Conservation Breeding of Elite Cultivars

Tokatlidis, Ioannis S.

doi:10.2135/cropsci2015.04.0220

Cited by 12 publications

(22 citation statements)

References 88 publications

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“…During progeny evaluations, the bulk strategy is adopted within families. Under this condition, the cultivars obtained are actually a mixture of lines and not only a single pure line (Tokatlidis 2015). This corroborates the comments of Becker and Léon (1988) and reinforces that cultivars that are as stable as the heterogeneous populations can be identified.…”

Section: Resultssupporting

confidence: 85%

Stability analysis of pure lines and a multiline of soybean in different locations

Carneiro

Bruzi

Pereira

et al. 2019

Crop Breed. Appl. Biotechnol.

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To compare agronomic performance and phenotypic stability among individual soybean lines and a multiline, eight cultivars and a mixture of them were evaluated in six environments in the 2014/2015 and 2015/2016 crop seasons. At maturity, grain yield (bg ha-1), lodging score, plant height (cm), and first pod height (cm) were evaluated. In the 2015/2016 season, the grain oil and protein content were also evaluated. The GxE interaction was determined by the ecovalence method. The cultivar V-TOP RR had the highest yield, but it was also the highest contributor to the GxE interaction, while the multiline was one of the most stable. The average yield of the multiline did not differ from the average yield of the lines, i.e., the multiline was stable and high yielding. For the other traits, there were no differences between the averages of lines and the multiline by the confidence interval. The mixture of lines is an efficient strategy to increase phenotypic stability in soybean.

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Section: Resultssupporting

confidence: 85%

Stability analysis of pure lines and a multiline of soybean in different locations

Carneiro

Bruzi

Pereira

et al. 2019

Crop Breed. Appl. Biotechnol.

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“…The CV values under the ultra-low density for seed yield plant -1 revealed a moderate spatial heterogeneity under deficit irrigation for all the genotypes tested. This is desirable because phenotypic screening and breeding for high yield is expected to ultimately select for potentially tolerant to water stress genotypes (Tokatlidis, 2015).…”

Section: Resultsmentioning

confidence: 99%

“…The existence of genetic heterogeneity in Greek genotypes is offered for plant selection with methods of classical improvement and main criterion plant yield (Papadopoulos et al, 2007). An intracultivar single-plant selection under ultra-low density has been extensively used to exclude plant-to-plant interference for resources as nil-competition boosts phenotypic expression and erases the masking effects induced by the negative relationship between yielding and competitive ability (Tokatlidis, 2015). This is making selection of desirable genotypes within a narrow gene pool and divergent environments applicable (Vlahostergios et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

Single-Plant Selection at Ultra-Low Density of First Generation Lines of Three Bean Cultivars Under Water Stress

Papathanasiou¹,

Papadopoulou²,

Mylonas³

et al. 2019

AgricultForest

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Nil-competition (ultra-low plant density) has been asserted to highlight individual genotypes of high yielding potential. This was tested preliminary on three determinate type bean varieties (Phaseolus vulgaris L.), two genetically non-uniform and with unstable yields Greek cultivars, Iro and Pirgetos and a "Great northern" type imported variety. Single-plant selection under ultra-low density (interplant distance of 100 cm) was performed in a honeycomb design experiment established during 2017 in the main farm of the University of Western Macedonia in Florina. Eighteen high yielding plants were selected and seed of each constituted a separate first generation line. In 2018, progeny evaluation was conducted in two R21 honeycomb design trials under normal and deficit irrigation treatments respectively. Compared to the original variety Iro, four of the high yielding progeny lines had higher yield plant-1 (by 20 to 39%) under water deficit with two being significantly different, where for the variety Pyrgetos only one first generation sister line significantly outperformed the original cultivar by 28%. Water stress affected significantly total chlorophyll content measured at 10 day intervals from start of flowering until physiological maturity with the best performing progeny lines showing higher chlorophyll concentrations especially during the seed filling stage. Significant differences between progeny lines and the original varieties were also shown on CO 2 assimilation rate under water deficit especially within the genotype Iro. Further research is needed so that any existing variation is beneficially exploited.

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“…Varieties grown by farmers may lose their genetic identity and healthiness in the long term [41]. Contaminating and degrading forces, such as outcrossing, volunteer plants, physical admixture, natural selection, mutation, and seed-borne diseases, are at the root of this [7].…”

Section: Mechanisms Of New Variationmentioning

confidence: 99%

Sustainable Stewardship of the Landrace Diversity

Tokatlidis

Vlachostergios

2016

Diversity

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Landraces are heterogeneous populations and their variability goes through continuous alterations because of physical, genetic, and epigenetic procedures exacerbated by the ongoing climatic changes. Appropriate stewardship of landrace diversity is pivotal to promote its longevity in a manner that is sustainable from the farming perspective. A seed multiplication procedure is presented based on the assumption that in order to improve effectiveness in resource use and increase seed productivity, landraces should comprise genotypes which minimize intra-species competition. These aforementioned genotypes should be of the "weak competitor" ideotype, which are selected so as to alleviate the interplant competition and reach as high as possible crop stand uniformity. Stand uniformity is essential to ensure the same growing conditions for each plant. Reduced intra-crop inequality and equal use of inputs by individual plants will optimize crop performance. Precisely, the "weak competitor" is most often of high yield potential due to a negative association between yielding and competitive ability. Therefore, the suggested procedure involves initial reproduction at nil-competition (widely spaced plants to preclude any plant-to-plant interference for inputs) where "off-type" and low yielding plants are omitted, followed by subsequent multiplication at dense stands. This may represent an effective cultural practice to improve also the landrace health status concerning seed-borne diseases in the absence of certification systems.

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Conservation Breeding of Elite Cultivars

Cited by 12 publications

References 88 publications

Stability analysis of pure lines and a multiline of soybean in different locations

Stability analysis of pure lines and a multiline of soybean in different locations

Single-Plant Selection at Ultra-Low Density of First Generation Lines of Three Bean Cultivars Under Water Stress

Sustainable Stewardship of the Landrace Diversity

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