Biomass Yield Heterosis in Lowland Switchgrass

Bhandari, Hem S.; Nayak, Santosh; Dalid, Cheryl; Sykes, Virginia R.

doi:10.2135/cropsci2017.02.0080

Cited by 11 publications

(26 citation statements)

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“…Common switchgrass breeding methods include recurrent phenotypic selection with some restrictions and among‐and‐within‐family (AWF) selection methods (Vogel and Burson, 2004 ; Casler and Brummer, 2008). The potential of exploiting biomass heterosis in crosses between ecotypes or between strains within ecotypes have been documented (Vogel and Mitchell, 2008; Casler, 2014; Bhandari et al, 2017).…”

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Genetic Variation and Expected per Cycle Biomass Yield Gain in Lowland Switchgrass

et al. 2018

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Switchgrass (Panicum virgatum L.), a native of the North American prairies, has been selected for bioenergy research. With a focus on biomass yield improvement, this study aim (i) to estimate the genetic variation in biomass yield and important agronomic traits in ‘Alamo’, (ii) to determine correlations between biomass yield and agronomic traits, and (iii) to compare efficiency of phenotypic selection from a sward plot and advanced cycle half‐sibs (ACHS) on the basis of space‐plant performance. Sixty‐two Alamo half‐sib families (AHS) from a 4‐yr‐old Alamo sward and 20 advanced cycle half‐sib families (ACHS) were evaluated in replicated field trials under simulated swards in Knoxville and Crossville, TN. Results showed significant variation (P < 0.05) among AHS for biomass yield, tillering ability, and spring vigor, suggesting the importance of additive genetic variation in these traits. Overall mean biomass yield of AHS was not different from the Alamo control, demonstrating the inefficiency of phenotypic selection from swards. Mean biomass yield of ACHS was 15 and 20% less than that of the control and AHS, respectively. Such results could be attributable to the influence of environment and genotype × environment interaction. However, results showed great potential for biomass yield improvement through selection on the basis of family performance. Using 10% selection intensity, parental control of two, and a narrow‐sense heritability estimate of 0.11, gain per cycle selection from half‐sib family selection is estimated to be 23%. Spring vigor showed potential use for indirect selection due to its high genetic correlation (rG = 0.75) with biomass yield. However, it is impeded by the low heritability estimate (h2 = 0.34).

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Genetic Variation and Expected per Cycle Biomass Yield Gain in Lowland Switchgrass

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“…It appears that lowland switchgrass can be divided into two broad populations, including those from the south related to 'Alamo' like 'Cimarron' and the northern populations related to 'Kanlow' such as 'BoMaster' and 'Performer'. It was between these populations, 'Alamo' and 'Kanlow', that midparent heterosis was found and one of the crosses showed 23% high parent heterosis (Bhandari et al, 2017).…”

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confidence: 96%

“…The immediate benefit of such diversity information will be in the development of advanced inbreds [selfing generations 5 to 6 (S5 to S6)] which can be used to produce hybrids for harnessing hybrid vigor. Bhandari, Nayak, Dalid & Sykes (2017) found up to 23% high parent heterosis from a cross between selections of divergent populations of switchgrass. Inbred populations can be utilized in the development of linkage maps (Liu, Wu, Wang & Samuels, 2012) and identification of quantitative trait loci (QTL) associated with agronomic, quality and disease traits.…”

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confidence: 95%

Genetic Variation Within and Among Lowland Switchgrass Cultivars as Revealed With AFLP Polymorphisms

Makaju¹,

Anderson³

et al. 2020

Global J. Ag. Allied Sc.

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Switchgrass (Panicum virgatum L.) has gained wider attention due to its recognition and use as a model herbaceous crop species for bioenergy production. Genetic diversity information in lowland switchgrass cultivars can help to specify cultivars to be used in the breeding programs aiming for hybrid vigor. The objective of this research was to analyze genetic variation within and among five lowland switchgrass cultivars using amplified fragment length polymorphism (AFLP) markers. AFLP polymorphisms indicated the presence of high genetic variation within lowland switchgrass cultivars with ‘Alamo’ exhibiting the highest genetic variation and ‘Performer’ the lowest. The Nei’s genetic diversity parameters revealed the lowest genetic distance between cultivars ‘Alamo’ and ‘Cimarron’ and the highest value between cultivars ‘Alamo’ and ‘Kanlow’. ‘Alamo’ and ‘Cimarron’ were clustered together while ‘BoMaster’, ‘Kanlow’, and ‘Performer’ were grouped into the other cluster. In addition, there were clusters with mixed genotypes. The findings of this study can be used to select diverse lines as parents for heterosis and inbreeding studies.

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“…The objectives of this study were to (a) assess biomass yield heterosis in crosses between parental lines derived from Alamo and Kanlow and (b) measure the association between simpler agronomic traits and biomass yield of the crosses in a simulated‐sward planting. Alamo and Kanlow biparental crosses were generated in the fall of 2012 and 2013 (Bhandari et al., 2017). Forty‐four crosses between randomly selected genotypes derived from Alamo and Kanlow were evaluated under simulated‐sward conditions in 2014 and 2015.…”

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confidence: 99%

Heterosis for biomass yield and other traits in ‘Alamo’ × ‘Kanlow’ switchgrass populations

et al. 2021

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Heterosis plays an important role in switchgrass (Panicum virgatum L.) breeding. To identify superior clones for hybrid development through seasonal single cut, 10 crosses derived from ‘Alamo’ × ‘Kanlow’ and parents were evaluated. The experiment was planted in 2018 using a randomized complete block design with two replications at two locations in Tennessee: the East Tennessee Research and Education Center (ETREC), Knoxville, and the Plateau Research and Education Center (PREC), Crossville. The crosses and their parents were evaluated for biomass yield, plant height, and clonal mass in the fall of 2019 and 2020. The crosses were significantly different in biomass yield within and across locations (P ≤ .05). Average biomass yield of the crosses ranged from 7.1 to 8.7 Mg ha−1 at ETREC and from 10.0 to 11.8 Mg ha−1 at PREC. The crosses demonstrated an average of 46% mid‐parent heterosis (MPH) and 24% high‐parent heterosis (HPH) for biomass yield across the two locations. The MPH and HPH were 3 and −1.3% for plant height and 12 and 1% for clonal mass, respectively. Moderate to strong positive association was found between clonal mass scores and biomass yield at individual locations across years and across locations and years (r = 0.37–0.79, P ≤ .05). The association between biomass yield and plant height was inconsistent (r = −0.24 to 0.67, P ≤ .05). The findings of biomass yield heterosis in these crosses suggested the potential of hybrid cultivars for biomass yield improvement in lowland switchgrass.

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Biomass Yield Heterosis in Lowland Switchgrass

Cited by 11 publications

References 37 publications

Genetic Variation and Expected per Cycle Biomass Yield Gain in Lowland Switchgrass

Genetic Variation and Expected per Cycle Biomass Yield Gain in Lowland Switchgrass

Genetic Variation Within and Among Lowland Switchgrass Cultivars as Revealed With AFLP Polymorphisms

Heterosis for biomass yield and other traits in ‘Alamo’ × ‘Kanlow’ switchgrass populations

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