Evaluation of Water Yam (<i>Dioscorea alata</i> L.) Germplasm for Reaction to Yam Anthracnose and Virus Diseases and their Effect on Yield

Egesi, Chiedozie; Odu, B. O.; Ogunyemi, S.; Asiedu, Robert; Hughes, J.

doi:10.1111/j.1439-0434.2007.01273.x

Cited by 19 publications

(19 citation statements)

References 18 publications

(24 reference statements)

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“…Research at IITA and other institutions has resulted in the identification of host plant resistance to some of the major pests of yams-nematodes in D. dumetorum (Mohandas et al 1996;Kwoseh 2000;Kwoseh et al 2007), viruses in D. rotundata (Mignouna et al 2001b;Odu et al 2004aOdu et al , b, 2006a and anthracnose in D. alata (Mignouna et al 2001a;Abang et al 2003;Malapa et al 2005;Onyeka et al 2006, Egesi et al 2007). The genetic basis of the resistance to a major Nigerian strain of Yam Mosaic Virus (YMV), genus Potyvirus, was investigated in D. rotundata (Mignouna et al 2001a).…”

Section: Genetic Improvementmentioning

confidence: 96%

Crops that feed the World 1. Yams

Asiedu¹,

Sartie²

2010

Food Sec.

190

115

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Yam (Dioscorea sp.) is a major source of food for millions of people in tropical and sub-tropical regions, especially in West and Central Africa where at least 60 million people depend on it. It is also a major source of income and an integral part of socio-cultural life. In addition to their food uses, some Dioscorea species are exploited for pharmaceutical products. Yam cultivation is undergoing intensification in many production zones leading to challenges in the management of soil fertility and structure, increasing pressure of diseases and pests (including weeds), and requirements for new varieties better suited to the changing biophysical and socio-economic circumstances. Greater attention also needs to be paid to raising labor productivity and improving access of producers to affordable and higher quality planting materials. These challenges, and the opportunities associated with the biology of the crop, need to be addressed more systematically and earnestly through collaborative research and development, and effective dissemination of the results to relevant stakeholders. The increasing capacity for, and international collaboration in, research and development on yam augur well for the future of the crop and the millions of people who depend on it.

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Section: Genetic Improvementmentioning

confidence: 96%

Crops that feed the World 1. Yams

Asiedu¹,

Sartie²

2010

Food Sec.

190

115

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“…Yams (Dioscorea) are a vital component of the agricultural sector of West Africa, both in terms of food, social, and cultural values [1]. In these regions, D. alata and D. rotundata are cultivated in a range of soils, from degraded smallholdings through low fertile savannas to newly cleared forest sites, which have a high degree of fertility.…”

Section: Introductionmentioning

confidence: 99%

Growth and Nutrient Use Efficiencies of Yams (Dioscoreaspp.) Grown in Two Contrasting Soils of West Africa

Diby

Tie

Girardin³

et al. 2011

International Journal of Agronomy

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Fertilization is an important management strategy of yams (Dioscoreaspp.) especially when grown in degraded soils. A field study evaluated the leaf numbers, leaf area indices, crop growth, yields, and nitrogen (N) and potassium (K) use efficiencies ofD. alataandD. rotundatain Côte d'Ivoire when grown in two contrasting soils with and without fertilizer.D. alatahad a lower number of leaves per vine, although leaf area indices were higher, and the leaves were retained for a longer period than inD. rotundata. In all situations, the yields ofD. alatawere significantly higher, and fertilizers promoted growth of shoots, roots, tubers, and, thus, final yields especially in the low fertile savanna soil. The beneficial impact of fertilizer on yields was significantly lower in the fertile forest soils. The nutrient use agronomic efficiencies indicated the impact of both N and K in promoting yields especially under nonfertilized conditions.

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“…Yam (Dioscorea species) is a tuber crop widely cultivated in West Africa and many parts of the world with humid and sub-humid climates (Onwueme and Charles, 1994;Suja et al, 2003;Egesi et al, 2007). In Nigeria, it is a staple food and the most important tuber crop cultivated in terms of land area.…”

Section: Introductionmentioning

confidence: 98%

Evaluation of White yam (Dioscorea rotundata) genotypes for arbuscular mycorrhizal colonization, leaf nutrient concentrations and tuber yield under NPK fertilizer application

Dare

Fagbola

Abaidoo

et al. 2014

Journal of Plant Nutrition

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2 Yield decline in yam may not only be due to soil nutrient depletion but also to the activity of soil microflora. Arbuscular mycorrhizal (AM) symbiosis helps in plant nutrition but may be affected by the application of fertilizer. The effects of nitrogen (N), phosphorus (P), and potassium (K) fertilizer rates on the AM colonization, leaf nutrient concentrations, and tuber yields of eleven genotypes of Dioscorea rotundata were investigated at Ibadan, Nigeria. The soil was ferric luvisol. Eleven genotypes were selected from the previously conducted screening of 75 genotypes of D. rotundata for fertilizer response. Four application rates: 0, 200, 400, and 600 kg ha −1 of NPK 15-15-15 were applied in a split plot design with four replications. Fertilizer rate was the main plot and variety was the sub plot. Percentage AM colonization was significantly reduced at 600 kg ha −1 but not at lower rates when compared to zero rate and it was negatively correlated with leaf N, P, and zinc (Zn) concentrations. Leaf N concentrations were significantly increased at 200 kg ha −1 in five genotypes and at 600 kg ha −1 in two genotypes compared to zero application. Leaf P and K concentrations were decreased with the application of fertilizer in most of the genotypes. The NPK fertilizer of 15-15-15 at the rate of 200-400 kg ha −1 gave yield response in eight genotypes of D. rotundata, with minimal or no effect on their AM colonization when compared to zero application. Long term study on the effect of fertilizer application on AM symbiosis in yam is recommended. 658 Downloaded by [McMaster University] at 12:33 05 February 2015 Fertilizer Effect on Yam Yield and AM Colonization 659

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Evaluation of Water Yam (Dioscorea alata L.) Germplasm for Reaction to Yam Anthracnose and Virus Diseases and their Effect on Yield

Cited by 19 publications

References 18 publications

Crops that feed the World 1. Yams

Crops that feed the World 1. Yams

Growth and Nutrient Use Efficiencies of Yams (Dioscoreaspp.) Grown in Two Contrasting Soils of West Africa

Evaluation of White yam (Dioscorea rotundata) genotypes for arbuscular mycorrhizal colonization, leaf nutrient concentrations and tuber yield under NPK fertilizer application

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