Genetic parameters, path analysis and indirect selection of agronomic traits of cassava germplasm

Diniz, Rafael Parreira; Oliveira, E. J. de

doi:10.1590/0001-3765201920180387

Cited by 10 publications

(4 citation statements)

References 15 publications

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“…The relative coefficients of variation (CV r ) were lower than 1 for all the traits analyzed, indicating an unfavorable situation for direct selection of these traits under drought and early harvest. When this occurs, due to higher environmental variation among genotypes than genetic variation, indirect selection carried out by means of path analysis in target environments can be a method that allows high genetic gains to be obtained (Diniz and Oliveira 2019).…”

Section: Resultsmentioning

confidence: 99%

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Genetic parameters and path analysis for root yield of cassava under drought and early harvest

Oliveira

Borel

Pereira

et al. 2021

Crop Breed. Appl. Biotechnol.

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The objectives of this study were to estimate genetic parameters and identify traits that contribute to early yield in Manihot esculenta Crantz. Ten traits were evaluated in two experiments, one with 138 genotypes and the other with 133, using a completely randomized block design with four replications. All genotype effects were significant. The accuracy was high for the traits, except leaf retention (0.57), and reliability ranged from 0.33 to 0.75. Root weight (RW) and number of roots (NR) showed the highest selection effectiveness (CV r ), although the estimate was less than 1. Moreover, RW and NR obtained high genetic correlation (0.70). Path analysis showed that only number of roots had a significant direct effect on root weight (0.49), and no indirect effect was found. Therefore, accessions exhibited sufficient genetic variability, and indirect selection based on early evaluation of number of roots can be applied in cassava breeding for fresh root yield, increasing gain over time.

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Section: Resultsmentioning

confidence: 99%

“…For that reason, Mulualem and Ayenew (2012) suggest not using final root weight (production) as an explanatory variable in the path analysis. Diniz and Oliveira (2019) report an alternative of using starch production as an explanatory trait. They obtained R 2 above 97% and a low residual correlation value (0.14).…”

Section: Resultsmentioning

confidence: 99%

Genetic parameters and path analysis for root yield of cassava under drought and early harvest

Oliveira

Borel

Pereira

et al. 2021

Crop Breed. Appl. Biotechnol.

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“…High heritability value in a broad sense and the high genetic advance in character means that the character is under control of the influence of additive genes which indicates that selection in germplasm should lead to a rapid increase in the trait [15]. Additionally, [16] stated that fresh weight of tuber and plant height had high heritability value as 31% and 62%, respectively. Therefore, the objective of this study was to evaluate genetic variation and genetic advance of three cassava clones.…”

Section: Introductionmentioning

confidence: 99%

Genetic Variation and Genetic Advance of Three Elite Cassava (Manihot Esculenta Crantz) Clones Under Wet Dry Climate of Lampung

Setiawan

Paresta

Hadi

et al. 2022

IOP Conf. Ser.: Earth Environ. Sci.

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Waxy cassava having high amylopectin content could contribute and increase genetic background. Unfortunately, the genetic parameter information of three elite cassava clones as Waxy, UJ-5, and BW-1 is still limited. Consequently, the objective of this study was to evaluate the genetic variation and genetic advance of three cassava clones. This study was conducted on the Integrated Field Lab of Lampung from December 2019 to October 2020. Treatment was arranged by a single factor in RCBD with two replications. There were three cassava genotype clones, as Waxy, UJ-5 (originally Kasetsart), and BW-1 (originally Huay Bong-60). Genetics parameters were analyzed by using Minitab programs (Version 17). Variables observed were plant height, leaf number, attached leaf number, internode number, root number, tuber number, tuber fresh weight, tuber dry weight, stem dry weight, attached leaf dry weight, petiole dry weight, starch content, starch weight, and harvest index. The results showed that most variables had high genetic variation and heritability value except for starch content. Starch content showed a medium heritability value as 50%. Moreover, the genetic advance of starch content and weight were 14 and 18%, respectively. It could be concluded that an environmental factor influenced starch content.

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“…indicated that cassava genotypes significantly (P < 0.05) affected all the tested variables (LAI at 12 MAP, plant biomass, CMD incidence, CBB incidence, cyanide potential, starch content, length of root neck, root diameter, root length, number of marketable roots per plot, weight of marketable roots per plot and total fresh root yield [Mt ha−1 ]).Among the cassava genotypes, LAI at 12 MAP and plant biomass ranged from 2.22[21] (TMS 961708) to 7.26[20] (B1-5) and 300[20] (B1-5) to 665[22] (NR110178) kg per plant, respectively, while CMD and CBB incidence ranged from 5.0%[6] (B4-6) to 70.0% and 26.0% to 85.0%, respectively. The cassava genotype[10] (TMS 010354) exhibited the highest CMD incidence which was higher by 92.9% relative to the lowest disease incidence recorded in [20] B1-5 cassava genotype, while[4] B1-78 had the lowest CBB incidence percentage, which was lower by 69.4% relative to the highest CBB disease incidence recorded in[25] NR100486 and[26] NR100449 cassava genotypes.…”

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confidence: 99%

Assessment of yield components of some cassava (Manihot esculenta Crantz) genotypes using multivariate analysis such as path coefficients

Njoku

Mbah

2020

Open Agriculture

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Cassava, which is a tropical storage root crop, serves as a veritable source of carbohydrate for people living in Sub-Saharan Africa. It is also an important source of industrial starch, biopolymers, animal feeds and ethanol. However, the genetic improvement of the crop is impeded by dearth in information on its genetic variability. A field experiment was carried out at the National Root Crops Research Institute, Umudike (05° 29′ N; 07° 33′ E; 122 m a.s.l.), Nigeria, aimed at assessing the interrelationship between fresh root yield and thirteen quantitative yield-related characters of twenty-eight (28) newly developed cassava genotypes. The rain-fed experiment was laid out in a randomized complete block design with dual replications in 2016/2017 cropping seasons. The results indicated that the newly developed cassava genotypes [2] NR110315 followed by [20] B1-5 and [1] NR110238 exhibited (P < 0.05) highest fresh root yield among the twenty-eight genotypes tested. The fresh root yield of [2] NR110315 (18.77 Mt ha−1) was relatively higher compared with [18] NR050080, which gave the least root yield of 5.38 Mt ha−1. The correlation coefficients obtained from the associations among the variables were positive and exhibited highly significant (P ≤ 0.01) association, especially between leaf area index (LAI) and root diameter as well as with fresh root yield of cassava. Among the nine variables subjected to the path analysis, LAI, starch content, above ground dry matter (AGDM), weight of fresh marketable roots per plant and root length that contributed positively and directly to higher fresh root yield require greater attention during selection and breeding in cassava studies. The direct effect of the variables indicating their magnitudes in decreasing order showed that LAI exhibited the greatest effect followed by starch content, AGDM, weight of fresh marketable roots plant−1, root length, % cassava bacterial blight incidence and % Cassava mosaic disease incidence, which had the lowest direct effect on root yield of cassava. Cyanide potential exhibited a direct, weak and negative effect on fresh root yield. The results further suggested that cassava improvement could be achieved through these characters that have positive and highly significant magnitude effect on fresh root yield.

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Genetic parameters, path analysis and indirect selection of agronomic traits of cassava germplasm

Cited by 10 publications

References 15 publications

Genetic parameters and path analysis for root yield of cassava under drought and early harvest

Genetic parameters and path analysis for root yield of cassava under drought and early harvest

Genetic Variation and Genetic Advance of Three Elite Cassava (Manihot Esculenta Crantz) Clones Under Wet Dry Climate of Lampung

Assessment of yield components of some cassava (Manihot esculenta Crantz) genotypes using multivariate analysis such as path coefficients

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