Effect of stake sizes on some growth indices and yield of three cassava cultivars (<i>Manihot esculenta</i>)

Eke-Okoro, O. N.; Okereke, O. U.; Okeke, J. E.

doi:10.1017/s0021859601001320

Cited by 9 publications

(7 citation statements)

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“…The size and quality of stem are of fundamental importance for high yields (Eke-Okoro et al, 2001). Differences in weight of stem cuttings result in differences in food reserve (Okeke, 1998), and it is on this that the initial growth of the plant depends implying basically that stem weight or starch are associated to the establishment phase of cassava in the field.…”

Section: Key Early-growth Phase Phenotyping Methodology For Molecularmentioning

confidence: 99%

Phenotypic approaches to drought in cassava: review

Okogbenin¹,

Setter²,

Ferguson³

et al. 2013

Front. Physiol.

191

181

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Cassava is an important crop in Africa, Asia, Latin America, and the Caribbean. Cassava can be produced adequately in drought conditions making it the ideal food security crop in marginal environments. Although cassava can tolerate drought stress, it can be genetically improved to enhance productivity in such environments. Drought adaptation studies in over three decades in cassava have identified relevant mechanisms which have been explored in conventional breeding. Drought is a quantitative trait and its multigenic nature makes it very challenging to effectively manipulate and combine genes in breeding for rapid genetic gain and selection process. Cassava has a long growth cycle of 12–18 months which invariably contributes to a long breeding scheme for the crop. Modern breeding using advances in genomics and improved genotyping, is facilitating the dissection and genetic analysis of complex traits including drought tolerance, thus helping to better elucidate and understand the genetic basis of such traits. A beneficial goal of new innovative breeding strategies is to shorten the breeding cycle using minimized, efficient or fast phenotyping protocols. While high throughput genotyping have been achieved, this is rarely the case for phenotyping for drought adaptation. Some of the storage root phenotyping in cassava are often done very late in the evaluation cycle making selection process very slow. This paper highlights some modified traits suitable for early-growth phase phenotyping that may be used to reduce drought phenotyping cycle in cassava. Such modified traits can significantly complement the high throughput genotyping procedures to fast track breeding of improved drought tolerant varieties. The need for metabolite profiling, improved phenomics to take advantage of next generation sequencing technologies and high throughput phenotyping are basic steps for future direction to improve genetic gain and maximize speed for drought tolerance breeding.

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Section: Key Early-growth Phase Phenotyping Methodology For Molecularmentioning

confidence: 99%

Phenotypic approaches to drought in cassava: review

Okogbenin¹,

Setter²,

Ferguson³

et al. 2013

Front. Physiol.

191

181

View full text Add to dashboard Cite

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“…where W 1 and W 2 are crop dry weight (mg) and L 1 and L 2 are leaf area (cm 2 ) at the times T 1 and T 2 (d), respectively (Eke-Okoro et al, 2001). The harvest index (HI) (Kawano, 1990) was computed using the following equation:…”

Section: Data Collectionmentioning

confidence: 99%

“…upland condition in Khon Kaen Province, Thailand, indicated that the crop traits (SRGR during 300-360 DAP,LGR during 60-120 DAP, and LGR during 300-360 DAP) were the components of physiological determinants of both total crop and storage root dry weights at final harvest Lahai et al (1999). Higher values of CGR and NAR of three different cassava genotypes(TMS 30572, TMS 91934, and NR 8083) were associated with the weight of planting material or stick that produced optimum storage root yield in Nigeria (5.4° N, 7.5° E; 122 m asl)(Eke-Okoro et al, 2001). Higher values of CGR and NAR of three different cassava genotypes(TMS 30572, TMS 91934, and NR 8083) were associated with the weight of planting material or stick that produced optimum storage root yield in Nigeria (5.4° N, 7.5° E; 122 m asl)(Eke-Okoro et al, 2001).…”

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confidence: 97%

Cassava Growth Analysis of Production during the Off‐Season of Paddy Rice

et al. 2019

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Cassava (Manihot esculenta Crantz) grown in upper paddy fields after rice (Oryza sativa L.) could increase cassava yield and improve land use efficiency. The objective of this study was to evaluate growth, yield, and starch content of four cassava genotypes grown after the harvest of rice in upper paddy fields in Thailand. Four cassava genotypes—cultivars Kasetsart 50, Rayong 9, and Rayong 11—and line CMR38‐125‐77 were evaluated during the 2015–2016 and 2016–2017 growing seasons for five environments. Each experiment had a randomized complete block design with four replications. Soil characteristics were assessed prior to planting, and crop growth and development and local weather conditions were recorded during the experiments. Environment affected all traits, but genotype and genotype × environment effects were nonsignificant for starch content at 180 d after planting (DAP) and for leaf growth rate (LGR) at 120 to 180 DAP. Average storage root dry weights across five environments were 4301, 3933, 3128, and 5824 kg ha−1 for Kasetsart 50, Rayong 9, Rayong 11, and CMR38‐125‐77, respectively. CMR38‐125‐77 was the most stable genotype for storage root fresh and dry weights, and total dry weight. Physiological determinants of both storage root yield and total biomass of cassava were crop growth rate (CGR) and net assimilation rate (NAR) for 30 to 90 DAP and LGR, stem growth rate (SGR), CGR, and NAR for 120 to 180 DAP, as well as storage root growth rate (SRGR) for 90 to 180 DAP. Leaf growth rate during 120 to 180 DAP is likely to be a new criterion for supporting cassava varietal selection. This investigation showed the feasibility of growing cassava between paddy rice seasons.

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“…Eke-Okoro (2000) assessed the photosynthetic efficiency and productivity of low and high cyanide cassava genotypes and reported that high cyanide cassava genotypes had better photosynthetic efficiency and higher storage root yield than low cyanide cassava genotypes. Also, cassava genotypes with profuse branching characters have the tendency to produce higher fresh root yield than the less branching types (Eke-Okoro et al, 2001).…”

Section: Introductionmentioning

confidence: 99%

Assessment of growth and yield of some high-and low-cyanide cassava genotypes in acid ultisols of south eastern Nigeria

Okpara¹,

Mbah²,

Chukwu³

2014

Afr. J. Biotechnol.

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Thirty-eight high and low cyanide cassava genotypes were evaluated for growth and yield. The experiment was fitted in a randomized complete block design with three replications. Analysis of variance (ANOVA) revealed significant difference (P<0.05) in growth and yield parameters, indicating strong genetic variations among the genotypes. Significant (P<0.05) highest average storage root weight of 1.5 and 1.8 kg were obtained from TMS 94/0035 (high cyanide cassava genotype) and TMS 98/0505 (low cyanide cassava genotype), respectively. Correlation analyses indicated significant (P<0.05) and positive associations between number of storage roots per plant, average storage root weight and root yield in the two types of cassava genotypes tested, indicating that the parameters are good indices that can be improved upon during breeding and selection to enhance root yield. Four high cyanide cassava genotypes (TMS 99/2123, TMS 96/1642, TMS 98/0068 and TMS 94/3200﴿ were outstanding in fresh root yield performance. To improve fresh root yield in cassava, the interrelationships among the various agronomic character of the cassava genotypes demands appropriate attention. The study gives more information on the improvement of fresh storage root yield of cassava.

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Effect of stake sizes on some growth indices and yield of three cassava cultivars (Manihot esculenta)

Cited by 9 publications

References 0 publications

Phenotypic approaches to drought in cassava: review

Phenotypic approaches to drought in cassava: review

Cassava Growth Analysis of Production during the Off‐Season of Paddy Rice

Assessment of growth and yield of some high-and low-cyanide cassava genotypes in acid ultisols of south eastern Nigeria

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