Physiological basis of chilling tolerance and early-season growth in miscanthus

Fonteyne, Simon; Muylle, Hilde; Lootens, Peter; Kerchev, Pavel; Ende, Wim Van den; Staelens, Ariane; Reheul, Dirk; Roldán‐Ruiz, Isabel

doi:10.1093/aob/mcx159

Cited by 10 publications

(7 citation statements)

References 61 publications

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“…When a small number of chilling-tolerant and chilling-sensitive genotypes were compared under field conditions, there appeared to be a trade-off between high photosynthesis and chilling tolerance. The commercial clone M. × giganteus displayed both early season chilling tolerance and, later in the season, high photosynthesis more typical of the chilling-sensitive genotypes (Fonteyne et al , 2018). Drought tolerance is another major opportunity for improvement as M. × giganteus is reported to have poor water-use efficiency, and yield is strongly impacted by water stress (Clifton-Brown and Lewandowski, 2000; Ings et al , 2013).…”

Section: Simultaneous Improvements In Multiple Traits Are Needed For mentioning

confidence: 99%

Genomic index selection provides a pragmatic framework for setting and refining multi-objective breeding targets in Miscanthus

et al. 2018

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Background Miscanthus has potential as a biomass crop but the development of varieties that are consistently superior to the natural hybrid M. × giganteus has been challenging, presumably because of strong G × E interactions and poor knowledge of the complex genetic architectures of traits underlying biomass productivity and climatic adaptation. While linkage and association mapping studies are starting to generate long lists of candidate regions and even individual genes, it seems unlikely that this information can be translated into effective marker-assisted selection for the needs of breeding programmes. Genomic selection has emerged as a viable alternative, and prediction accuracies are moderate across a range of phenological and morphometric traits in Miscanthus, though relatively low for biomass yield per se. Methods We have previously proposed a combination of index selection and genomic prediction as a way of overcoming the limitations imposed by the inherent complexity of biomass yield. Here we extend this approach and illustrate its potential to achieve multiple breeding targets simultaneously, in the absence of a priori knowledge about their relative economic importance, while also monitoring correlated selection responses for non-target traits. We evaluate two hypothetical scenarios of increasing biomass yield by 20 % within a single round of selection. In the first scenario, this is achieved in combination with delaying flowering by 44 d (roughly 20 %), whereas, in the second, increased yield is targeted jointly with reduced lignin (–5 %) and increased cellulose (+5 %) content, relative to current average levels in the breeding population.Key ResultsIn both scenarios, the objectives were achieved efficiently (selection intensities corresponding to keeping the best 20 and 4 % of genotypes, respectively). However, the outcomes were strikingly different in terms of correlated responses, and the relative economic values (i.e. value per unit of change in each trait compared with that for biomass yield) of secondary traits included in selection indices varied considerably.ConclusionsAlthough these calculations rely on multiple assumptions, they highlight the need to evaluate breeding objectives and explicitly consider correlated responses in silico, prior to committing extensive resources. The proposed approach is broadly applicable for this purpose and can readily incorporate high-throughput phenotyping data as part of integrated breeding platforms.

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Section: Simultaneous Improvements In Multiple Traits Are Needed For mentioning

confidence: 99%

Genomic index selection provides a pragmatic framework for setting and refining multi-objective breeding targets in Miscanthus

et al. 2018

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“…However, the unfavorable climatic conditions limited the biomass yield of Miscanthus × giganteus and tolerance to drought and cold due to the single genotype [ 21 , 22 ]. The cultivation of Miscanthus species with stress tolerance has been proved an imperative event to ensure high biomass yields in harsh environments [ 18 , 23 , 24 , 25 ].…”

Section: Introductionmentioning

confidence: 99%

Water Use Efficiency and Stress Tolerance of the Potential Energy Crop Miscanthus lutarioriparius Grown on the Loess Plateau of China

Zhao

Kang

Wang

et al. 2021

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As a potential energy crop with high biomass yield, Miscanthus lutarioriparius (M. lutarioriparius), endemic to the Long River Range in central China, needs to be investigated for its acclimation to stressful climatic and soil conditions often found on the marginal land. In this study, traits related to acclimation and yield, including survival rates, plant height (PH), stem diameter (SD), tiller number (TN), water use efficiency (WUE), and photosynthetic rates (A), were examined for 41 M. lutarioriparius populations that transplanted to the arid and cold Loess Plateau of China. The results showed that the average survival rate of M. lutarioriparius populations was only 4.16% over the first winter but the overwinter rate increased to 35.03% after the second winter, suggesting that plants having survived the first winter could have acclaimed to the low temperature. The strikingly high survival rates over the second winter were found to be 95.83% and 80.85%, respectively, for HG18 and HG39 populations. These populations might be especially valuable for the selection of energy crops for such an area. Those individuals surviving for the two consecutive winters showed significantly higher WUE than those measured after the first winter. The high WUE and low stomatal conductance (gs) observed in survived individuals could have been responsible for their acclimation to this new and harsh environment. A total of 61 individuals with productive growth traits and strong resistance to cold and drought were identified for further energy crop development. This study showed that the variation of M. lutarioriparius held great potential for developing energy crops following continuous field selection.

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“…Miscanthus is perennial and develops yield over a longer period than conventional annual grain crops, and as such, the importance of some trait-to-yield associations may be expected to be different. To test this, a large number of phenotypic traits associated with yield accumulation [17][18][19][20], and complex traits such as seasonal duration and harvestable yield [21][22][23] have been measured in diverse miscanthus populations. A number of studies have examined responses to, and genotypic variation in traits associated with, drought [24][25][26][27][28][29].…”

Section: Introductionmentioning

confidence: 99%

Morphological and Physiological Traits that Explain Yield Response to Drought Stress in Miscanthus

2020

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Miscanthus is a high yielding perennial grass capable of high biomass yields with low inputs. Traits associated with yield have been identified in miscanthus, but less is known about the traits associated with sustaining biomass production under drought stress. The commercial hybrid M. × giganteus and high yielding examples from the parental species M. sinensis and M. sacchariflorus were grown under well-watered and moderate drought conditions. Growth, morphology, physiology and phenotypic plasticity were analyzed. Functional data were parameterized and a matrix of traits examined for associations with yield, genotype and drought treatment. Phenotypic plasticity was determined, indexes were then calculated to determine the plasticity of trait responses. All genotypes assessed responded to moderate drought stress, and genotypic differences in yield decreased under drought. Genotypes with low tolerance exhibited greater plasticity than highly drought tolerant M. sinensis. In well-watered plants variance in yield was explained by a relatively simple empirical model including stem length and stem number, whereas under drought a more complex model was needed including the addition of leaf area and stomatal conductance data. This knowledge can help us to define ideotypes for drought tolerance and develop miscanthus varieties that sustain high yields across a range of environmental conditions.

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Physiological basis of chilling tolerance and early-season growth in miscanthus

Cited by 10 publications

References 61 publications

Genomic index selection provides a pragmatic framework for setting and refining multi-objective breeding targets in Miscanthus

Genomic index selection provides a pragmatic framework for setting and refining multi-objective breeding targets in Miscanthus

Water Use Efficiency and Stress Tolerance of the Potential Energy Crop Miscanthus lutarioriparius Grown on the Loess Plateau of China

Morphological and Physiological Traits that Explain Yield Response to Drought Stress in Miscanthus

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