Issues concerning reproductive isolation in a rice hybrid swarm involving &lt;i&gt;Oryza sativa&lt;/i&gt; Linn., O. longistaminata A. Chev. et Roehr. and &lt;i&gt;Oryza glaberrima&lt;/i&gt; Steud. located in Jebba Nigeria

Bolaji, Abolade Oluremi; Nwokeocha, Chinyere Constance

doi:10.4314/ijbcs.v7i5.21

Cited by 5 publications

(5 citation statements)

References 14 publications

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“…These were stained with cotton-blue-in-lactophenol for 30 minutes. A total of 100 pollen grains were examined using the light microscope for percentage stainability following the methods of Bolaji & Nwokeocha (2013). The wellformed and deeply stained pollens were considered viable, while those with a collapsed outline, partially stained or not stained, were considered non-viable.…”

Section: Methodsmentioning

confidence: 99%

Reproductive biology of green-stemmed and red-stemmed Basella alba

2022

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Basella alba is an important, underutilised vegetable rich in vitamins and consumed in many parts of the world. However, the reproductive biology of this species is insufficiently known; therefore, this study was performed aiming to fill this knowledge gap. Although green-stemmed and red-stemmed Basella alba share a lot of reproductive attributes in common, the obtained results showed differences in their flower bud apex colour, anther colour, spike colour, days to 50% flowering, plant height at flower bud initiation and the mean number of flowers per spike. In both forms, the floral attributes favoured self-pollination. However, the possibility of cross-pollination among them due to the activities of pollinators such as ants, moths, butterflies and bees suggests a mixed mating system. Furthermore, both forms attained sexual maturity at varying periods, thus indicating the existence of a temporal prezygotic barrier between them and limiting the chances of their hybridisation. They could also be responsible for the ability to remain in their distinct forms even when they exist together in the same habitat.

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Section: Methodsmentioning

confidence: 99%

Reproductive biology of green-stemmed and red-stemmed Basella alba

2022

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“…The details of the structure of the cyanthia of the four different species studied were investigated with the aid of the dissecting microscope; while the pollen viability study was carried out by harvesting pollen grains from freshly-dehisced anthers onto microscope slides. They were stained with Cotton-Blue-in-Lactophenol for 30 minutes and examined under the light microscope for percentage stainability following the methods of Bolaji and Nwokeocha (2013). The well-formed and deeply stained pollens were considered viable while those with collapsed outline and partially stained or not stained at all were considered to be non-fertile (Faluyi, 1985).…”

Section: Methodsmentioning

confidence: 99%

Reproductive biology of four weedy <i>Euphorbia</i> species from Ile-Ife, Nigeria

Bolaji¹,

Idowu-Aiye²,

Moronfade³

2020

ijs

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Euphorbia heterophylla Linn., Euphorbia hirta Linn., Euphorbia hyssopifolia Linn. and Euphorbia prostrata Linn. are four noxious, yet economically important weeds, useful as phytomedicine in some parts of the world and also in Nigeria. Studies were carried out on their reproductive biology with a view to understanding the mode of their spread. Parameters investigated include number of days to seedling emergence, germinationpercentage, number of days to flowering, period to anthesis, pollinators, pollen viability, pollen size, floral structure, fruits type, seeds type, average number of fruit per plant, average number of seeds per plant and mode of seed dispersal. Results obtained showed that the seedlings of the four Euphorbia species studied emerged within 3 to 5 days; numbers of days to 50% flowering took 44 to 58 days; while flowering and fruiting continuedthroughout the remaining part of the year; thus exhibited r-strategy, expending more time and allocation of resources on their reproductive phases than their vegetative phases. Also differences existed in their stigma shape, perianth colour, perianth texture, pollen sizes, pollen viability as well as ripened colour of seed which were all significant characters that could be useful in delimiting the species. Furthermore, the study revealed that thefour species were essentially insect pollinated and their seeds dispersed by means of explosive mechanism usually characteristic of their schizocarpic fruits. This ability as well as their tendency to exhibit r-strategy could probably account for their ability to spread and invade cultivated fields, waste lands and roadsides. Keywords: Explosive mechanism, r-Strategy, Seed dispersal, Pollen viability, Seed set

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“…Given their limited genetic diversity, intra-subspecific hybrid vigor now only provides rice breeders with limited yield increases, whereas the distant hybrids derived from intersubspecific even interspecific crosses performed stronger heterosis. However, severe reproductive isolation, such as that incurred by interspecific and intersubspecific hybrid sterility, limits the extensive utilization of these rice distant hybrids (Ikeda et al, 2009;Bolaji and Nwokeocha, 2014). Therefore, hybrid sterility studies should also aim to overcome the reproductive barrier, so as to enable breeders to utilize the valuable extant genetic resources and obtain the strong vigor of these hybrids.…”

Section: Strategies For Overcoming Hybrid Sterility In Rice Improvementmentioning

confidence: 99%