Genotypic variation and selection of traits related to forage yield in tall fescue under irrigated and drought stress environments

Ebrahimiyan, Maryam; Majidi, Mohammad Mahdi; Mirlohi, Aghafakhr

doi:10.1111/j.1365-2494.2012.00869.x

Cited by 39 publications

(52 citation statements)

References 39 publications

(48 reference statements)

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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%

“…The highest PH, IL, NS, NN, DMY, LSR, ProC, and RWC were observed for ecotype 8, which belongs to Baft in Kerman province of Iran. Ebrahimiyan et al (2012) showed that water stress had a negative effect on forage yield and many of the morphological traits in tall fescue (Festuca arundinacea) and reduced the genotypic variation for most of the traits. The lowest NS and DMY were observed for ecotypes 1 (Arak), 3 (Semirom), and 4 (Sanandaj), which belong to cold regions of Iran.…”

Section: Discussionmentioning

confidence: 99%

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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%

Section: Discussionmentioning

confidence: 99%

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

et al. 2015

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“…Tall fescue is not only more drought resistant than Lp, but it also has a higher yield potential (Wilman and Gao, ; Pontes et al ., ; Gilliland et al ., ; Van Eekeren et al ., ). These attributes of tall fescue are being increasingly recognized as an adaptation to moisture stress not only in Europe (Reheul et al ., ) but also in other regions (Scheneiter and Améndola, ; Turner et al ., ; Ebrahimiyan et al ., ).…”

Section: Introductionmentioning

confidence: 97%

Performance and quality of tall fescue (Festuca arundinacea Schreb.) and perennial ryegrass (Lolium perenne L.) and mixtures of both species grown with or without white clover (Trifolium repens L.) under cutting management

Cougnon

Baert²,

Waes

et al. 2013

Grass and Forage Science

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Performance and quality of tall fescue (Festuca arundinacea Schreb.) and perennial ryegrass (Lolium perenne L.) and mixtures of both species grown with or without white clover (Trifolium repens L.) under cutting management Abstract There is increasing interest in tall fescue (Festuca arundinacea Schreb.) in Western Europe and elsewhere, mainly because of its better drought resistance and yield potential compared with perennial ryegrass (Lolium perenne L.). Important drawbacks of tall fescue, compared with perennial ryegrass, are its lower digestibility and voluntary intake. Mixtures of both species might combine the advantages of each, and species interactions may eventually lead to transgressive overyielding. We compared the agronomic performance of tall fescue, perennial ryegrass and tall fescue-perennial ryegrass mixtures, as pure-grass swards or in association with white clover (Trifolium repens L.). Tall fescue-perennial ryegrass mixtures differed in the proportion and ploidy of the perennial ryegrass component. Yield, feed quality and botanical composition were measured in the 3 years after the sowing year. We found significant effects of ploidy of the ryegrass variety and of the proportion of ryegrass in the initial seed mixture on the botanical composition of the swards. Nevertheless, all swards were dominated by tall fescue at the end of the experiment. No overyielding of the mixtures compared with that of singlespecies swards was found, but feed quality was intermediate between that of the single-species swards. Mixed swards had better drought resistance than L. perenne and higher feeding quality than F. arundinacea swards.

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“…These findings broadly support those of multiple earlier studies (Singh and Sen 2000;Singh and Kumar 2008;Pal and Kumar 2010), although the heritability of individual traits was not entirely consistent with the findings of these other studies. Several reports have suggested that trait heritability is not a constant but may vary according to the environmental conditions (Alza and Fernandez-Martinez 1997;Andalo et al 1998;Galloway 2001;Agrawal 2002;Galloway and Etterson 2007;Riginos et al 2007;Ebrahimiyan et al 2013). Thus, plant phenotypes appeared to be significantly influenced by the levels of light, nutrients, water, temperature and CO 2 , or by herbivore pressures (Bossdorf et al 2009).…”

Section: Estimation Of Heritability Within T Patulamentioning

confidence: 92%

A study of heterosis, combining ability and heritability between two male sterile lines and ten inbred lines of Tagetes patula

Zhang

et al. 2014

Euphytica

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Two male sterile lines (Ms-1, Ms-2) and ten inbred lines (K3, K4, K5, K8, K13, K15, K17, K20, K30, K33) were crossed according to Comstock and Robinson's (in: Gowen (ed.) Heterosis, 1952) North Carolina Design II to estimate heterosis, combining ability, heritability and the phenotypic correlation coefficient for 11 ornamental characteristics of Tagetes patula. Twenty cross combinations and 12 parents were evaluated for 11 ornamental characteristics, in a randomized complete block design with three replications, in trials conducted during 2011 and 2012 at Huazhong Agricultural University, Wuhan, China. The results showed that the hybrid combinations displayed higher ornamental values and showed obvious heterosis over the male-parent for most of the ornamental traits evaluated. The male sterile line Ms-1 scored highly for general combining ability (GCA) with respect to the development of F 1 offspring with a dwarf and compact plant habit, abundant double petals, and extended period between the opening and wilting of individual inflorescences. The male sterile line Ms-2 scored highly for GCA with respect to the development of F 1 offspring with a large plant form and large flower size, as well as abundant flower numbers. The specific combining ability (SCA) of cross Ms-2 9 K20 was found to be high, with progeny showing high positive heterosis over the male parent and superior mean values for all ornamental traits, thereby indicating that this cross has the potential to function as a superior cultivar within commercial breeding programmes. Both GCA effects and SCA effects were found to be important for the performance of individual hybrid combinations, and no clear relationship between GCA and SCA was found for these T. patula lines. The ratio of r 2 GCA =r 2 SCA for individual characteristics revealed that the relative importance of GCA and SCA to progeny quality varied for different traits. Estimates of heritability showed that many of the quantitative ornamental traits of T. patula were highly heritable, and the traits of diameter of center disk and number of ray florets should readily be improved by selection. By contrast, environmental factors influenced markedly on the traits of plant height, crown size, number of days between opening and wilting of inflorescences and the maximum number of flowers present each day. Phenotypic correlation coefficient analysis showed that the various vegetative growth characteristics were closely related to one another and, more interestingly, significant phenotypic correlations were found between the growth of the vegetative and reproductive structures of T. patula.

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Genotypic variation and selection of traits related to forage yield in tall fescue under irrigated and drought stress environments

Cited by 39 publications

References 39 publications

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

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

Performance and quality of tall fescue (Festuca arundinacea Schreb.) and perennial ryegrass (Lolium perenne L.) and mixtures of both species grown with or without white clover (Trifolium repens L.) under cutting management

A study of heterosis, combining ability and heritability between two male sterile lines and ten inbred lines of Tagetes patula

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