Application of half-sib mating for genetic analysis of forage yield and related traits in Bromus inermis

Araghi, Bahram; Barati, Mohammad; Majidi, Mohammad Mahdi; Mirlohi, Aghafakhr

doi:10.1007/s10681-013-1011-2

Cited by 34 publications

(58 citation statements)

References 23 publications

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“…The most convenient way to assess the heritability of a trait is to use clonal material, which is easily obtained in many forage plants by splitting a plant into ramets of one or more tillers. In the present study, estimation of broad-sense heritability for DMY (h 2 = 0.21-0.29) and LSR (h 2 = 0.3) were almost similar to the estimates by Julier et al (2000) in alfalfa, Ebrahimiyan et al (2012) in tall fescue, and Araghi et al (2014) in smooth bromegrass (Bromus inermis). On the basis of clonal material, variances can be estimated and used to calculate heritability (Wricke and Weber, 1986;Nyquist, 1991).…”

Section: Discussionsupporting

confidence: 82%

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Response to Drought Stress in Sainfoin: Within and Among Ecotype Variation

et al. 2015

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Ecotypes of sainfoin (Onobrychis viciifolia Scop.) have not been extensively studied, and knowledge about their variation is generally limited. In the present study, 100 sainfoin genotypes from 10 ecotypes were clonally propagated and evaluated under water‐stressed and nonstressed conditions for 2 yr. Among‐ and within‐ecotype variation plus heritability of agronomic, morphological, and physiological traits were estimated and the associations of traits were determined. For most of the measured traits among‐ and within‐ecotype effects were significant. The variance within ecotypes was at least four times higher for most of the measured traits when compared with variance among ecotypes. The within‐ecotype contribution was 67 to 71% for dry matter yield (DMY), 69% for number of stems per plant, and 69 to 91% for morphological traits. Large within‐ecotype variation for DMY and yield‐related traits could express yield stability across environments and maximize genetic progress per breeding cycle. The lowest heritability estimates were obtained for DMY and leaf‐to‐stem ratio, and the highest one was estimated for antioxidant activity and chlorophyll content. Water stress caused significant decrease in all measured traits except for carotenoid content, proline content, catalase, ascorbate peroxidase, and superoxide dismutase activity. Genotypic differences for water‐stress tolerance identified in this study were mainly attributed to the ability of tolerant ecotypes to accumulate a greater amount of proline in their leaves in response to water stress. Dry matter yield had positive correlations with plant height, inflorescence length, number of stems per plant, and proline content under both moisture environments. On the basis of factor analysis, the first three factors in both environments were considered as “forage yield components,” “photosynthetic pigments,” and “antioxidant activity.” High within‐ecotype variation indicated the importance of selection within populations for suitable parental materials in sainfoin breeding. Baft was the best ecotype under both moisture environments in this respect.

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Section: Discussionsupporting

confidence: 82%

“…Correlations among traits have been estimated in many forage plants (Majidi et al, 2009;Amini et al, 2013;Araghi et al, 2014). In addition, selection could be practiced on a highly heritable trait that is correlated to a more complex trait such as yield with a lower heritability.…”

Section: Discussionmentioning

confidence: 99%

Response to Drought Stress in Sainfoin: Within and Among Ecotype Variation

et al. 2015

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“…de Araujo and Coulman (2002) reported that genetic variation estimates for dry matter yield were negative for polycross populations, not significant for OP populations, and significant for selfed progenies in meadow bromegrass (Bromus riparius Rehmann). In smooth bromegrass half-sib progeny, Araghi et al (2014) reported relatively high narrow-sense heritability for days to inflorescence emergence (DIE), days to anthesis (DA), panicle length, spread, mean percentage of dry matter, and dry matter yield for the first cut (>0.60). In smooth bromegrass half-sib progeny, Araghi et al (2014) reported relatively high narrow-sense heritability for days to inflorescence emergence (DIE), days to anthesis (DA), panicle length, spread, mean percentage of dry matter, and dry matter yield for the first cut (>0.60).…”

Section: Genetics Of Inbreeding Effects In Smooth Bromegrassmentioning

confidence: 99%

“…This can target particular populations rather than searching among all possible populations for high-yielding hybrids (Brummer, 1999). Araghi et al (2014) showed that the mean for TDMY of bromegrass in parent was higher than their polycross families. Because the populations used in the present study were collected from Iran and other countries, it is possible that the combination (mean) of all together did not show heterosis.…”

Section: Inbreeding Depression Magnitude and Variationmentioning

confidence: 99%

“…In this study, different estimates of heritability were obtained for the S 1 and OP progenies and parental clones. Traits under complex genetic control, such as forage yield, have reportedly low to moderate heritability values, whereas high values have been obtained for others such as PH (Majidi et al, 2009;Amini et al, 2013;Araghi et al, 2014). In the S 1 progenies, moderate to high values of broad-sense heritability (>0.5) were recorded for DIE, DA, PH, NS, spread, and TDMY, whereas moderate to low values were measured for DMYC1, DMYC2, and MPDM.…”

Section: Genetic Analysis Of Traitsmentioning

confidence: 99%

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Genetics of Inbreeding Effects in Smooth Bromegrass

2018

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Limited knowledge is available on the effects of deliberate selfing on morphological traits and genetic parameters in smooth bromegrass (Bromus inermis Leyss). To gain an enhanced understanding of these effects, 25 parental clones of smooth bromegrass along with 25 full‐sib (S1) and 25 half‐sib (open‐pollinated [OP]) progenies were generated in 2012 and used to assess the consequences of first‐generation inbreeding during 2013 and 2014 in a field experiment. A high genetic variation was observed among and within the S1 and OP progenies and parental clones. Different levels of inbreeding depression were observed for traits of days to anthesis, plant height, spread, and dry matter yield. Principal component analysis separated lines into three groups roughly corresponding to S1, OP, and parental clones, indicating that changes in mating system could rapidly change the genetic structure of populations. Large genetic variations were observed for inbreeding depression among the parental clones. Heritabilities ranged from 0.16 for dry matter (%) to 0.85 for spreading ability. The self‐pollinated progenies exhibited a higher heritability than the other progenies. The high correlations of forage yield with plant height, number of shoots per plant, and spread make it possible to improve forage yield via indirect selection. Results indicated that the magnitude of inbreeding depression varied among the genotypes and traits. Therefore, selection for low inbreeding depression rates is possible in this species, which may facilitate development of inbred lines for future breeding studies.

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Influence of water deficit and defoliation managements on post‐drought recovery and persistence of smooth bromegrass

et al. 2020

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In arid and semiarid regions, successful recovery from drought may be of more economic significance than plant productivity during a dry season. This research was conducted to investigate the effects of pre-drought irrigation and defoliation managements (seed and forage managements) on post-drought recovery of diverse smooth bromegrass (Bromus inermis Leyss.) genotypes, and to identify growth traits associated with persistence and recovery as indices for selecting superior genotypes. Thirty-six genotypes were field evaluated in two separate experiments of seed and forage managements during 2013-2015 under well-watered and deficit irrigation regimes. In the fourth year (2016), irrigation was withheld from both moisture regimes for two months (almost complete senescence) and then plants were re-watered to find the effect of prolonged drought stress on post-drought recovery. Pre-drought irrigation increased persistence of genotypes relative to the well-watered treatment in the seed management experiment. In the seed management trial, genotypes had greater recovery under deficit irrigation when compared to forage management counterpart. There was no significant difference between seed and forage management experiments under the well-watered regime in this respect. Positive correlations were observed between recovery after prolonged drought and total aerial biomass, persistence, and winter growth vigor under both irrigation regimes. Superior genotypes were identified as having more productivity, better recovery, higher persistence, and drought tolerance.

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Application of half-sib mating for genetic analysis of forage yield and related traits in Bromus inermis

Cited by 34 publications

References 23 publications

Response to Drought Stress in Sainfoin: Within and Among Ecotype Variation

Response to Drought Stress in Sainfoin: Within and Among Ecotype Variation

Genetics of Inbreeding Effects in Smooth Bromegrass

Influence of water deficit and defoliation managements on post‐drought recovery and persistence of smooth bromegrass

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