Flowering, Pollen Grain Germination, Fruiting, Seed Germination and Seedling Development of White Yam, Dioscorea rotundata Poir

Sadik, Sidki; Okereke, O. U.

doi:10.1093/oxfordjournals.aob.a084971

Cited by 35 publications

(30 citation statements)

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“…Taking into account their small size, thrips (Larothrips dentipes, Thysanoptera, Thripidae) would have the possibility of penetrating in both staminate and pistillate flowers, thus playing a role in yam pollination as earlier reported (Pitkin, 1973;Sadik & Okereke, 1975b;Akoroda, 1981Akoroda, , 1985. Other pollinators included insects belonging to the Coleoptera, Diptera, Hemiptera and Hymenoptera.…”

Section: Discussionmentioning

confidence: 88%

Studies on the reproductive biology of white yam (Dioscorea rotundata Poir.)

et al. 1992

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Investigations were conducted on the identification and distribution of yam natural pollinators, flowering pattern and hybridization of white yam (Dioscorea rotundata Poir.) at the International Institute of Tropical Agriculture (IITA), Ibadan, Nigeria, in order to provide informations for producing hybrid seeds needed for yam genetic improvement.Insects belonging to the Coleoptera (48.0%), Diptera (20.4%), Hymenoptera (20.0%), Hemiptera (5.8%), and Thysanoptera (5.8%) were caught around yam plants and presumed to be pollinators: they entered open-receptive-flowers and their presence on yam plants coincided with the duration of the flowering period.Studies on the flowering pattern revealed that: (i) Male and female clones differed in their periods of flower initiation as well as the flowering duration; (ii) Seed production and conventional breeding methods are feasible if staggered planting, water and soil fertility could be managed to ensure that flowering periods of males and females nick and also extend flowering.Artificial pollinations within white yam and between white yam and yellow yam (D. cayenensis Lam) using the camel hair brush method were successful, but resulted in a relatively low fruit set (31.8% maximum). This method was more effective than natural pollination (19.2%) and can thus supplement it for the production of hybrid seeds for introducing genetic variation in yam breeding populations.

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Section: Discussionmentioning

confidence: 88%

Studies on the reproductive biology of white yam (Dioscorea rotundata Poir.)

et al. 1992

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“…Freshly collected seeds of D. composita are dormant, and this dormancy is lost with time. Embryo dormancy could be present as in other species of Dioscorea (Sadik and Okereke 1975;Yakuna et al 1981).…”

Section: Storage Durationmentioning

confidence: 91%

Effects of storage on germination ofDioscorea composita (Dioscoreaceae) seeds

Viana¹,

Felippe

1990

Econ Bot

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Effects ofstorage were tested on germination of Dioscorea composita (Dioscoreaceae) seeds. Freshly collected seeds and seeds stored at 25"C in paper bagsfrom 1 to 11 mo or for 4 and 5 yr were used in most of the experiments. Seeds were testedfor germination at 20,25,30, 35, 25-20, 25-30, and 25-35"C in white light and in darkness. Initiation ofgermination was delayed in freshly harvested seeds, and dormancy was reduced in seeds stored for about 9 mo. Viability of the seeds decreased after 4 and 5 yr ofstorage.Efeito do Armazenamento na Germinacao de Sementes de Dioscorea composita (Dioscoreaceae). Os efeitos do armazenamento foram verificados na germinaciio de sementes de Dioscorea composita. Sementes recem-coletadas e outras armazenadas, de 1 a 11 meses ou de 4 e 5 anos, em sacos de papel at 25°C eram usadas nos testes. A germinacdo era testada, em condiciies de luz branca e escuro nas temperaturas de 20,25, 30, 35, 25-20, 25-30, e 25-35"C. 0 inicio da germinacdo era mais tardio para sementes recem-coletadas. A dormencia era" reduzida com sementes armazenadas por 9 meses. A viabilidade das sementes diminuia ap6s armazenamento por 4 ou 5 anos.

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“…Yams have varying flower, fruit and seed attributes depending on species. Detailed distinctions of these attributes have been reported by various authors [4,[162][163][164]. The sticky nature of pollen promotes its pollination by insects [4].…”

Section: Pollen and Seed Dispersal Mechanismmentioning

confidence: 99%

“…A few monoecious and trimonoecious types also exist [162]. Yams have varying flower, fruit and seed attributes depending on species.…”

Section: Pollen and Seed Dispersal Mechanismmentioning

confidence: 99%

Can Parentage Analysis Facilitate Breeding Activities in Root and Tuber Crops?

et al. 2018

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Controlled pollination in root and tuber crops is challenging. Complex ploidy, cross-incompatibility, erratic flowering patterns, outcrossing, etc., limit the efficiency of breeding progress in these crops. Half-sib breeding that involves random pollination among parents is a viable method to harness genetic gain in outcrossing crops that are problematic for performing planned and controlled pollination. The authenticity of resulting progenies from the half-sib breeding is essential to monitor the selection gain in the breeding program. Parentage analysis facilitated by molecular markers is among the available handy tools for crop breeders to maximize genetic gain in a breeding program. It can help to resolve the identity of half-sib progenies and reconstruct the pedigree in the outcrossing crops. This paper reviews the potential benefits of parentage analysis in breeding selected outcrossing root and tuber crops. It assesses how paternity analysis facilitates breeding activities and the ways it improves genetic gain in the root and tuber breeding programs. Conscious use of complementary techniques in the root and tuber breeding programs can increase the selection gain by reducing the long breeding cycle and cost, as well as reliable exploitation of the heritable variation in the desired direction.

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Flowering, Pollen Grain Germination, Fruiting, Seed Germination and Seedling Development of White Yam, Dioscorea rotundata Poir

Cited by 35 publications

References 0 publications

Studies on the reproductive biology of white yam (Dioscorea rotundata Poir.)

Studies on the reproductive biology of white yam (Dioscorea rotundata Poir.)

Effects of storage on germination ofDioscorea composita (Dioscoreaceae) seeds

Can Parentage Analysis Facilitate Breeding Activities in Root and Tuber Crops?

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