Genetic divergence among interspecific Paspalum hybrids based on seed production traits

Lopes, Rodrigo Ramos; Franke, Lucia Brandão; Souza, Cléber Henrique Lopes de; Bertoncelli, Patrícia; Graminho, Larissa Arnhold

doi:10.1590/1413-70542017414006217

Cited by 3 publications

(1 citation statement)

References 13 publications

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“…A similar performance was observed for U. humidicola using the selection index with 70% of the weight for agronomical traits during the wet season (Figueiredo et al 2012). These indices (7 and 9) are likely overestimating the gains because of the higher genetic variability observed for agronomical traits in relation to nutritional traits in forage, as observed for Paspalum (Pereira et al 2012, Lopes et al 2017, Arachis (Menezes et al 2012), Panicum maximum (Martuscello et al 2015), U. humidicola (Figueiredo et al 2012), and Urochloa spp. (Matias et al 2018).…”

Section: Selecting Sexual Genitorssupporting

confidence: 55%

Using additive indices and principal components to select sexual genitors and hybrids of Urochloa decumbens

Matias

Valle

Gouveia

et al. 2020

Crop Breed. Appl. Biotechnol.

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The selection of sexual genitors in Urochloa decumbens breeding is dependent upon the performance of their progeny for several traits simultaneously. Thus, our objectives were to (i) compare the efficiency of indices to select genitors of U. decumbens, (ii) evaluate the genetic gains obtained through selection intensities, and (iii) evaluate the multivariate pattern of progenies through principal components analysis (PCA). For this purpose, 1415 hybrids from 75 progenies of full siblings were evaluated at Embrapa Beef Cattle (Brazil) using seven cuts for dry matter production, regrowth, protein, fiber, lignin, and percentage digestibility. Statistical analyses were performed using mixed models and PCA. The direct selection for dry matter production provided a 37.51% genetic gain. Agronomic traits using indices provided greater gains. Genitors selected using PCA Biplot were similar to selections using indices. Indices and PCA were proven to be an excellent tool to select multi-traits in U. decumbens.

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Section: Selecting Sexual Genitorssupporting

confidence: 55%

Using additive indices and principal components to select sexual genitors and hybrids of Urochloa decumbens

Matias

Valle

Gouveia

et al. 2020

Crop Breed. Appl. Biotechnol.

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Early flowering, genetic dissimilarity and clustering of lettuce cultivars with thermoinhibition tolerant seeds

et al. 2022

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High temperatures interfere with lettuce cropping. Thermoinhibition of seed germination and early flowering cause important losses for farmers. The objectives of this work were to evaluate the tolerance to early flowering, to verify the genetic dissimilarity and to select lettuce cultivars tolerant to seed thermoinhibition. 18 cultivars were evaluated. The number of days until the first anthesis was verified for early flowering. Regarding seed thermoinhibition, the first and final germination counting and germination speed index were evaluated, using temperatures of 20, 25, 30 and 35ºC. The analyses were performed immediately after harvest and after six months under storage. The genetic dissimilarity was obtained using the Tocher Graph optimization and hierarchical UPGMA methods. Regression models were adjusted, and curves’ clustering was performed by testing the identity of the models. Early flowering was observed in cultivars Floresta, Colorado, Grand Rapids, and Everglades. Cultivars showed genetic variability and are dissimilar regarding tolerance to thermoinhibition. By clustering the regression equations, it was possible to select thermoinhibition tolerant cultivars.

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Genetic dissimilarity for thermoinhibition in seeds of lettuce lines after defoliation

Catão¹,

Maciel²,

Gomes³

et al. 2022

Acta Sci. Agron.

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Removal of lettuce basal leaves is a technique used by the seed industry; however, the effects on seed production and physiological potential are unknown. Genetic dissimilarity is fundamental in the identification of individuals in terms of traits of interest, although it is rarely considered in relation to seeds that are tolerant to thermoinhibition. The aim of this study was to ascertain the relationship between defoliation of lettuce plants and seed yield/physiological quality, as well as the genetic dissimilarity among genotypes with regard to seed thermoinhibition. We used 35 lines of biofortified lettuce, the cultivars Uberlândia 10000, Belíssima, UFU MC BIOFORT1, and Everglades (tolerant to thermoinhibition), and Grand Rapids and Verônica (susceptible to thermoinhibition). The seed yield and physiological quality of the genotypes with and without defoliation were evaluated, artificially aged, and germinated at four temperatures in a factorial arrangement. The genetic dissimilarity was estimated by Tocher graphing and the UPGMA clustering method, based on the Mahalanobis generalized distance (D 2 ii). Four UFU genotypes and Grand Rapids had high seed yields. With removal of basal leaves, there was higher seed yield per plant and there was an effect on their physiological quality. The genotypes exhibited genetic variability for thermoinhibition, with UFU-86#2#1#1 and Everglades showing similar performance.

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Genetic divergence among interspecific Paspalum hybrids based on seed production traits

Cited by 3 publications

References 13 publications

Using additive indices and principal components to select sexual genitors and hybrids of Urochloa decumbens

Using additive indices and principal components to select sexual genitors and hybrids of Urochloa decumbens

Early flowering, genetic dissimilarity and clustering of lettuce cultivars with thermoinhibition tolerant seeds

Genetic dissimilarity for thermoinhibition in seeds of lettuce lines after defoliation

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