The Experts below are selected from a list of 300 Experts worldwide ranked by ideXlab platform
René Gislum - One of the best experts on this subject based on the ideXlab platform.
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Path and correlation analysis of perennial ryegrass (Lolium perenne L.) Seed Yield components
Journal of Agronomy and Crop Science, 2017Co-Authors: S. Abel, René Gislum, Birte BoeltAbstract:Maximum perennial ryegrass Seed production potential is substantially greater than harvested Yields with harvested Yields representing only 20% of calculated potential. Similar to wheat, maize and other agriculturally important crops, Seed Yield is highly dependent on a number of interacting Seed Yield components. This research was performed to apply and describe path analysis of perennial ryegrass Seed Yield components in relation to harvested Seed Yields. Utilising extensive Yield components which included subdividing reproductive inflorescences into five size categories, path analysis was undertaken assuming a unidirectional causal-admissible relationship between Seed Yield components and harvested Seed Yield in six commercial Seed production fields. Both spikelets per inflorescence and florets per spikelet had a significant (p
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Path and ridge regression analysis of Seed Yield and Seed Yield components of Russian wildrye (Psathyrostachys juncea Nevski) under field conditions.
PloS one, 2011Co-Authors: Quanzhen Wang, Tiejun Zhang, Jian Cui, Xianguo Wang, He Zhou, Jianguo Han, René GislumAbstract:The correlations among Seed Yield components, and their direct and indirect effects on the Seed Yield (Z) of Russina wildrye (Psathyrostachys juncea Nevski) were investigated. The Seed Yield components: fertile tillers m-2 (Y1), spikelets per fertile tillers (Y2), florets per spikelet- (Y3), Seed numbers per spikelet (Y4) and Seed weight (Y5) were counted and the Z were determined in field experiments from 2003 to 2006 via big sample size. Y1 was the most important Seed Yield component describing the Z and Y2 was the least. The total direct effects of the Y1, Y3 and Y5 to the Z were positive while Y4 and Y2 were weakly negative. The total effects (directs plus indirects) of the components were positively contributed to the Z by path analyses. The Seed Yield components Y1, Y2, Y4 and Y5 were significantly (P
Birte Boelt - One of the best experts on this subject based on the ideXlab platform.
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Path and correlation analysis of perennial ryegrass (Lolium perenne L.) Seed Yield components
Journal of Agronomy and Crop Science, 2017Co-Authors: S. Abel, René Gislum, Birte BoeltAbstract:Maximum perennial ryegrass Seed production potential is substantially greater than harvested Yields with harvested Yields representing only 20% of calculated potential. Similar to wheat, maize and other agriculturally important crops, Seed Yield is highly dependent on a number of interacting Seed Yield components. This research was performed to apply and describe path analysis of perennial ryegrass Seed Yield components in relation to harvested Seed Yields. Utilising extensive Yield components which included subdividing reproductive inflorescences into five size categories, path analysis was undertaken assuming a unidirectional causal-admissible relationship between Seed Yield components and harvested Seed Yield in six commercial Seed production fields. Both spikelets per inflorescence and florets per spikelet had a significant (p
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Breeding for Grass Seed Yield
Fodder Crops and Amenity Grasses, 2010Co-Authors: Birte Boelt, Bruno StuderAbstract:Seed Yield is a trait of major interest for forage and turf grass species and has received increasing attention since Seed multiplication is economically relevant for novel grass cultivars to compete commercially.
D. H. Hides - One of the best experts on this subject based on the ideXlab platform.
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Spring defoliation of white clover Seed crops. 2. Potential harvestable Seed Yield and Seed Yield components of contrasting white clover cultivars
Grass and Forage Science, 1993Co-Authors: Athole H. Marshall, P. A. Hollington, D. H. HidesAbstract:The effects of different spring defoliation managements on potential harvestable Seed Yield and Seed Yield components of three contrasting white clover cultivars were assessed. The small-leaved cv. S184 produced more but smaller inflorescences than the large-leaved cv. Olwen and Menna, a medium-leaved cultivar. Cultivar Olwen, however, produced more ripe and brown (nearly ripe) inflorescences with more florets, Seeds per floret and a higher Seed Yield per ten inflorescences than the other cultivars. Potential harvestable Seed Yield and individual Seed Yield components were only influenced by defoliation after bud emergence, as defoliation before bud emergence had no effect on Seed Yield components. Defoliation after bud emergence had a similar effect on all cultivars: the number of ripe inflorescences was unaffected by defoliation but the number of brown and therefore harvestable (ripe + brown) inflorescences was highest following defoliation three weeks after bud emergence. Florets per inflorescence, Seed per floret, 1000 Seed weight, Seed Yield per ten inflorescences and potential harvestable Seed Yield were not influenced by defoliation after bud emergence. Season had a significant effect on Seed Yield components and influenced the effect of defoliation treatments, emphasizing the importance of climate in white clover Seed production. The results are discussed in relation to the spring defoliation of white clover Seed crops, harvesting techniques and the provision of guidelines for optimizing Seed Yield.
Roland Kolliker - One of the best experts on this subject based on the ideXlab platform.
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qtl analysis of Seed Yield components in red clover trifolium pratense l
Theoretical and Applied Genetics, 2006Co-Authors: Doris Herrmann, Beat Boller, Bruno Studer, Franco Widmer, Roland KollikerAbstract:Cultivars of red clover (Trifolium pratense L.), an important forage crop in temperate regions, are often characterised by an unsatisfactory level of Seed Yield, leading to high production costs. This complex trait is influenced by many components and negatively correlated with other important traits, such as forage Yield or persistence. Therefore, Seed Yield has proven to be difficult to improve. Thus, the objectives of this study were to assess association among Seed Yield components and to provide the basis for identifying molecular markers linked to QTLs for Seed Yield components to assist breeding for improved red clover cultivars. A total of 42 SSR and 216 AFLP loci were used to construct a molecular linkage map with a total map length of 444.2 cM and an average distance between loci of 1.7 cM. A total of 38 QTLs were identified for eight Seed Yield components. The traits Seed number per plant, Seed Yield per head, Seed number per head, head number per plant and percent Seed set were highly correlated with Seed Yield per plant, and QTLs for several of these traits were often detected in the same genome region. Head number per plant may present a particularly useful character for the improvement of Seed Yield since it can easily be determined before Seed maturity. In addition, two genome regions containing four or five QTLs for different Seed Yield components, respectively, were identified representing candidate regions for further characterisation of QTLs. This study revealed several key components which may facilitate further improvement of Seed Yield. The QTLs identified represent an important first step towards marker-assisted breeding in red clover.
P. Martiniello - One of the best experts on this subject based on the ideXlab platform.
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Analysis of Seed Yield components in four Mediterranean annual clovers
Field Crops Research, 1998Co-Authors: A. Iannucci, P. MartinielloAbstract:Abstract Annual leguminous forage crops are well adapted to hay production under the climatic conditions of Mediterranean environments, but their Seed Yield is often reduced by high temperatures and water stress that occur during the reproductive period. Field experiments using four forage legumes, berseem (Trifolium alexandrinum L.), crimson clover (Trifolium incarnatum L.), Persian clover (Trifolium resupinatum L.) and squarrosum clover (Trifolium squarrosum L.) were conducted in Foggia (southern Italy) during 1993 and 1994 under irrigated and non-irrigated conditions, with the aim to evaluate: (i) the effects of water deficit on traits which influence Seed Yield and (ii) the associations among Seed Yield components by means of path-coefficient analysis. Seed Yield varied among species: Persian and berseem clovers showed the highest and lowest values (74.0 and 27.0 g m−2, respectively). Drought stress, in all species, negatively influenced the dry matter proportion partitioned to reproductive growth and strongly reduced Seed Yield (about 50% on average) and Seed Yield components in all species. Negative associations between the principal Yield components were found in all species except berseem, suggesting the existence of compensatory relationships. Path-coefficient analysis revealed that for crimson and Persian clovers, the early flowering species, a Seed Yield increase cannot be achieved without a suitable tiller density. For squarrosum clover, the head fertility was the most important component in determining Seed Yield; whereas for berseem, Seeds per head, heads per tiller and Seed weight, all had positive direct effects on Seed Yield. As the Yield components that most affected Seed Yield were species-specific, general conclusions cannot be drawn. Among the species examined, berseem and squarrosum clover, characterized by a longer vegetative cycle, were more damaged by water stress when it occurred during Seed formation and filling.
