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Endosperm development in some labiatae lamiaceae

Endosperm development in some labiatae lamiaceae

Journal of the Indian Botanical Society 55(2-3): 148-159

The endosperm development in 25 spp. of Labiatae in 16 genera (Coleus, Scutellaria, Westringia, Dysophylla, Ocimum, Calamintha, Meriandra, Hyptis, Ajuga, Nepeta, Leucas, Geniosporum, Lavandula, Salvia, Leonotis, Perilla) and 6 subfamilies is described. In the species studied the development of the endosperm is ab initio cellular. Although the 1st division of the primary endosperm nucleus is invariably followed by a transverse wall, certain variations do occur in respect of the sequence and disposition of walls during the 2nd and the 3rd division. On the basis of the development, the endosperm seems to fall into 3 types: Scutellaria type (Westringia rigida and Scutellaria violacea), Brunella type (Dysophylla and Salvia) and Stachys type (Hyptis, Ocimum, Ajuga, etc.). A critical study of the endosperm development leads to the conclusion that these 3 types can be deduced from the 2-celled stage of the endosperm development. The Labiates, though from a homogeneous group, seem to have evolved along several lines as far as the endosperm is concerned. Another interesting feature recorded is the diversity of the structure and nature of the endosperm haustoria developed at the micropylar and chalazal ends. In Westringia both the micropylar and the chalzal haustoria are cellular while in Scutellaria the chalazal is cellular and the microphylar is eoenocytic. In Dysophylla the micropylar haustorium is cellular whereas the chalazal is coenocytic. In other members both the haustoria are entirely coenocytic. It is suggested that the evolution of the endosperm haustorium has apparently progressed from the cellular to the coenocytic, the latter being more aggressive and effective in function.

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Accession: 005359807

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