The gynoecium structure in Dracaena fragrans (L.) Ker Gawl., Sansevieria parva N.E. Brown and S. trifasciata Prain (Asparagaceae) with special emphasis on the structure of the septal nectary

2017

Acta Agrobot

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The general morphology and micromorphology of the flower in Polygonatum multiflorum, Maianthemum bifolium, and Convallaria majalis were studied using light microscopy methods. Among the studied species, P. multiflorum and C. majalis have syntepalous and trimerous flowers, and in M. bifolium flowers are the most reduced: they are dimerous, pentacyclic, and with free tepals. Only in P. multiflorum stamens are considerably adnate to the floral tube. The gynoecium of P. multiflorum consists of synascidiate, hemisymplicate, and asymplicate zones. In the gynoecium of M. bifolium and C. majalis, synascidiate, symplicate, and asymplicate vertical zones were revealed. In P. multiflorum and M. bifolium, the style is composed of postgenitally connated carpels, while in C. majalis the style is formed by congenitally fused carpels (symplicate gynoecium zone). A common pattern of the venation of the floral parts was revealed in all the species.The external flower morphology and the gynoecium inner structure are different in all three species, providing adaptations for the pollination mode. Attractive elements observed in the flower of P. multiflorum are the long septal nectary in the ovary and epidermal trichomes on the inner perigonium surface and on the filaments. In M. bifolium, a rudimentary external septal nectary was observed for the first time. No nectaries or other morphologically distinct secretory structures were found in the C. majalis flower, allowing considering the C. majalis flowers as pollen flowers.

“…-Dracaena and Sansevieria [22,38] and is more than 1/5 of the ovary height in P. multiflorum and C. majalis. The ovary roof height is shorter in the studied species.…”

Section: Gynoecium Micromorphology and General Considerationsmentioning

confidence: 99%

Section: Gynoecium Micromorphology and General Considerationsmentioning

confidence: 99%

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The flower morphology in three Convallariaceae species with various attractive traits

Odintsova

2017

Acta Agrobot

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“…Integration of the data of molecular phylogenetics and comparative evolutionary morphology of the flower is a promising direction for the creating of the contemporary evolutionary system of orders, families, subfamilies and genera. Study of micromorphology and vascular anatomy of the flower of monocots is a contemporary method of the study of evolutionary morphology (Fishchuk et al, 2013;Nuraliev & Sokoloff, 2014, Odintsova & Fishchuk, 2017. Molecular-phylogenetic reconstructions of the Amaryllidaceae J. St.-Hil.…”

Section: Introductionmentioning

confidence: 99%

Micromorphology and anatomy of the flowers of Galanthus nivalis and Leucojum vernum (Amaryllidaceae)

Odintsova

2020

Regul. Mech. Biosyst.

We studied the structure of flowers of Galanthus nivalis and Leucojum vernum using cross-sections and longitudal sections of permanent preparations using a light microscope. Genera Galanthus and Leucojum belong to the Galantheae tribe characterized by a unique combination of features of the family Amaryllidaceae, i.e. absence of septal nectaries, poricidal anthers and fruit – fleshy capsule. Both species are represented in the flora of Ukraine and have the life form of bulb ephemeroid of decidous forests. Microscopic surveys of flowers are considered as an instrument for determining yet unknown structural adaptations of plants to specialized ways of pollination and determining the first stages of morphogenesis of fruit, because many features of the fruit appear already at the stage of flower. We determined that the tepals of both studied species have multi-bundle traces of 8–9 vascular bundles. Apical dehiscence of the anthers occurs due to short longitudinal sutures in the upper part of the anthers. The nectar disk on the roof of the inferior ovary is poorly differentiated, and has no vascular bundles. We associate the indicated peculiarities of the flower structure with the offer of pollen as the main reward of the pollinator during buzz-polination, which has not reported for the studied species. Placentation is axile in the lower part of the ovary and parietal in the upper one. We consider that the gynoecium of the studied species is eusyncarpous. The vascular system of the inferior ovary is composed of three dorsal and three septal veins, paired ventral bundles of carpels, which form the traces of ovules, and also small additional bundles in the wall of the ovary. For the first time, we have determined the presence of airy parenchyma in the ovules, ovary roof, the style and anthers’ connectives and have confirmed their presence in the tepals and the wall of the ovary at the stage of flowering. We found differentiation of the mesocarp into photosynthesizing and airy parenchyma, small sizes of cells of the endocardium in the area of the dorsal vein, bifurcate dorsal bundles of the carpels, which could be considered as adaptation of different stages of morphogenesis of fruit to dehiscence. Anatomical peculiarities of the ovaries of G. nivalis and L. vernum: numerous vascular bundles in the pericarp, thick parenchyma mesocarp with air-filled cavities, non-lignified endocarp at the stage of the flower we consider adaptations to the formation of fleshy fruit. The new data we obtained on the anatomical structure of the flowers is a significant addition of information about anthecological and carpological (post-anthetic) peculiarities of the surveyed species.

“…Для побудови сучасної еволюційної системи порядків, родин, підродин та родів поєднання даних молекулярної філогенетики та еволюційної порівняльної морфології квітки є перспективним напрямком дослідження. Вивчення мікроморфології та васкулярної анатомії квітки однодольних є сучасним напрямком дослідження еволюційної морфології [2,9,16]. Молекулярно-філогенетичні реконструкції родини Amaryllidaceae J.St.-Hil.…”

unclassified

Мікроморфологія Та Анатомія Квітки Leucojum Aestivum L. (Amaryllidaceae J. St.-Hil.)

2020

TernopilBioSciIssues

In the gynoecium of L. aestivum there are synascidiate, hemisynascidiate, symplicate, and asymplicate vertical zones. The longest zone is the fertile hemisynascidiate zone and the shortest is the synascidiate zone in the ovary. It was discovered that in L. aestivum the peduncle consists of 12 vascular bundles, which are reorganized into two circles of bundles, the outer with massive leading bundles, departing as dorsal bundles of perianth, traces of perianth tepals and septal bundles of carpels and inner circle of bundles over the nests are divided into three groups of ventral carpel bundles are lined up on four, which are located in the center of the ovary and providing nutrition to the ovules. Dorsal carpels bundles are double. Above the locule, ventral bundles of the carpel, as well as the double septal bundles, merge with the dorsal bundles and form a dorsal vein. The outer tepals of the simple perianth have nine vascular traces, and the inner tepals of the perianth have eight vascular traces. Traces of stamens are single-bundle, formed from traces of perianth tepals. The ovary has features of the early stages of fruit morphogenesis and adaptation to disclosure, such as differentiation of mesocarp and endocarp cells, double dorsal bundles of carpels. Structural flower features related to pollen proposal as reward pollinators. Since ovary is a structural basis of the fruit, histological ovary wall differentiation reflects the features of the subsequent morphogenesis of the fruit.