Floral ontogeny inMazus pumilus (Scrophulariaceae) |
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Authors: | Ramaveer Rawat Devendra K Awasthi Vishnu Kumar |
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Institution: | (1) Department of Botany, M.M.P-G. College, 201204 Modinagar, India;(2) Department of Botany, Meerut University, 250005 Meerut, India |
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Abstract: | InMazus pumilus, all the floral appendages are initiated in acropetal sequence in the second cell layer (except stamens) of the floral primordium
by periclinal divisions. The actinomorphic calyx tube is formed due to zonal growth. The zygomorphy in corolla is evident
from the inception of petal primordia which arise sequentially as independent units in order of one anterior, a pair of anterio-lateral
followed by a pair of posterio-lateral. Later these primordia exhibit differential growth because of which zygomorphy becomes
more pronounced. The upper corolla tube is formed by interprimordial growth and lower corolla tube by zonal growth. Stamens
are initiated in the third layer of the floral apex. Unlike sepals and petals, in the development of stamens (4) underlying
cells of corpus also contribute. Posterior stamen is absent. The stamens become epipetalous because of interprimordial and
zonal growth in the common region below the bases of petals as well as stamens. The two carpel primordia arise as crescent
shaped structures which become continuous due to interprimordial growth. The ovary is formed by a ring of zonal meristem.
The style develops later between stigma and ovary because of intercalary growth. The residual apex grows vertically along
with the ovary and forms the septum of the ovary. All the floral appendages exhibit similar pattern of histogenesis and early
growth suggesting thereby the appendicular nature of these appendages. |
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Keywords: | Differentiation Floral histogenesis Mazus pumilus Scrophulariaceae |
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