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Examining perennial ryegrass (Lolium perenne L.) persistence through comparative genetic analyses of two cultivars after nine years in the field

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Abstract

Perennial ryegrass (Lolium perenne L.) provides a cost-effective forage species for New Zealand farms. Vegetative persistence (maintained herbage growth and survival without reseeding) is an important trait for decreasing costs of pasture establishment. Breeding for vegetative persistence is difficult because of a deficiency of long-term trials to observe the complex interactions between plant genotype and environment. Over time in a long-term trial, a shift in the genetic mean of a cultivar could occur as plants with genetically enhanced persistence traits survive. This study aimed to identify a shift in the genetic mean of two cultivars sown in a long-term trial in Hawkes Bay, New Zealand. Plots of 1 m rows were assessed in a trial for 13 months to compare changes in additive genetic variation (\(\upsigma_{\text{a}}^{2}\)), narrow-sense heritability (\({\text{h}}_{\text{n}}^{2}\)), and trait associations of half-sib (HS) populations generated from “Persistent” plants and commercially bought seed of “Original” cultivars Grasslands Samson and Commando. Significant (P < 0.05) \(\upsigma_{\text{a}}^{2}\) and high levels of \({\text{h}}_{\text{n}}^{2}\) for some populations were identified for scores of herbage growth, leaf width, plant habit and aftermath heading. This study found genetic shifts over time were cultivar specific. Traits that were different between Persistent and Original populations were previously associated with decreased pasture intake. Trait associations and cluster analysis identified HS families that could be used for developing enhanced persistence.

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Acknowledgements

I would like to acknowledge AgResearch for funding of this project through the SSIF Forage Value programme, (Contract No. A19054) and for the use of the facilities at Grasslands campus to complete this work. I am grateful for all the help from Trevor Holloway for doing the tractor work and organising grazing for the field trial when required. I am particularly grateful for all of Catherine McKenzie, Tom Lyons and Marcelo Carena’s help and advice.

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  1. AgResearch Grasslands Research Centre, Palmerston North, PB11008, New Zealand

    J. R. O’Connor, M. Z. Z. Jahufer & T. Lyons

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  1. J. R. O’Connor
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O’Connor, J.R., Jahufer, M.Z.Z. & Lyons, T. Examining perennial ryegrass (Lolium perenne L.) persistence through comparative genetic analyses of two cultivars after nine years in the field. Euphytica 216, 36 (2020). https://doi.org/10.1007/s10681-020-2568-1

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