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Phyllotactic patterns in some members of the Vitaceae
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In addition to two opposite cotyledons, germinating seedlings of V. riparia and Vitis cv. Vivant display two other phyllotactic patterns: (1) immediately following the emergence of the cotyledons, leaves are initiated individually in a spiral pattern, usually 2/5; (2) upon the initiation of the firs...
Floral development, fruit set, and dispersal of the Gulf of St. Lawrence Aster (Symphyotrichum laurentianum) (Fernald) Nesom
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Estimation of seed bank and seed viability of the Gulf of Saint Lawrence Aster, Symphyotrichum laurentianum, (Fernald) Nesom
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The Gulf of St. Lawrence Aster, Symphyotrichum laurentianum, is a member of the family Asteraceae and is listed as "threatened" by COSEWIC (Committee on the Status of Endangered Wildlife in Canada). This rare and vulnerable halophyte grows in only a few locations in New Brunswick, Prince E...
Effect of strobilurin fungicides on control of early blight (Alternaria solani) and yield of potatoes grown under two N fertility regimes
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Classical and dynamic morphology
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Following the initiation and development of individual leaf primordia at the level of the shoot apical meristem
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Background and Aims: By using the technique of replicas of a developing apex it is possible to obtain a direct measure of phyllotactic parameters (plastochrone and platochronic ratio) involved in the initiation of two successive primordia at the level of the SAM. The goal of this study is to compare...
The developmental floral morphology of Montrichardia arborescens (Araceae) revisited
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The spadix of M. arborescens has a cylindrical or ellipsoid form at maturity and contains unisexual flowers without a perianth. The pistillate and staminate flowers are located in the basal and apical portions, respectively, of the inflorescence. In the upper portion of the female zone, there is a r...
The correlation between development of atypical bisexual flowers and phylogeny in the Aroideae (Araceae)
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In the intermediate zone of the inflorescence of genera of Aroideae one can find flowers with male and female characteristics. Until now, two types of developmental sequences of atypical bisexual flowers (ABFs) have been recognized: the Philodendron type and the Cercestis type. In the Philodendron t...
Homeosis, morphogenetic gradient and the determination of floral identity in the inflorescences of Philodendron solimoesense (Araceae)
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A comparative developmental study of the inflorescence of Philodendron solimoesense was conducted using scanning electron microscopy. The spadix of P. solimoesense is characterized by unisexual flowers. Staminate flowers are initiated on the upper portion of the spadix while pistillate flowers devel...
Development of the flower and inflorescence of Arum italicum (Araceae)
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The spadix of Arum italicum Miller consists of two main parts: a clavate sterile portion (appendix) and a cylindroid fertile portion. In the fertile portion with both male and female zones, there are two zones of sterile flowers (bristles). The basal portion of bristles is surrounded by a verrucose ...