GENETIC VARIATION AND CORRELATION OF AGRONOMIC TRAITS IN TALL FESCUE (<i>Festuca arundinacea</i> Schreb.) GERMPLASM

Araújo, M. R. A. de; Coulman, Bruce; Faris, M. A.; Wrobel, C.

doi:10.4141/cjps83-052

Cited by 9 publications

(7 citation statements)

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“…Knowles (1950) also found a high correlation between forage yield and spread, while Nielson and Smith (1961) reported that forage yield was correlated with spread, fall vigour and plant height in smooth bromegrass. De Arau´jo et al (1983) questioned whether this correlation would apply to sward conditions where plant densities and competition are much higher than in a spaced-planted nursery.…”

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confidence: 99%

Genetic variation, heritability and progeny testing in meadow bromegrass

Araújo

Coulman

2002

Plant Breeding

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Meadow bromegrass is a recently introduced pasture grass in western Canada. Its leafy production and rapid regrowth have made it a major grass species for pasturing beef animals in this region. Because relatively little breeding work has been done on this species, there is little information on its breeding behaviour. The main objective of this study was to estimate genetic parameters and assess breeding methodologies for meadow bromegrass. Forty half‐sib (polycross and open‐pollinated) and full‐sib (selfed) progenies were evaluated for dry matter and seed yield, fertility index, harvest index, plant height, plant spread, crude protein, neutral detergent fibre and acid detergent fibre. Genetic variation for seed yield, harvest index, and plant height was significant in the open‐pollinated and selfed tests. Genetic variation estimates for dry matter yield were negative (polycross), not significant (open‐pollinated), or significant (selfed). Estimates of genetic variation for quality traits were not significant, except for acid detergent fibre (selfed). Correlations among characters indicated that it is possible to simultaneously improve seed and forage yield. Rankings of progenies by the half‐sib tests for forage and seed yield were not altered by the use of the synthetic parental value (SVi), which includes information from selfed progeny. The polycross progeny test did not discriminate parents as well as the open‐pollinated and selfed tests; this may have been a result of non‐random pollination in the polycross. Correlation among the progeny tests, showed that open‐pollinated and selfed progeny tests agreed for all characters, except for harvest index, while correlation between polycross and selfed tests were significant for six characters but not dry matter yield, and acid and neutral detergent fibres. The most dissimilar tests were polycross and open‐pollinated, with significant correlations found only for fertility index, height, spread and neutral detergent fibre. It was concluded that there was significant variation and moderate heritability for most traits in the meadow bromegrass populations evaluated, and that the open‐pollinated progeny test is the method of choice for selecting parents for synthetics of this species.

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Genetic variation, heritability and progeny testing in meadow bromegrass

Araújo

Coulman

2002

Plant Breeding

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“…On a population mean basis, maturity was significantly correlated with tiller length and flag leaf width and was used as a covariate in the analysis of variance for these two traits. This positive correla- ARAUJO et al (1983). This correlation is based on clonal means; the correlation is only 0.26 when calculated from population means as reported by the authors.…”

Section: Resultsmentioning

confidence: 62%

Genetic Diversity in Tall Fescue Ecotypes from Alabama I. Maturity, Morphological Traits, and Disease Reaction

Santen

Collins

1991

Plant Breeding

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There is a large hectarage of tall fescue in Alabama. Recognition of the deleterious effects of the endophytic fungus Acremonium coenophialum has resulted in substantial acceptance of new endophytefree cultivars. Destruction of old pastures and the concomitant loss of potentially valuable adapted germplasm could be a valid cause for concern. The objectives of this study were to evaluate genetic variation for maturity and plant morphological traits, both among and within tall fescue cv. 'Kentucky 31' populations from 18 to 38 year-old pastures in Alabama. Ten populations of approximately 50 plants each were collected from old Alabama tall fescue pastures. Two pastures were sampled in each of five counties, representing the five major land use areas of the state. In 1990, spaced plants of all populations were evaluated at heading time for maturity, morphological, and disease traits at two locations in central Alabama. Endophyte infection level of the populations ranged from 2 to 100 %. Maturity was highly correlated with tiller length and flag leaf width and was used as a covariate for these traits in the analysis of variance. Leaf rust and net blotch ratings were negatively correlated. Significant variation among populations was observed for maturity and flag leaf dimensions, most variation being due to differences among source counties. Significant variation was observed within all populations for maturity and morphological traits, but only in seven populations for leaf rust. No within-population variation was detected for net blotch. The average precipitation for the month of May explained 81 % of the variation among populations for maturity. Age of the pasture sampled had a significant effect on tiller diameter (r^ = 0.55), and latitude of the pasture sampled was the best individual predictor of leaf width (r^ = 0.42). This study reveals that considerable genetic diversity, largely influenced by climatic conditions, exists among 'Kentucky 31' tall fescue ecotypes from Alabama.

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“…This result was expected because these traits are yield components and they are included in aerial biomass. Araujo et al (1983) also found that plant height and spreading ability were highly correlated with DM yield.…”

Section: Journal Of New Seedsmentioning

confidence: 84%

“…Plant breeders have used the estimation of genetic variance and its additive components for selection proposes in perennial species, because most breeding methods available to the forage breeder make little use of nonadditive genetic variation (Nguyen and Sleper,l983a). Estimates of genetic variation and heritability for both seed and/or herbage yield have been reported for tall fescue by many researchers (Araujo et al, 1983;Nguyen and Sleper, 1983b;Pavetti et al, 1994;Annicchiarico and Romani, 2005) and additive gene action has been the main determinant of variation for many agronomic traits.…”

Section: Journal Of New Seedsmentioning

confidence: 99%

Genetic Variation for and Correlations Among Seed Yield and Seed Components in Tall Fescue

Jafari

Setavarz

Alizadeh

2006

Journal of New Seeds

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To study the genetic variation, heritability and genetic correlations for seed yield and its components (panicles emergence date, anthesis date, panicle number, plant height, panicle length, 1000-grain weight, seed number and seed weight per panicle, harvest index, seed yield, dry matter (DM) yield and fertility index) in tall fescue (Festuca arundinace Schreb), 20 parents were randomly chosen from a genetically broad-based population, and their respective half-sib families were generated. Clonally propagated parents and their half-sib family seeds were grown as individual spaced plants using a randomized completeblock design with two replications in Alborz Research Center, Karaj, Iran, during 2002-2004. The estimates of broad-sense heritability (h b 2 ) were moderate to high for all traits (h b 2 = 0.46-0.82), except harvest index, seed number and seed weight per panicle. Narrow-sense heritability A. A. Jafari and M. A. Alizadeh are affiliated with the Research Institute of Forests and Rangelands, Tehran, Iran.H. Setavarz is a former postgraduate student of Islamic Azad University, Brojerd branch, Iran.

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GENETIC VARIATION AND CORRELATION OF AGRONOMIC TRAITS IN TALL FESCUE (Festuca arundinacea Schreb.) GERMPLASM

Abstract: Ds Aneuro, M. R. A., Cour-rraaN For personal use only.

Cited by 9 publications

References 4 publications

Genetic variation, heritability and progeny testing in meadow bromegrass

Genetic variation, heritability and progeny testing in meadow bromegrass

Genetic Diversity in Tall Fescue Ecotypes from Alabama I. Maturity, Morphological Traits, and Disease Reaction

Genetic Variation for and Correlations Among Seed Yield and Seed Components in Tall Fescue

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