Phosphate responses of some Trifolium repens×T. uniflorum interspecific hybrids grown in soil

Nichols, S. N.; Crush, J. R.; Ouyang, L.

doi:10.1071/cp14029

Cited by 17 publications

(23 citation statements)

References 20 publications

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“…The degree of root system plasticity in response to drying conditions is unknown for T. repens Â T. uniflorum hybrids, and could alter the root distribution observed here (Pang et al, 2011). Given the positive effects of P on drought stress in white clover (Singh et al, 1997;Singh and Sale, 1998) and evidence for drought resistance and low P tolerance in the hybrids (Nichols et al, 2014a(Nichols et al, , b, c, 2015a, the potential for drought stress to be ameliorated by low soil P tolerance in this material requires further investigation.…”

Section: Root Distributionmentioning

confidence: 99%

Rooting depth and root depth distribution ofTrifolium repens×T. unifloruminterspecific hybrids

Nichols

Hofmann

Williams

et al. 2016

Ann Bot

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Background and aims Traits related to root depth distribution were examined in Trifolium repens Â T. uniflorum backcross 1 (BC 1 ) hybrids to determine whether root characteristics of white clover could be improved by interspecific hybridization.Methods Two white clover cultivars, two T. uniflorum accessions and two BC 1 populations were grown in 1 -m deep tubes of sand culture. Maximum rooting depth and root mass distribution were measured at four harvests over time, and root distribution data were fitted with a regression model to provide measures of root system shape. Morphological traits were measured at two depths at harvest 3.Key Results Root system shape of the hybrids was more similar to T. uniflorum than to white clover. The hybrids and T. uniflorum had a higher rate of decrease in root mass with depth than white clover, which would result in higher proportions of root mass in the upper profile. Percentage total root mass at 100-200 mm depth was higher for T. uniflorum than white clover, and for Crusader BC 1 than 'Crusader'. Roots of the hybrids and T. uniflorum also penetrated deeper than those of white clover. T. uniflorum had thicker roots at 50-100 mm deep than the other entries, and more of its fine root mass at 400-500 mm. The hybrids and white clover had more of their fine root mass higher in the profile. Consequently, T. uniflorum had a higher root length density at 400-500 mm than most entries, and a smaller decrease in root length density with depth.Conclusions These results demonstrate that rooting characteristics of white clover can be altered by hybridization with T. uniflorum, potentially improving water and nutrient acquisition and drought resistance. Root traits of T. uniflorum are likely to be adaptations to soil moisture and fertility in its natural environment.

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Section: Root Distributionmentioning

confidence: 99%

Rooting depth and root depth distribution ofTrifolium repens×T. unifloruminterspecific hybrids

Nichols

Hofmann

Williams

et al. 2016

Ann Bot

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“…According to current knowledge, hybrids created with close relatives of white clover nodulate freely with Rhizobium strains effective on white clover. Nichols et al (2014a) found evidence that nitrogen fixation did not differ between T. repens · T. uniflorum hybrids and white clover in the field. Even so, ongoing monitoring of nitrogen-fixation capacity would be prudent with this novel germplasm.…”

Section: Utilising Genetic Resourcesmentioning

confidence: 85%

“…Under glasshouse conditions, some T. repens · T. uniflorum first-generation backcross hybrids had greater growth than did white clover under low external phosphate supplies in soil and sand culture, including low to intermediate soil Olsen phosphorus (P) levels (Nichols et al 2014a(Nichols et al , 2014d. For example, one hybrid family had shoot dry weights that were, on average, 17% higher than for white clover at Olsen soil P levels of 9-20.…”

Section: Utilising Genetic Resourcesmentioning

confidence: 99%

“…This may be due in part to differences in internal phosphate-use efficiency. Root characteristics associated with increased P acquisition, such as a highly flexible root : shoot ratio and increased root branching, have also been observed (Nichols et al 2014a). According to current knowledge, hybrids created with close relatives of white clover nodulate freely with Rhizobium strains effective on white clover.…”

Section: Utilising Genetic Resourcesmentioning

confidence: 99%

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Breaking through the feed barrier: options for improving forage genetics

et al. 2015

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Abstract. Pasture based on perennial ryegrass (Lolium perenne L.) and white clover (Trifolium repens L.) is the foundation for production and profit in the Australasian pastoral sectors. The improvement of these species offers direct opportunities to enhance sector performance, provided there is good alignment with industry priorities as quantified by means such as the forage value index. However, the rate of forage genetic improvement must increase to sustain industry competitiveness. New forage technologies and breeding strategies that can complement and enhance traditional approaches are required to achieve this. We highlight current and future research in plant breeding, including genomic and gene technology approaches to improve rate of genetic gain. Genomic diversity is the basis of breeding and improvement. Recent advances in the range and focus of introgression from wild Trifolium species have created additional specific options to improve production and resource-use-efficiency traits. Symbiont genetic resources, especially advances in grass fungal endophytes, make a critical contribution to forage, supporting pastoral productivity, with benefits to both pastures and animals in some dairy regions. Genomic selection, now widely used in animal breeding, offers an opportunity to lift the rate of genetic gain in forages as well. Accuracy and relevance of trait data are paramount, it is essential that genomic breeding approaches be linked with robust field evaluation strategies including advanced phenotyping technologies. This requires excellent data management and integration with decision-support systems to deliver improved effectiveness from forage breeding. Novel traits being developed through genetic modification include increased energy content and potential increased biomass in ryegrass, and expression of condensed tannins in forage legumes. These examples from the wider set of research emphasise forage adaptation, yield and energy content, while covering the spectrum from exotic germplasm and symbionts through to advanced breeding strategies and gene technologies. To ensure that these opportunities are realised on farm, continuity of industry-relevant delivery of forage-improvement research is essential, as is sustained research input from the supporting pasture and plant sciences.

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“…Also in this species, root traits have been shown to affect the uptake of nutrients such as P (Nichols et al. ,b). In this case, root length and frequency of branching were identified as the key traits for P uptake.…”

Section: Implications For Plant Breeding Programsmentioning

confidence: 99%

A new emphasis on root traits for perennial grass and legume varieties with environmental and ecological benefits

Marshall

Collins

Humphreys

et al. 2016

Food and Energy Security

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Grasslands cover a significant proportion of the agricultural land within the UK and across the EU, providing a relatively cheap source of feed for ruminants and supporting the production of meat, wool and milk from grazing animals. Delivering efficient animal production from grassland systems has traditionally been the primary focus of grassland‐based research. But there is increasing recognition of the ecological and environmental benefits of these grassland systems and the importance of the interaction between their component plants and a host of other biological organisms in the soil and in adjoining habitats. Many of the ecological and environmental benefits provided by grasslands emanate from the interactions between the roots of plant species and the soil in which they grow. We review current knowledge on the role of grassland ecosystems in delivering ecological and environmental benefits. We will consider how improved grassland can deliver these benefits, and the potential opportunities for plant breeding to improve specific traits that will enhance these benefits whilst maintaining forage production for livestock consumption. Opportunities for exploiting new plant breeding approaches, including high throughput phenotyping, and for introducing traits from closely related species are discussed.

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Phosphate responses of some Trifolium repens×T. uniflorum interspecific hybrids grown in soil

Cited by 17 publications

References 20 publications

Rooting depth and root depth distribution ofTrifolium repens×T. unifloruminterspecific hybrids

Rooting depth and root depth distribution ofTrifolium repens×T. unifloruminterspecific hybrids

Breaking through the feed barrier: options for improving forage genetics

A new emphasis on root traits for perennial grass and legume varieties with environmental and ecological benefits

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