scholarly journals Two new combinations in Oreocharis (Gesneriaceae) based on morphological, molecular and cytological evidence

PhytoKeys ◽  
2020 ◽  
Vol 157 ◽  
pp. 43-58
Author(s):  
Li-Hua Yang ◽  
Fang Wen ◽  
Hang-Hui Kong ◽  
Zhi-Xia Sun ◽  
Lan-Ying Su ◽  
...  
Keyword(s):  
New Combinations ◽  
Cytological Evidence ◽  
Species Relationship ◽  
Geographical Data ◽  
Short Filament ◽  
Floral Diversity ◽  
Floral Characters

The newly-circumscribed genus Oreocharis is recently enlarged by incorporating ten other genera with high floral diversity. In this study, our morphological, molecular and cytological evidence supports our adding two species from other two different genera (Boeica and Beccarinda) to Oreocharis. The special corolla shape (campanulate or flat-faced) and related short filament of these two new combinations, Oreocharis guileana and O. baolianis, further enrich the diversity of floral characters of the enlarged Oreocharis. Meanwhile, some supplementary and amended descriptions of these two species are made here. Our morphological, molecular and geographical data indicate that O. guileana is related to O. pilosopetiolata to a certain extent. For O. baolianis, however, our current dataset does not allow conclusions on the species relationship within Oreocharis.

scholarly journals Isotrema putalengense, a new species of Aristolochiaceae from northern Vietnam and two new combinations in Isotrema

2021 ◽  
Author(s):  
Quoc Binh Nguyen ◽  
Hieu Cuong Nguyen ◽  
Duc Binh Tran ◽  
Phuong Hanh Nguyen ◽  
Hong Truong Luu
Keyword(s):  
New Species ◽  
New Combinations ◽  
Morphological Comparison ◽  
Northern Vietnam ◽  
Floral Characters ◽  
A New Species

Isotrema putalengense Luu, Q.B.Nguyen & H.C.Nguyen is described as a new species from northern Vietnam. It looks most morphologically like I. wardianum but is distinguishable by a combination of different leafy and floral characters. Morphological comparison between the new plant and closest species is provided. In addition, combinations of two recently described Aristolochia species are made, namely Isotrema vuquangense (T.V.Do) Luu, Q.B.Nguyen & H.C.Nguyen and Isotrema yachangense (B.G.Huang, Yan Liu & Y.S.Huang) Luu, Q.B.Nguyen & H.C.Nguyen.

Diversity in floral characters of monoecious nutmeg (Myristica fragrans Houtt.)

1970 ◽  
pp. 66
Author(s):  
S Aarthi, J Rema, B Sasikumar, K V Saji, M Anandaraj
Keyword(s):  
Pollen Viability ◽  
Male Flower ◽  
Leaf Axil ◽  
Hermaphrodite Flower ◽  
Floral Diversity ◽  
Flower Type ◽  
Myristica Fragrans Houtt ◽  
Floral Characters ◽  
First Time ◽  
Single Ovary

Floral diversity in monoecious type nutmeg reveals three types of flowers namely; pistillate, staminate and hermaphrodite flowers. The structure of hermaphrodite flowers in nutmeg is reported for the first time. The flowers are borne on the leaf axil, flowering habit of the three types of flowers are seen in cymes as well solitary in the same tree. The gynoecium consists of single ovary with bifid stigma in the pistillate flowers and the androecium of staminate flowers has adnate 7-13 anthers. Intra flower variability is evident in case of hermaphrodite flowers. In hermaphrodite flower the androecium ranges with 1-4 anthers, in the form of fused filament or free filament or both; some anthers are fused with the gynoecium. Besides remnants of the stamen in the developed fruits of hermaphrodite flowers, staminodes are also observed in the flowers. Colour of all the three types of flowers are light creamy yellow, with thick gamosepalous perianth which bursts as bilobed, trilobed, tetralobed and pentalobed lobes during anthesis. Analysis of variance of trees for flower types and floral attributes like flower type, number of anthers, length of anthers, length of filaments and length of ovary are found to be highly significant. High coefficient of variation is recorded for hermaphrodite (183.84) and pistillate (171.71%) flowers. The pollen viability of the hermaphrodite flowers are found less as compared to the staminate flowers. The percentage of pollen viability is 79.74% and 90.77% in hermaphrodite and male flower respectively. In the population studied, the occurrence of hermaphrodite flower in monoecious tree ranged from 0 - 10%.

CHROMOSOME RELATIONSHIPS AND MORPHOLOGICAL COMPARISONS BETWEEN THE DIPLOID OATS AVENA PROSTRATA, A. CANARIENSIS AND THE TETRAPLOID A. MAROCCANA

1980 ◽  
Vol 22 (2) ◽  
pp. 287-294 ◽  
Author(s):  
J. M. Leggett
Keyword(s):  
Chromosome Pairing ◽  
Cytological Evidence ◽  
Geographical Data ◽  
Tetraploid Hybrid ◽  
A Genome

The morphology and chromosome pairing of the triploid hybrids Avena canariensis Baum, Rajhathy et Sampson × A. maroccana Gdgr., A. prostrata Ladiz × A. maroccana, the diploid A. prostrata and the tetraploid derived between A. prostrata and A. canariensis and the tetraploid hybrid between this derived tetraploid and A. maroccana are described in relation to genomic affinities between these species. The cytological evidence is at variance with morphological and geographical data which initially indicated that A. canariensis was the donor of the A genome of the A. maroccana-A. murphyi group of tetraploids. The possible relationship between the species is briefly discussed.

scholarly journals Recognition of the genus Thaumatophyllum Schott − formerly Philodendron subg. Meconostigma (Araceae) − based on molecular and morphological evidence

PhytoKeys ◽  
2018 ◽  
Vol 98 ◽  
pp. 51-71 ◽  
Author(s):  
Cassia Mônica Sakuragui ◽  
Luana Silva Braucks Calazans ◽  
Leticia Loss de Oliveira ◽  
Érica Barroso de Morais ◽  
Ana Maria Benko-Iseppon ◽  
...  
Keyword(s):  
Geographical Distribution ◽  
Morphological Characters ◽  
Morphological Evidence ◽  
New Combinations ◽  
Cytological Evidence ◽  
Distinct Genus

PhilodendronsubgenusMeconostigma has been a well-circumscribed group since 1829. Members of this group are easily distinguished by diagnostic morphological characters as well as by a distinct ecology and geographical distribution. Based on molecular, morphological and cytological evidence, we propose the recognition of P.subg.Meconostigma as a distinct genus, Thaumatophyllum Schott. We also present the necessary new combinations, an emended key and some nomenclatural and taxonomic corrections regarding 21 names of Thaumatophyllum.

Systematics studies in Pliniinae (Myrtaceae) necessitate two new combinations in Eugenia (Myrtaceae)

Phytotaxa ◽  
2021 ◽  
Vol 508 (2) ◽  
Author(s):  
ALINE STADNIK ◽  
DIANA K. D. CALDAS ◽  
MARCELO C. SOUZA ◽  
EVE J. LUCAS ◽  
JOSÉ FERNANDO A. BAUMGRATZ ◽  
...  
Keyword(s):  
Molecular Phylogeny ◽  
Morphological Features ◽  
New Combinations ◽  
Generic Concept ◽  
Geographical Data ◽  
Mistaken Identity ◽  
Morphological Studies

Although Eugenia and Plinia genera belong to different subtribes in Myrteae (Myrtaceae), shared morphological features have led to frequent mistaken identity to these species. Molecular phylogeny and morphological studies in Plinia show that Plinia martinellii and Plinia sebastianopolitana should be combined within the generic concept of Eugenia. In addition, two synonymizations under Plinia sebastianopolitana and one under Plinia martinellii are proposed. Commentary on these nnomenclatural adjustments, as well as on morphological and geographical data related to the evolution of these lineages is also provided.

Some Conditions Necessary for Pinocytosis

1968 ◽  
Vol 26 ◽  
pp. 142-143
Author(s):  
M. W. Brightman
Keyword(s):  
Smooth Muscle ◽  
Cell Membrane ◽  
Toxic Effects ◽  
Cytological Evidence ◽  
Cell Processes

The cytological evidence for pinocytosis is the focal infolding of the cell membrane to form surface pits that eventually pinch off and move into the cytoplasm. This activity, which can be inhibited by oxidative and glycolytic poisons, is performed only by cell processes that are at least 300A wide. However, the interpretation of such toxic effects becomes equivocal if the membrane invaginations do not normally lead to the formation of migratory vesicles, as in some endothelia and in smooth muscle. The present study is an attempt to set forth some conditions under which pinocytosis, as distinct from the mere inclusion of material in surface invaginations, can take place.

Ultrastructural analysis of collagen formation in the developing primate amnion

1990 ◽  
Vol 48 (3) ◽  
pp. 106-107
Author(s):  
Barry F. King ◽  
Grete N. Fry
Keyword(s):  
Golgi Apparatus ◽  
Collagen Fibril ◽  
Fibril Formation ◽  
Amniotic Cavity ◽  
Cytological Evidence ◽  
Mammalian Embryo ◽  
Intracellular Location ◽  
Collagen Formation ◽  
Amniotic Epithelium ◽  
Extraembryonic Mesoderm

The amnion surrounding the mammalian embryo consists of the amniotic epithelium facing the amniotic cavity, a layer of extraembryonic mesoderm bordering the exocoelom and an intervening layer of extracellular matrix (Fig. 1). During gestation the amnion expands remarkably to acommodate the rapidly growing embryo. In this study we have examined the process of collagen fibril formation in the developing amnion of the rhesus monkey between 20 and 60 days of gestation.Most cytological evidence of collagen fibril formation was observed in association with the extraembryonic mesodermal cells rather than the amniotic epithelium. The mesodermal cells h ad abundant cisternae of rough endoplasmic reticulum and a prominent Golgi apparatus. Elongated secretory vacuoles were associated with the Golgi apparatus and often contained parallel aggregates of fine filaments (Fig. 2). In some secretory vacuoles, periodic densities also were observed. Some striated collagen fibrils were observed in an apparent intracellular location in long, membrane-limited compartments (Fig. 3). Still other striated fibrils were observed in dense bodies, presumably lysosomes (Fig. 4).

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