overdieck
Keyword(s):  
Lolium Perenne ◽  
Co2 Concentration ◽  
Long Term Effects ◽  
Terrestrial Plants ◽  
Lolium Perenne L ◽  
Model Ecosystems ◽  
Increased Co2 Concentration

scholarly journals Identifying morphological traits associated with vegetative persistence in the perennial ryegrass (Lolium perenne L.) cultivar 'Grasslands Samson'

2020 ◽  
Vol 82 ◽  
pp. 139-147
Author(s):  
Jessica R. O'Connor ◽  
James R. Crush ◽  
Zulfi Jahufer
Keyword(s):  
Lolium Perenne ◽  
Perennial Ryegrass ◽  
Morphological Traits ◽  
Genotypic Variation ◽  
Dry Weight ◽  
Tiller Number ◽  
Future Research ◽  
Lolium Perenne L ◽  
Genetic Shift

Perennial ryegrass (Lolium perenne L.) vegetative persistence (maintained herbage growth and survival without reseeding) is an important economic trait for farmers in New Zealand as it decreases the frequency of reseeding pastures. Vegetative persistence is difficult to breed for due to a lack of long-term trials to observe the complex interactions between plant genotype and the environment. In a long-term trial a genetic shift in the sown cultivar population could occur as individual plants with advantageous traits outcompete other plants and survive. The objectives of our study were to investigate the occurrence of a potential genetic shift in a sample (30 plants) of a persistent population of ‘Grasslands Samson’ perennial ryegrass. Persistent plants were collected from a nine-year-old trial at Poukawa, Hawke's Bay. To identify a genetic shift, these plants were compared to a sample of 30 plants sourced from commercial seed of ‘Grasslands Samson’ representing the original population. This study estimated genotypic variation within and between the populations for eight morphological traits after 10 weeks' growth under glasshouse conditions. Phenotypic and genotypic correlations between the traits were estimated. Results showed that the persistent population had significantly (P<0.05) greater means for tiller number, reproductive tiller number, lamina sheath length, and dry weight. Future research studying these traits across farm environments would further understanding of their roles in vegetative persistence of ryegrass.

Stable transformation and long-term expression of the gusA reporter gene in callus lines of perennial ryegrass (Lolium perenne L.)

1994 ◽  
Vol 24 (2) ◽  
pp. 401-405 ◽  
Author(s):  
Heleen M. van der Maas ◽  
Eliza R. de Jong ◽  
Saskia Rueb ◽  
Lambert A. M. Hensgens ◽  
Frans A. Krens
Keyword(s):  
Reporter Gene ◽  
Lolium Perenne ◽  
Perennial Ryegrass ◽  
Stable Transformation ◽  
Lolium Perenne L ◽  
Gusa Reporter Gene ◽  
Callus Lines

Effects of long-term elevated atmospheric CO2 concentration on Lolium perenne and Trifolium repens canopies in the course of a terminal drought stress period

1989 ◽  
Vol 67 (9) ◽  
pp. 2720-2725 ◽  
Author(s):  
I. Nijs ◽  
I. Impens ◽  
T. Behaeghe
Keyword(s):  
Drought Stress ◽  
Lolium Perenne ◽  
Trifolium Repens ◽  
Co2 Concentration ◽  
Stress Regime ◽  
Growth Environment ◽  
Elevated Atmospheric Co2 ◽  
Terminal Drought ◽  
Terminal Drought Stress

A terminal drought stress regime was imposed on vegetatively fully developed Lolium perenne L. cv. Vigor and Trifolium repens L. cv. Blanca canopies in semicontrolled growth chambers that provided a high (626 ± 50 μL∙L−1) and an ambient (358 ± 35 μL∙L−1) CO2 growth environment. The chambers served as measurement units in an open system for continuous CO2 and water vapour exchange assessment. When stress was building up, high CO2 increased the ratio of real to potential canopy evapotranspiration in both species, thus reducing the higher potential rates that are generally observed in high CO2 under unstressed conditions towards the level of the ambient CO2 stands, without immediately affecting the net higher CO2 exchange rates that characterize the high CO2 treatment. Lolium perenne is more sensitive to drought stress in its initial response and divides the available amount of water more proportionally over the stress period than Trifolium repens. Water-use efficiency is roughly doubled and is affected later by drought stress in high CO2 for both species. It is concluded that long-term high CO2 treatment favours the survival of the species examined when exposed to severe, rapidly developing drought stress.

scholarly journals SChlorophyll a fluorescence of perennial ryegrass (Lolium perenne L.) varieties under long term exposure to shade

2015 ◽  
Vol 102 (3) ◽  
pp. 305-312 ◽  
Author(s):  
Piotr Dąbrowski ◽  
Bogumila Pawluśkiewicz ◽  
Aneta Helena Baczewska ◽  
Pawel Oglęcki ◽  
Hazem Kalaji
Keyword(s):  
Lolium Perenne ◽  
Perennial Ryegrass ◽  
Lolium Perenne L

Ovarian Dysfunction in Fetally Irradiated Beagles

1977 ◽  
Vol 35 ◽  
pp. 658-659
Author(s):  
T. M. Seed ◽  
M. H. Sanderson ◽  
D. L. Gutzeit ◽  
T. E. Fritz ◽  
D. V. Tolle ◽  
...  
Keyword(s):  
Gamma Rays ◽  
Low Dose ◽  
Long Term Effects ◽  
Ovarian Dysfunction ◽  
Dose Rates ◽  
Highly Sensitive ◽  
Microscopic Evaluation ◽  
Ovarian Pathology ◽  
Normal Offspring

The developing mammalian fetus is thought to be highly sensitive to ionizing radiation. However, dose, dose-rate relationships are not well established, especially the long term effects of protracted, low-dose exposure. A previous report (1) has indicated that bred beagle bitches exposed to daily doses of 5 to 35 R 60Co gamma rays throughout gestation can produce viable, seemingly normal offspring. Puppies irradiated in utero are distinguishable from controls only by their smaller size, dental abnormalities, and, in adulthood, by their inability to bear young.We report here our preliminary microscopic evaluation of ovarian pathology in young pups continuously irradiated throughout gestation at daily (22 h/day) dose rates of either 0.4, 1.0, 2.5, or 5.0 R/day of gamma rays from an attenuated 60Co source. Pups from non-irradiated bitches served as controls. Experimental animals were evaluated clinically and hematologically (control + 5.0 R/day pups) at regular intervals.

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