Year: 2018 | Month: June | Volume 6 | Issue 1
Microsporogenesis in Melilotus indicus (L.) All
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Abstract:
The anther development in Melilotus indicus, an annual fodder legume follows the dicotyledonous type. The mature anther is tetrasporangiate and its wall is comprised of the outermost epidermis followed by endothecium, single middle layer and the innermost secretory tapetum. Melilotus indicus bears 10 stamens of around 1.5 to 2 mm long that are arranged in a 9+1diadelphous manner. These tiny dorsifixed stamens produce a small number of microspores in each microsporangium. At the sporogenous stage of microsporogenesis, tapetal cells become irregular, full of proteinaceous material and during late ontogeny a transverse septum is observed in some of the microsporangia. The septum is of tapetal origin that seems to be an adaptation for better nourishment of developing microspores. The mature pollen grain of Melilotus indica is oblong and tricolporate. The exine is reticulate, well differentiated into ektexine and endexine. The ektexine is well distinguished in a tectum, bacula, and foot layer
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