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- W2059489688 abstract "Shoot apices of Sansevieria trifasciata have a three‐layered mantle, a zone of subapical initials, a central meristem, and a peripheral meristem. Leaf initiation begins with periclinal divisions in L‐3 and is followed by periclinal divisions in L‐2 and anticlinal divisions in L‐l. At first, the primordium is a mound of tissue at one point on the flank, but it soon takes the form of a low ridge encircling the apex. An ephemeral adaxial meristem differentiates in L‐2 of the primordium when it is about 50 μ high and is active until the primordium is about 450 μ high. Then it ceases basipetally and is not observable after the primordium is about 600μ high. As the adaxial meristem ceases at the base of the radial tip, its two lateral regions become the submarginal meristems of the expanded portion. Marginal meristems differentiate from the protoderm, and oblique‐anticlinal divisions of the marginal initials result in the formation of an abaxial and adaxial epidermis. These derivatives undergo a few anticlinal divisions, increasing marginal width, and then they divide periclinally, increasing marginal thickness. After the primordium is about 600‐700 μ high it continues to grow in length by a diffuse basal intercalary meristem. When the leaf is 3 dm long, an adaxial rounding meristem differentiates in the region just above the sheath. Leaf vasculature consists of parallel bundles which anastomose acropetally. Vascular bundles are arranged in a semicircle in the expanded portion and in a circle in the radial tip. There is one centrally located bundle at the apex as a result of lateral anastomoses. Present evidence from leaf ontogeny and mature vasculature in S. trifasciata is interpreted as supporting the concept that the liliaceous leaf is homologous with the phyllodes of A corns and Acacia ." @default.
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- W2059489688 date "1973-04-01" @default.
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- W2059489688 title "PHYLLODE THEORY IN RELATION TO LEAF ONTOGENY IN SANSEVIERIA TRIFASCIATA" @default.
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- W2059489688 doi "https://doi.org/10.1002/j.1537-2197.1973.tb05939.x" @default.
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