Systematic Studies in Some Ipomoea Linn . Species Using Pollen and Flower Morphology (original) (raw)
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Floral morphovariations Ipomoea
“Studies on Floral Morphovaritions of Genus Ipomoea L. From Nasik, Maharashtra.”, 2020
The present research article deals with the study on floral morphovariations of genus Ipomoea L.; a dominant genus belonging to family Convolvulaceae. The detailed survey and frequent field visits were conducted during the period from January 2019 to February 2020. Total 10 species have been collected and studied from various localities like swampy forest area, road side, village, water bodies, and boundaries of agricultural fields across the Nasik region. The recorded species were listed and photographically illustrated to distinguish key characters. The habit, size, shape, pattern and color of corolla well as corresponding lengths of stamens, carpels and their projection have been demonstrated so as to delimit the taxa through primary identification. The species like I.cairica, I. carnea, I. triloba and I. companulata have been found to be distributed more commonly and quite invasive having persistent growth; showed intraspecific variation, complexity in terms of floral attributes, flowering period, anthesis etc.
Numerical taxonomy of some Ipomoea (linn.) Species In South-West Nigeria
Ife Journal of Science, 2013
Numerical taxonomic studies were conducted on thirty six species of Ipomoea found in Southwestern Nigeria to improve the classification and identification of this relatively poorly known genus. Twenty-three species were collected from natural populations; thirteen species were sourced from herbarium specimens. For the field samples, specimen identification was done at the IFE herbarium, following which voucher specimens were deposited. Qualitative and quantitative characters were recorded from the vegetative and reproductive parts of the specimen. The Principal Components Analysis (PCA) and Single Linkage Cluster Analysis (SLCA) reveal radial distribution of the Ipomoea species when the power of variance reduces; at high percentage total variance, they are separated into their phenons. The interrelationships observed among the traditional sections delimited by the quantitative analyses further support the suggestion of monophyly of Ipomoea . Key words: Ipomoea , Numerical, Taxonomy,...
2019
The genus Ipomoea L. is one of the genera dominated by climbing species exhibits diversified variations particularly in leaf and floral morphology among the species. A taxonomic study was conducted for the genus in the state of Arunachal Pradesh to evaluate diversity in their morphology and flowering phenology. The extensive field study and characterization revealed that the species of Ipomoea show a great morphological diversification particularly in terms of the foliar and floral characters. All the species found are with climbing habits and the leaves are greatly varied both in their shape and sizes. The flowers are of various colour and ephemeral in nature lasting only for 7 to 12 hours. Both inter and intra specific variations in the flower colour were observed. The corolla is mostly infundibular but in some campanulate corolla is also observed. The flowering seasons also vary among the species. Some bloom twice and others once in a year. These variations in morphological chara...
Notulae Scientia Biologicae, 2013
Foliar micromorphological study was carried out on I. triloba, I. eriocarpa, I. alba, I. hederifolia, I. muricata, I. intrapilosa, I. asarifolia, I. batatas, I. aquatica, I. mauritiana, I. carnea, I.involucrata, I. nil, I. heterotricha and I. obscura to determine the patterns of variation in their epidermal characteristics and search for useful and stable anatomical characters for the identification of the species. Leaf epidermal features that provided useful specific distinctions are cell shape, anticlinal wall pattern, stomata shape, stomata type, trichome, cuticular striations, crystal, granular periclinal wall, stomata size, stomata index, scale and tannin. The characters revealed interrelationships among the Ipomoea species and also suggest their monophyly.
Biosystematics a modern tool for identification of South Indian species of Ipomoea linn
Systematics must be perceived as a science that can hold its own image in the current information era, rather than as an old fashioned stamp collecting exercise and this perception must be presented to both the general and public.To build up a natural system of classification of plants, it is necessary to compare one form with another, such parts like stem, leaf, root, flower, fruits and seeds. These superficial examinations are helpful to a certain extent in identifying and classifying the plants. The phenotype of each and every taxon is unique and this uniqueness itself is a clear identifying feature for a taxon. To a certain extent cytological, palynological, anatomical features seen to go in hand with the external morphological features.
Foliar Epidermal and Petiole Anatomical Studies of Some Nigerian Species of Ipomoea (Convolvulaceae)
2013
The foliar epidermis and petiole anatomical studies were conducted on five species of Ipomoea in Southwestern Nigeria in search of useful and stable taxonomic characters for the identification of the species. Morphological features among the taxa revealed striking similarities in their habits. All the species shared common attributes in their twinning stem and leaf shape except Ipomoea aquatica which stayed apart by the possession of sagitate leaf with alternate arrangement. The petiole anatomy showed diagnostic characters that are of taxonomic value. The results showed substantial variations in the type and shape of epidermal cells from straight to polygonal and up to wavy. Preponderance of trichomes on the abaxial surface of I. triloba could be used to delimit the species. The study provides referential pharmaco-botanical information for the correct identification of the species.
We reported the morpho-anatomy of Ipomoea coccinea L. a new record from Nigeria for the first time. Fresh plant materials (stem, petiole, and leaf) were fixed immediately in Formalin-Acetic-Alcohol for 24h, dehydrated, embedded in paraffin wax sectioned using rotary microtome, Sections were stained with Safranin and counterstained with Alcian blue and micro-photographed with trinocular research microscope fitted with Amscope digital camera. Ipomoea coccinea is twisting climber with reddish flowers; vine is up to 10 m long with alternate leaf arrangement. The leaf is amphistomatic and dorsiventral. The epidermal cells are irregular in shape with wavy anticlinal walls. The upper epidermis has only paracytic stomata while the lower epidermal surface has mainly paracytic stomata but rarely anisocytic measuring 4.36-8.7×3.9-6.24 µm. The stomata on the upper epidermis are few and mainly located close to the leaf veins. The vascular bundle in the petiole formed a semicircle with one rib trace. The abaxial and adaxial parenchymatous cortex comprised 7-11 layer of cells with crushed parenchymatous cells below the epidermal cells. The midrib outline is circular to U-shaped with long median projection measuring about 80-90 µm. The stem has protuberances, short glandular trichome, cortex 6-8 layers, and rays in radial multiples of Original Research Article
Floral biology of four Ipomoea (Tubiflorae: Convolvulaceae) species
This research was carried out to evaluate the floral biology of Ipomoea acuminata, I. batata, I. cairica and I. quamoclit in Maringá, state of Paraná. Anthesis period, stigma receptivity, viability of the pollen grains and medium height of the style and filament were analyzed during the blossom period of Ipomoea. Both I. quamoclit and I. potato had their flowers opening at 6:00 a.m. and their closing at 2:00 p.m. The test of stigma receptivity demonstrated that I. quamoclit was receptive between 6:00 a.m. and 9:00 a.m. and I. batata between 6:35 a.m. and 1:00 p.m. The period of higher viability of the pollen grains in I. quamoclit was the same of the stigma receptivity. In that species, there was a reduction in the frequency of viable grains of pollen next to the time of the flowers closing. There were highest frequencies of viable pollen grains in I. batata between 6:35 a.m. and 7:00 a.m.; the variations in the frequency of viability of the pollen grains keep along the day until the flowers closing. In I. acuminata, the medium height of the style was 27.245 ± 2.431 mm and the medium height of the filament was 26.439 ± 3.147 mm. In I. batata, the medium height of the style was 19.77 mm ± 1.956 mm that is higher than the medium height of the filament. The medium height of the style in I. cairica was 19.827 mm and the medium height of the filament was 17.952 mm. In I. quamoclit the medium height of the style and the medium height of the filament had both bigger and smaller height variations of the style. For that species the estimated differences between the medium height of the style at 8:30 a.m. and the filament 1 and 4; and between the medium height of the style at 10:30 a.m. and filament 3, 4 and 5 were significant. For I. batata the differences between the medium heights of the style and of the filament were significant.
Micromorphological Studies of the Genus Ipomoea L. (Convolvulaceae) in Nepal
Himalayan Biodiversity, 2017
Ipomoea is a large and complex genus, which comprises the largest number of species within the family Convolvulaceae. Globally, the genus consists of about 600 species of vines and shrubs, which are widely distributed throughout the tropics and the subtropics. In Nepal, the genus comprises 15 species, which are distributed throughout the tropical, subtropical and temperate region of the country. Besides few enumerations and floristic surveys, no comprehensive anatomy and pollen characters of 16 species of Ipomoea occurring in Nepal to evaluate the qualitative and quantitative differences in these characters. We found that the all species of Ipomoea have paracytic type stomata. However, there is considerable variation in the size and frequency of the stomata. The size and shape of the epidermal cells also varies from species to species. Ipomoea nil has the highest stomatal frequency, while I. purpurea has the lowest frequency. All species of Ipomoea have globose, isopolar, echinate, pentoporate and radially symmetrical pollen grains. I. quamoclit has the largest pollen, while I. aquaticahas the smallest pollen. The anatomy of stem shows no distinct structural differences among species. Although no qualitative differences in the studied characters are found among species, there is considerable variation in the quantitative characters, such as the size of stomata, frequency of stomata and pollen size. These characters could have important taxonomic and ecological implications and therefore, are as valuable as the morphological characters.