scholarly journals The growth of flower bud, life history, and population structure of Rafflesia arnoldii (Rafflesiaceae) in Bengkulu, Sumatra, Indonesia

2020 ◽  
Vol 21 (2) ◽  
Author(s):  
AGUS SUSATYA
Keyword(s):  
Population Structure ◽  
Life History ◽  
Male Flower ◽  
Female Flower ◽  
Exponential Model ◽  
Flower Buds ◽  
Flower Bud ◽  
Dynamics Of Population ◽  
History Of ◽  
Two Populations

Abstract. Susatya A. 2020. The growth of flower bud, life history, and population structure of Rafflesia arnoldii (Rafflesiaceae) in Bengkulu, Sumatra, Indonesia. Biodiversitas 21: 792-798. The life history of Rafflesia arnoldii R.Br. is the reflection of the complex interaction between flower bud development and the external environments in order to reach its optimal survivorship. The objectives of the study were to determine the growth of flower buds at various development stages, to reconstruct the life history, and to know the population structure of R. arnoldii. The study was carried out at Taba Penanjung, Bengkulu Province, Indonesia. Two populations consisting of 17 individual buds of R. arnoldii were selected for the research. All buds were categorized into six visible stages, mapped, measured their diameters, and recorded their fates every two weeks for six months. The exponential model of growth development was applied to reconstruct the life history. The results showed that buds from the perigone stage respectively grew 3.5 and 12 times faster than those from the bract and cupule stages. The exponential growth of flower bud was confirmed, and explained by Y = 0.785 e0.0052 X, where Y and X were respectively diameter and age of flower bud. The complete life history of R. arnoldii required 3.5 to 5 years, where a female flower needed a longer time than a male flower. The population structure of R. arnoldii was not constant, but changed dynamically over time. The dynamics of population structure was mainly caused by the high mortality of small buds and the low flower bud recruitment.

Population structure and life history of Siriella jaltensis (Crustacea: Mysida) in the Ebre Delta (NW Mediterranean)

2018 ◽  
Vol 23 ◽  
pp. 39-46
Author(s):  
Lídia Delgado ◽  
Guillermo Guerao ◽  
Cristina Fortuny ◽  
Carles Ribera
Keyword(s):  
Population Structure ◽  
Life History ◽  
Nw Mediterranean ◽  
History Of

scholarly journals An asexual flower of Silene latifolia and Microbotryum lychnidis-dioicae promoting its sexual-organ development

2019 ◽  
Author(s):  
Hiroki Kawamoto ◽  
Kaori Yamanaka ◽  
Ayako koizumi ◽  
Kotaro Ishii ◽  
Yusuke Kazama ◽  
...  
Keyword(s):  
Male Flower ◽  
Female Flower ◽  
Silene Latifolia ◽  
Flowering Plant ◽  
Flower Bud ◽  
Bud Development ◽  
Stamen Development ◽  
The Family ◽  
Flower Bud Development ◽  
Gynoecium Development

AbstractSilene latifolia is a dioecious flowering plant with sex chromosomes in the family Caryophyllaceae. Development of a gynoecium and stamens are suppressed in the male and female flowers of S. latifolia, respectively. Microbtryum lychnidis-dioicae promotes stamen development when it infects the female flower. If suppression of the stamen and gynoecium development is regulated by the same mechanism, suppression of gynoecium and stamen development is released simultaneously with the infection by M. lychnidis-dioicae. To assess this hypothesis, an asexual mutant, without gynoecium or stamen, was infected with M. lychnidis-dioicae. A filament of the stamen in the infected asexual mutant was elongated at stages 11 and 12 of the flower bud development as well as the male, but the gynoecium did not form. Instead of the gynoecium, a filamentous structure was suppressed as in the male flower. Developmental suppression of the stamen was released by M. lychnidis-dioicae, but that of gynoecium development was not released. It is thought, therefore, that the suppression of gynoecium development was not released by the infection of M. lychnidis-dioicae. M. lychnidis-dioicae would have a function similar to SPF since the elongation of the stamen that is not observed in the healthy asexual mutant was observed after stage 8 of flower bud development. Such an infection experiment also that the Y chromosome of the asexual mutant has genes related to the differentiation of archesporial cells, but none related to maturation of the tapetal cells.

scholarly journals Aspects of the life history of the Tamesí molly, Poecilia latipunctata, from two populations in the Río Tamesí drainage in northeastern Mexico

2021 ◽  
Vol 92 (0) ◽  
pp. 923107
Author(s):  
Rudiger Riesch ◽  
Amber M. Makowicz ◽  
Brandon Joachim ◽  
Francisco J. García-De León ◽  
Ingo Schlupp
Keyword(s):  
Life History ◽  
History Of ◽  
Northeastern Mexico ◽  
Two Populations

Ontogeny of floral organs and morphology of floral apex in Phellodendron amurense (Rutaceae)

2002 ◽  
Vol 50 (5) ◽  
pp. 633 ◽  
Author(s):  
Qingyuan Zhou ◽  
Yinzheng Wang ◽  
Xiaobai Jin
Keyword(s):  
Laser Scanning ◽  
Male Flower ◽  
Female Flower ◽  
Laser Scanning Confocal Microscopy ◽  
Morphological Evidence ◽  
Phellodendron Amurense ◽  
Flower Buds ◽  
Floral Organs ◽  
Floral Apex ◽  
Female Flowers

The ontogeny of floral organs and the morphology of floral apex in the dioecious Phellodendron amurense Rupr. were investigated by light microscopy (LM), scanning electron microscopy (SEM) and laser scanning confocal microscopy (LSCM). Investigations indicated that P. amurense is hermaphroditic in its organisation and a common set of floral organs (sepals, petals, stamens and carpels) arise in all flowers during the early stages of development. Later, selective abortion of gynoecium and androecium occurs resulting in dimorphic unisexual flowers. The carpels in male flower buds become different from those in female flower buds soon after their initiation. The stamens of female flowers are not differentiated into anthers and filaments before abortion. The poorly differentiated carpel of male flowers never develops normal structures. Floral morphological evidence supports that Zanthoxylum, Tetradium and Phellodendron are related to one another in a linear sequence. LSCM revealed some interesting features on the apical meristem surface such as zonal differentiation, a triangular or sectorial cell, radiating cell files and linear rows of anticlinal cell walls fluorescing relatively brightly. The concept of carpel-enhancing meristem in the floral apex is tentatively proposed to account for the different fates of carpel development in male and female flowers in P. amurense.

The Enigmatic Life History of the Symbiotic Crab Tunicotheres moseri (Crustacea, Brachyura, Pinnotheridae): Implications for Its Mating System and Population Structure

2012 ◽  
Vol 223 (3) ◽  
pp. 278-290 ◽  
Author(s):  
J. E. Hernández ◽  
J. A. Bolaños ◽  
J. L. Palazón ◽  
G. Hernández ◽  
C. Lira ◽  
...  
Keyword(s):  
Population Structure ◽  
Life History ◽  
Mating System ◽  
History Of

The use of nest-traps to study behavior, population structure and life history of Procambarus spiculifer

2014 ◽  
Vol 20 (1) ◽  
pp. 1-10 ◽  
Author(s):  
David Bechler ◽  
Philip Hightower ◽  
Josh Rousy ◽  
Michael Smith
Keyword(s):  
Population Structure ◽  
Life History ◽  
Study Behavior ◽  
History Of

scholarly journals Direct shoot regeneration from male immature flower buds of Musa paradisiaca Linn. cv. Poovan (AAB)

2018 ◽  
Vol 5 (4) ◽  
pp. 142-148
Author(s):  
Anjana R G Nair ◽  
P Ravichandran ◽  
Mathew Bejoy
Keyword(s):  
Shoot Regeneration ◽  
Male Flower ◽  
Basal Region ◽  
Ms Medium ◽  
Direct Shoot Regeneration ◽  
Benzyl Adenine ◽  
Flower Buds ◽  
Flower Bud ◽  
Musa Paradisiaca ◽  
Direct Shoot

A tissue culture system has been developed to multiply Musa paradisiaca cv. Poovan using male immature flower bud and to establish it in ex vitro condition. Size of explants has been found an influencing factor for culture initiation. Immature male flower bud segments of 3 cm size were ideal for better survival and subsequent shoot regeneration. Direct shoot regeneration was achieved from male immature flower buds on Murashige and Skoog (MS) medium supplemented with varying concentrations of plant growth regulators. Initially, actively dividing meristematic region developed at the basal region of flower buds near the bract axil, which later grew into green shoot buds in most of the PGR treatments. Single use of benzyl adenine were found beneficial than kinetin or addition of indole-3-acetic acid. Maximum production of 31.0 ± 0.65 shoots was achieved on MS + 3% sucrose + 6 mg/L benzyl adenine in 15 weeks. Isolated healthy shoots were rooted in half-strength MS medium with 150 mg/L activated charcoal + 30 g/L sucrose + 1 mg/L indole-3-butyric acid within 15 days and they established successfully in greenhouse conditions with 85 % survival.

North Caucasus

2021 ◽  
pp. 66-84
Author(s):  
Konstantin Kazenin
Keyword(s):  
Population Structure ◽  
Population Growth ◽  
Ethnic Group ◽  
Historical Perspective ◽  
Ethnic Composition ◽  
North Caucasus ◽  
The North ◽  
Dynamics Of Population ◽  
History Of ◽  
Administrative Area

This chapter deals with the dynamics of population structure and the ethnic composition of the North Caucasus within the recent hundred years. It also discusses changes in the administrative divisions of the region during that period. For each administrative area of the North Caucasus, the chapter describes the distribution of its population across geographical zones and major migration processes observed in the Soviet and post-Soviet epochs. This chapter also evaluates the size of each ethnic group from a historical perspective and presents changes of ethnic proportions which took place in the administrative areas of the North Caucasus in the time of the USSR and afterward. Special attention is paid to urbanization and to population growth in ethnically mixed zones, especially in the recent decades. It is shown that the Republics of the North Caucasus differ considerably in different ethnic groups. In addition, this chapter also presents the history of the formation of national Republics in the North Caucasus.

Sign in / Sign up

Export Citation Format

Share Document