Untitled

Wilkins, P. W.; Macduff, J. H.; Raistrick, N.; Collison, M.

doi:10.1023/a:1003080007976

Cited by 20 publications

(2 citation statements)

References 23 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In contrast to our study, research by Wilkins et al (1997) and Wilkins et al (2000) has been used as evidence for genotypic differences in the shoot N concentrations of perennial ryegrass. Under hydroponic conditions of constant N availability (10 μM), Wilkins et al (1997) found after 21 days of regrowth that shoot N concentrations of four perennial ryegrass cultivars at the seedling stage differed by up to ~1% N (DM basis). While such differences could not be attributed to yield variation (i.e., tissue dilution), they do not simply imply differences in the shoot N requirements of evaluated cultivars.…”

Section: Discussionmentioning

confidence: 58%

Shoot nitrogen concentrations required for optimal herbage growth of multiple perennial ryegrass (Lolium perenne L.) cultivars relative to modern summer‐active cocksfoot (Dactylis glomerata L.) and tall fescue (Festuca arundinacea Schreb.) cultivars

Langworthy,

Corkrey,

Rawnsley

et al. 2023

Grass and Forage Science

View full text Add to dashboard Cite

One possible approach for improving the nitrogen (N)‐use efficiency of perennial ryegrass (Lolium perenne L.) pastures and reducing environmental N losses is to select cultivars or incorporate alternative pasture species with lower shoot N concentrations. Viability of this strategy depends on herbage production not being unduly compromised. A pot experiment compared the shoot N concentration requirements of a diverse range of perennial ryegrass cultivars to achieve 90% and 99% of the herbage yield maxima achievable within a 20 day regrowth cycle. This research was undertaken to quantify if and what effect Australasian breeding programs have had on the N nutrition of perennial ryegrass. Our experiment found minimal genetic variation in the shoot N concentration requirements for vegetative perennial ryegrass swards to achieve near‐maximum herbage yields of living biomass. Across evaluated cultivars, swards achieving 90% and 99% of herbage yield maxima required minimum shoot N concentrations (on a dry matter basis) of 2.56% and 2.87%, respectively. Our experiment also evaluated the shoot N concentration requirements of modern summer‐active cocksfoot (syn. orchardgrass; Dactylis glomerata L.) and tall fescue (Festuca arundinacea Schreb.) ecotypes. We found their shoot N concentration requirements to achieve optimal herbage growth to be similar to those of perennial ryegrass. Taken together, our results suggest that within the perennial ryegrass genome, and among similar high yielding temperate perennial grasses, there may be limited scope for selecting plants with lower shoot N concentration requirements.

show abstract

Section: Discussionmentioning

confidence: 58%

Shoot nitrogen concentrations required for optimal herbage growth of multiple perennial ryegrass (Lolium perenne L.) cultivars relative to modern summer‐active cocksfoot (Dactylis glomerata L.) and tall fescue (Festuca arundinacea Schreb.) cultivars

Langworthy,

Corkrey,

Rawnsley

et al. 2023

Grass and Forage Science

View full text Add to dashboard Cite

show abstract

“…Sometimes the rates are greater in more intensive systems (Gislum et al, 2003;Gourley et al, 2017). Differences in NUE among perennial ryegrass cultivars after defoliation were reported using hydroponics (Wilkins et al, 1997) and field trials under variable N application rates (Wilkins et al, 2000). The variation among cultivars indicated selection and breeding for improving NUE via GS would be possible.…”

Section: Introductionmentioning

confidence: 99%

Rapid Screening of Nitrogen Use Efficiency in Perennial Ryegrass (Lolium perenne L.) Using Automated Image-Based Phenotyping

et al. 2020

View full text Add to dashboard Cite

Perennial ryegrass (Lolium perenne L.) is a dominant species in temperate Australian pastures. Currently, nitrogenous fertilizers are used to support herbage production for pasture and fodder. Increasing the nitrogen use efficiency (NUE) of pasture grasses could decrease the amount of fertilizer application and reduce nitrogen (N) leaching into the environment. NUE, defined as units of dry matter production per unit of supplied nitrogen, is a complex trait in which genomic selection may provide a promising strategy in breeding. Our objective was to develop a rapid, high-throughput screening method to enable genomic selection for y-60NUE in perennial ryegrass. NUE of 76 genotypes of perennial ryegrass from a breeding population were screened in a greenhouse using an automated imagebased phenomics platform under low (0.5 mM) and moderate (5 mM) N levels over 3 consecutive harvests. Significant (p < 0.05) genotype, treatment, and genotype by treatment interactions for dry matter yield and NUE were observed. NUE under low and moderate N treatments was significantly correlated. Of the seven plant architecture features directly extracted from image analysis and four secondarily derived measures, mean projected plant area (MPPA) from the two side view images had the highest correlation with dry matter yield (r = 0.94). Automated digital image-based phenotyping enables temporal plant growth responses to N to be measured efficiently and non-destructively. The method developed in this study would be suitable for screening large populations of perennial ryegrass growth in response to N for genomic selection purposes.

show abstract

Greenhouse Gas Emissions

Abberton

2013

Genomics and Breeding for Climate-Resilient Crops

View full text Add to dashboard Cite

BackgroundA greenhouse gas (GHG) is an atmospheric gas that slows the rate at which heat radiates into space, thus having a warming effect on the atmosphere. GHGs include water vapor, carbon dioxide (CO 2 ), methane (CH 4 ), nitrous oxide, chlorofluorocarbons (CFCs), hydrofluorocarbons (HFCs) and some other halogenated gases. Greenhouse gases in the atmosphere make the earth considerably warmer than it otherwise would be.1 However, excessive CO 2 emissions have caused an imbalance in the planet's natural ability to absorb or use CO 2 , resulting in steadily increasing CO 2 concentrations. Concentrations of other greenhouse gases are rising as well. Atmospheric concentrations of CO 2 (379ppm) and CH 4 (1774 ppb) in 2005 exceed by far the natural range over the last 650,000 years. Global increases in CO2 concentrations are due primarily to fossil fuel use, with land-use change providing another significant but smaller contribution.2 Emissions of GHGs are substantially larger than emissions of other manmade pollutants. The United States alone released more than 5.7 billion metric tons of CO 2 from combustion in 2005, and net U.S. emissions of GHGs, expressed as CO 2 equivalents, 3 totaled 6.4 billion metric tons in that year.4 This is about 250 times the national emission of other major pollutants such as nitrogen oxides (NO x ), sulfur dioxide (SO 2 ), and volatile organic compounds (VOCs).

show abstract

Untitled

Cited by 20 publications

References 23 publications

Shoot nitrogen concentrations required for optimal herbage growth of multiple perennial ryegrass (Lolium perenne L.) cultivars relative to modern summer‐active cocksfoot (Dactylis glomerata L.) and tall fescue (Festuca arundinacea Schreb.) cultivars

Shoot nitrogen concentrations required for optimal herbage growth of multiple perennial ryegrass (Lolium perenne L.) cultivars relative to modern summer‐active cocksfoot (Dactylis glomerata L.) and tall fescue (Festuca arundinacea Schreb.) cultivars

Rapid Screening of Nitrogen Use Efficiency in Perennial Ryegrass (Lolium perenne L.) Using Automated Image-Based Phenotyping

Greenhouse Gas Emissions

Contact Info

Product

Resources

About