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Volume 10
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10.3390/agriculture10110560
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Review

Floral Biology and Pollination Efficiency in Yam (Dioscorea spp.)

by
Jean M. Mondo
1,2,3,
Paterne A. Agre
1,*,
Alex Edemodu
1,
Patrick Adebola
4,
Robert Asiedu
1,
Malachy O. Akoroda
5 and
Asrat Asfaw
1
1
International Institute of Tropical Agriculture (IITA), Ibadan 5320, Nigeria
2
Institute of Life and Earth Sciences, Pan African University, University of Ibadan, Ibadan 200284, Nigeria
3
Department of Crop Production, Université Evangélique en Afrique (UEA), Bukavu 3323, Congo
4
International Institute of Tropical Agriculture (IITA), Abuja 901101, Nigeria
5
Department of Agronomy, University of Ibadan, Ibadan 200284, Nigeria
*
Author to whom correspondence should be addressed.
Agriculture 2020, 10(11), 560; https://doi.org/10.3390/agriculture10110560
Submission received: 21 October 2020 / Revised: 12 November 2020 / Accepted: 12 November 2020 / Published: 20 November 2020
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Abstract

Yam (Dioscorea spp.) is a monocotyledonous herbaceous vine cultivated for its starchy underground or aerial tubers in the tropics and subtropics. It is an allogamous and polyploid species that reproduces by both sexual and asexual mechanisms. However, many of the landrace cultivars, including most of the popular varieties, reproduce exclusively by vegetative propagation (planting the tubers). These varieties are either sterile or produce sparse and irregular flowering with high flower abortion rate, low fruit and seed set. Production of crossbreed seeds for genetic improvement and for maintaining genetic diversity in yams is, therefore, mainly achieved through natural or managed pollination. Flowering in yam is mostly dioecious and, in some instances, monoecious. Flowering asynchrony, sticky nature of the pollen grains, and cross incompatibility are among the challenges in making genetic progress in yam breeding. There are many limitations in basic and applied knowledge of yam flower biology and pollination. This paper, therefore, reviews the flowering biology, pollination, and methods of improving pollination efficiency in yam breeding programs.
Keywords: profuse flowering; cross incompatibility breakage; pollen viability and storage; West Africa profuse flowering; cross incompatibility breakage; pollen viability and storage; West Africa

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MDPI and ACS Style

Mondo, J.M.; Agre, P.A.; Edemodu, A.; Adebola, P.; Asiedu, R.; Akoroda, M.O.; Asfaw, A. Floral Biology and Pollination Efficiency in Yam (Dioscorea spp.). Agriculture 2020, 10, 560. https://doi.org/10.3390/agriculture10110560

AMA Style

Mondo JM, Agre PA, Edemodu A, Adebola P, Asiedu R, Akoroda MO, Asfaw A. Floral Biology and Pollination Efficiency in Yam (Dioscorea spp.). Agriculture. 2020; 10(11):560. https://doi.org/10.3390/agriculture10110560

Chicago/Turabian Style

Mondo, Jean M., Paterne A. Agre, Alex Edemodu, Patrick Adebola, Robert Asiedu, Malachy O. Akoroda, and Asrat Asfaw. 2020. "Floral Biology and Pollination Efficiency in Yam (Dioscorea spp.)" Agriculture 10, no. 11: 560. https://doi.org/10.3390/agriculture10110560

APA Style

Mondo, J. M., Agre, P. A., Edemodu, A., Adebola, P., Asiedu, R., Akoroda, M. O., & Asfaw, A. (2020). Floral Biology and Pollination Efficiency in Yam (Dioscorea spp.). Agriculture, 10(11), 560. https://doi.org/10.3390/agriculture10110560

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