Genética de manihot: I. hereditariedade da forma da folha e da coloração da película externa das raizes em Manihot Utilissima pohl

Graner, Edgard

doi:10.1590/s0006-87051942000100002

Cited by 16 publications

(4 citation statements)

References 2 publications

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“…The cultivars were clearly discriminated by the numbers of lobes leaf when they are compared to their region of origin. According to Graner [43] and Nweke et al [12], the size or shape of these lobes depends on genotype and agro ecological areas.…”

Section: Discussionmentioning

confidence: 99%

Agro-Morphological Characterization of Cassava (<i>Manihot esculenta</i> Crantz) Cultivars from Chad

Djirabaye¹,

Sarr²,

Naitormbaide³

et al. 2016

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Cassava is a considerable source of food and income for the rural community of the south of Chad. Despite the importance of the diversity of cultivars in situ, their morphological traits and agronomic performance are under investigated. The aim of this study is to characterize and analyze the variability structure of the cassava's germplasm. Fifty nine cultivars collected from five main cassava growing regions, were evaluated by forty five agro-morphological descriptors in a Fisher design replicated three times. Data were collected at three, six, nine and twelve months after planting. High phenotypic variability was shown within the collection for the color of apical leaf, vein leaf, petiole, roots and pulp. The same case was observed for the root peduncle, the shape of the central leaflet and the root, the cortex root thickness and the texture of root epidermis. Significant to highly significant differences were observed for all the quantitative traits. High variability were shown for the size of the leaf lobe, petiole length, plant height, root number and length, harvest index, aboveground biomass and fresh root weight. Positive correlations were found between the leaflet and leaf lobe number. Fresh root weight was also positively correlated to the root number, length and diameter. Principal component analysis (PCA) on quantitative variable revealed four groups with two * Corresponding author. D. Nadjiam et al. 480of them containing performant cultivars: Group II with small root, high potential yield but less leaflet and leaf lobe and group III characterized by some cultivars with high productivity, more leaflet and leaf lobe, more and bigger roots. At regional level, significant differences were shown within cultivars which were discriminated in relation to their origin region by the number of the leaf lobes. The better cultivars and the interesting traits could be used to improve cassava production in Chad.

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Section: Discussionmentioning

confidence: 99%

Agro-Morphological Characterization of Cassava (<i>Manihot esculenta</i> Crantz) Cultivars from Chad

Djirabaye¹,

Sarr²,

Naitormbaide³

et al. 2016

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“…The genetic control of these traits, while not of great agronomic importance, can be used in linking studies among certain traits, in the characterization of the genome and in the distinction of crosses and self-pollinations. Graner (1942) determined that narrow-lobed leaves are a dominant trait controlled by a single gene and the brown color of the root skin is dominant over the white. observed that male sterility in cassava is a recessive monogenic trait.…”

Section: Trait Hereditymentioning

confidence: 99%

Cassava Breeding

Fukuda¹,

Silva²,

Iglesias³

2002

CBAB

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The main factors concerned with cassava breeding are described, such as origin and domestication, botanic classification and relationship with other species, reproduction mode and floral biology, factors that influence flowering, factors that affect hybridization and seed production, genetics and cytogenetics, qualitative trait heredity, selection criteria for yield, hybridization techniques, general and specific breeding objectives, breeding methods, diffusion of new varieties, current state of breeding, main results and impacts, the future of breeding and cultivars recommended in Brazil. The main results obtained at the national and international level in the areas of germplasm and cassava genetic improvement are presented. A list is included with the description of the cultivars for the Northern, Northeastern, Southeastern, Central-Western and Southern regions of Brazil.

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“…Understanding genetic markers as an essential breeding tool has given us information about the extent of natural variation and how it is passed along. Early cassava markers included morphological markers ( Graner, 1942 ; Hershey and Ocampo, 1989 ), which were then followed by biochemical markers such as isozymes ( Hussain and Hayakawa, 1987 ; Campo et al., 1992 ; Lefevre and Charrier, 1993a , 1993b ). These markers are constrained by the environment and the interaction between genotype and environment, which may make it difficult to accurately detect duplicates in genotypes ( Collard et al., 2005 ).…”

Section: Introductionmentioning

confidence: 99%

Determination of genomic regions associated with early storage root formation and bulking in cassava

Abah,

Mbe,

Dzidzienyo

et al. 2024

Front. Plant Sci.

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Early cassava storage root formation and bulking is a medium of escape that farmers and processors tend to adopt in cases of abiotic and biotic stresses like drought, flood, and destruction by domestic animals. In this study, 220 cassava genotypes from the International Institute of Tropical Agriculture (IITA), National Root Crops Research Institute (NRCRI), International Center for Tropical Agriculture (CIAT), local farmers (from farmer’s field), and NextGen project were evaluated in three locations (Umudike, Benue, and Ikenne). The trials were laid out using a split plot in a randomized incomplete block design (alpha lattice) with two replications in 2 years. The storage roots for each plant genotype were sampled or harvested at 3, 6, 9, and 12 month after planting (MAP). All data collected were analyzed using the R-statistical package. The result showed moderate to high heritability among the traits, and there were significant differences (p< 0.05) among the performances of the genotypes. The genome-wide association mapping using the BLINK model detected 45 single-nucleotide polymorphism (SNP) markers significantly associated with the four early storage root bulking and formation traits on Chromosomes 1, 2, 3, 4, 5, 6, 8, 9, 10, 13, 14, 17, and 18. A total of 199 putative candidate genes were found to be directly linked to early storage root bulking and formation. The functions of these candidate genes were further characterized to regulate i) phytohormone biosynthesis, ii) cellular growth and development, and iii) biosynthesis of secondary metabolites for accumulation of starch and defense. Genome-wide association study (GWAS) also revealed the presence of four pleiotropic SNPs, which control starch content, dry matter content, dry yield, and bulking and formation index. The information on the GWAS could be used to develop improved cassava cultivars by breeders. Five genotypes (W940006, NR090146, TMS982123, TMS13F1060P0014, and NR010161) were selected as the best early storage root bulking and formation genotypes across the plant age. These selected cultivars should be used as sources of early storage root bulking and formation in future breeding programs.

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Genética de manihot: I. hereditariedade da forma da folha e da coloração da película externa das raizes em Manihot Utilissima pohl

Cited by 16 publications

References 2 publications

Agro-Morphological Characterization of Cassava (<i>Manihot esculenta</i> Crantz) Cultivars from Chad

Agro-Morphological Characterization of Cassava (<i>Manihot esculenta</i> Crantz) Cultivars from Chad

Cassava Breeding

Determination of genomic regions associated with early storage root formation and bulking in cassava

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Genética de manihot: I. hereditariedade da forma da folha e da coloração da película externa das raizes em Manihot Utilissima pohl

Cited by 16 publications

References 2 publications

Agro-Morphological Characterization of Cassava (&lt;i&gt;Manihot esculenta&lt;/i&gt; Crantz) Cultivars from Chad

Agro-Morphological Characterization of Cassava (&lt;i&gt;Manihot esculenta&lt;/i&gt; Crantz) Cultivars from Chad

Cassava Breeding

Determination of genomic regions associated with early storage root formation and bulking in cassava

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Product

Resources

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Agro-Morphological Characterization of Cassava (<i>Manihot esculenta</i> Crantz) Cultivars from Chad

Agro-Morphological Characterization of Cassava (<i>Manihot esculenta</i> Crantz) Cultivars from Chad