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Syncyte formation in the microsporangium of Chrysanthemum (Asteraceae): a pathway to infraspecific polyploidy
In diploid individuals of both C. zawadskii and C. indicum, the fusion between two adjacent pollen mother cells (PMCs) occurs at a frequency of 1.1–1.3% early in the first meiotic division, producing four 2n pollen grains that are able to germinate.
Embryology of Amborella (Amborellaceae): Descriptions and Polarity of Character States
Comparisons with two other basal angiosperms (Nymphaeaceae and Illiciales) showed that most of the embryological features of Amborella are plesiomorphies, and contrary to all previous descriptions,Amborella has hemianatropous, rather than anatropous or orthotropic, ovules.
Phylogenetic analyses of Malpighiales using plastid and nuclear DNA sequences, with particular reference to the embryology of Euphorbiaceae sens. str.
A four-gene analysis using all sequence data provided the best resolution, resulting in the single most parsimonious tree of Malpighiales, and both Acalyphoideae and Euphorbioideae were paraphyletic, requiring more comprehensive analyses.
Floral scent chemistry of mangrove plants
- H. Azuma, M. Toyota, Y. Asakawa, T. Takaso, H. Tobe
- Environmental ScienceJournal of Plant Research
- 1 February 2002
This study analyzed the floral scent chemistry of mangroves on Iriomote Island (located near Taiwan) including Bruguiera gymnorrhiza, Kandelia candel, and Nypa fruticans to identify chemicals found in the floral scents of the various species.
Delayed fertilization and pollen-tube growth in pistils of Fagus japonica (Fagaceae).
Investigation of pollen-tube growth in pistils of Fagus japonica finds that delayed fertilization plays an important role in gametophyte competition and selection leading to nonrandom fertilization.
EMBRYOLOGY AND KARYOMORPHOLOGY OF LACTORIDACEAE
An embryological analysis of Myrtales : its definition and characteristics
Embryological evidence indicates a considerable degree of heterogeneity in Rhizophoraceae, a family or group of families that is clearly not assignable to Myrtales.
Ovules and seeds in Acalyphoideae (Euphorbiaceae): structure and systematic implications
Within the remaining genera of Acalyphoideae, a significant diversity is found in ovule and seed morphology with respect to the thickness of the inner and outer integument, the size of chalaza, vascularization of an outerIntegument and an aril.
Ovules and Seeds in Subfamily Phyllanthoideae (Euphorbiaceae): Structure and Systematic Implications
Lingelsheimia (Didymocistus and Hymenocardia) are distinct from the rest of the subfamily in having a thick inner integument, an exotegmen composed of cuboidal cells (type II), and vascular bundles in the outer integument and, as molecular evidence suggests, should be transferred to a separate family Putranjivaceae.
Mode of pollen-tube growth in Pistils of Myrica rubra (Myricaceae): a comparison with related families.
Pollen tubes in M. rubra differs from other families in that the pollen tubes arrest their growth on the nucellar surface, probably digesting nutrient fromnucellar cells.