Does pollen abortion increase with plant age?

2005 ◽  
Vol 85 (1) ◽  
pp. 151-153 ◽  
Author(s):  
Ashoke Bhattacharya
Keyword(s):  
Tropical Forest ◽  
Genetic Load ◽  
Size Variation ◽  
Forest Tree ◽  
Plant Age ◽  
Steady Increase ◽  
Pollen Abortion ◽  
The Family ◽  
Key Words Age ◽  
Pollen:Ovule Ratio

The large tropical forest tree, Anacardium excelsum (Bertero & Balb. Ex Kunth) Skeels, of the family Anacardiaceae, was studied in Panama. Using Alexander’s stain, which differentiates aborted and non-aborted pollen, the proportion of aborted pollen versus plant age, size variation in aborted and non-aborted pollen and pollen:ovule ratio were estimated. Aborted pollen was smaller than non-aborted pollen regardless of plant age. The proportion of aborted pollen varied from 15.8 to 54.7% showing a steady increase with plant age, and the pollen:ovule ratio also increased with age. These results support the qualitative prediction that pollen abortion gradually increases with ageing reflecting an increase in genetic load with age. Key words: Age effect, reproductive success, tropical forest

Breaking of seed coat dormancy in a medicinal plant Tetrapleura tetraptera (Schum & Thonn)

1988 ◽  
Vol 111 (2) ◽  
pp. 393-394 ◽  
Author(s):  
C. S. Odoemena
Keyword(s):  
Medicinal Plant ◽  
Tropical Forest ◽  
Seed Coat ◽  
Post Partum ◽  
Forest Tree ◽  
West African ◽  
Traditional Medicines ◽  
Tetrapleura Tetraptera ◽  
The Family ◽  
Nursing Mothers

Tetrapleura tetraptera (Schum & Thonn) is a member of the Family Mimosaceae. It is a perennial, wild West African tropical forest tree (Hutchinson & Dalziel, 1973) and is extensively used in many traditional medicines. The fruit is used in Nigeria as a spice added to soup for nursing mothers from the day of delivery to about 1 month postnatally, to prevent post-partum contractions.

A case of gender equality: absence of sex-related costs in a dioecious tropical forest tree species

Plant Ecology ◽  
2021 ◽  
Author(s):  
Valéria Forni Martins ◽  
Rafaela Letícia Brito Bispo ◽  
Priscilla de Paula Loiola
Keyword(s):  
Tropical Forest ◽  
Gender Equality ◽  
Tree Species ◽  
Forest Tree ◽  
Forest Tree Species

scholarly journals Stability of tropical forest tree carbon‐water relations in a rainfall exclusion treatment through shifts in effective water uptake depth

2021 ◽  
Author(s):  
Alexandria L. Pivovaroff ◽  
Nate G. McDowell ◽  
Tayana Barrozo Rodrigues ◽  
Tim Brodribb ◽  
Lucas A. Cernusak ◽  
...  
Keyword(s):  
Tropical Forest ◽  
Water Uptake ◽  
Water Relations ◽  
Forest Tree ◽  
Effective Water

EVALUATION OF GENETIC FIDELITY FOLLOWING LONG TERM CRYOPRESERVATION OF CONIFEROUS FOREST TREE SPECIES OF THE FAMILY PINACEAE

2014 ◽  
pp. 121-126
Author(s):  
H. Häggman ◽  
S. Sutela ◽  
J. Edesi ◽  
J. Krajňáková ◽  
A. Bertolini ◽  
...  
Keyword(s):  
Tree Species ◽  
Coniferous Forest ◽  
Genetic Fidelity ◽  
Forest Tree ◽  
Forest Tree Species ◽  
The Family

scholarly journals PHYTOCHEMICAL PROFILING AND ANTIBACTERIAL EFFICACY SCREENING OF AGLAIA MALABARICA SASIDH

2018 ◽  
Vol 10 (1) ◽  
pp. 20
Author(s):  
Archana Elamkulam Ravindran ◽  
John Ernest Thoppil
Keyword(s):  
Secondary Metabolites ◽  
Inhibitory Concentration ◽  
Forest Tree ◽  
Diffusion Method ◽  
Antibacterial Efficacy ◽  
Proteus Vulgaris ◽  
Disc Diffusion Method ◽  
Antibacterial Study ◽  
The Family ◽  
Phytochemical Constituents

Objective: Aglaia malabarica is an unexplored endemic forest tree belonging to the family Meliaceae. The present study was conducted to screen the phytochemical constituents of the leaf extract, to analyze the important secondary metabolites and to determine the antibacterial efficacy of the plant extract.Methods: Antibacterial activity was studied using agar based disc diffusion method. Four strains of bacteria were used for the antibacterial study that includes Staphylococcus aureus, Pseudomonas aeruginosae, Proteus vulgaris and Bacillus megaterium.Results: The presence of constituents like, carbohydrates, proteins, tannins, phenols, terpenoids, flavonoids, alkaloids and steroids were confirmed. Saponin was found to be absent. The secondary metabolites quantified were terpenoids, phenols and flavanoids, which were found in considerable amounts. The minimum inhibitory concentration (MIC) of all the bacteria studied was found to be 500 µg methanolic leaf extract.Conclusion: The plant extract was found to be highly potent against both the Gram positive and Gram negative strains and this property may be attributed to the potent phytochemicals revealed in the extract.

scholarly journals Alterations in the lipid and soluble sugar content of melanoxylon brauna seeds during natural and accelerated ageing

2010 ◽  
Vol 32 (3) ◽  
pp. 152-162 ◽  
Author(s):  
Viviana Borges Corte ◽  
Eduardo Euclydes de Lima e Borges ◽  
José Francisco de Carvalho Gonçalves ◽  
Mirian Sousa Silva
Keyword(s):  
Fatty Acids ◽  
Tropical Forest ◽  
Sugar Content ◽  
Soluble Sugar ◽  
Soluble Sugars ◽  
Forest Tree ◽  
Accelerated Ageing ◽  
Natural Ageing ◽  
Metabolic Reactions ◽  
Tree Seeds

The decay of seeds is irreversible and at best can only be delayed by applying techniques that reduce the velocity of the metabolic reactions involved. There is little information on the biochemistry of tropical forest tree seeds related to their storability. It was investigated the influence of the composition of lipids and soluble sugars of two storage compartments, the cotyledons and the embryonic axis, of Melanoxylon brauna Schot. (Leguminosae- Caesalpinioideae), a hardwood known as black brauna, seeds stored at 20 ºC for 0, 3, 6, 9 and 12 months (natural ageing) and for 0, 24, 48, 72 and 96 hours at 40 ºC (accelerated ageing). The levels of fatty acids and monosaccharides varied differentially in each of the embryo storage compartments. Changes in oligosaccharide levels were similar for both types of ageing, diminishing in both compartments. Ageing can be attributed to the significant decrease of oligosaccharides and the increase of glucose in both types of ageing and both embryo compartments.

The role of great apes in seed dispersal of the tropical forest tree species Dacryodes normandii (Burseraceae) in Gabon

2015 ◽  
Vol 31 (5) ◽  
pp. 395-402 ◽  
Author(s):  
Barbara Haurez ◽  
Kasso Daïnou ◽  
Nikki Tagg ◽  
Charles-Albert Petre ◽  
Jean-Louis Doucet
Keyword(s):  
Seed Dispersal ◽  
Tropical Forest ◽  
Tree Species ◽  
Central Africa ◽  
Great Apes ◽  
Forest Tree ◽  
Sampling Effort ◽  
Predator Species ◽  
High Germination ◽  
Visit Duration

Abstract:The identification of seed dispersers and predators is essential to understand the effect of anthropogenic disturbances, and the associated defaunation process, on tropical forest dynamics in Central Africa. In this study, the animals involved in seed predation and dispersal of Dacryodes normandii (Burseraceae), an endozoochorously dispersed tree species endemic to Gabonese forests, were identified in a site in south-east Gabon using two complementary methods: direct observation and camera-trap monitoring of fruit piles. The combined sampling effort (172 h of direct observations and 796 d of camera trapping) led to the identification of six disperser and eight predator species of D. normandii seeds. With high frequency of consumption (88% and 57% of their visits, respectively) and long visit duration (83 and 23 min, respectively), the western lowland gorilla and central chimpanzee were identified as the main dispersers of this species. Seeds passed through the gorilla gut exhibited high germination success (68%). Rodents were identified as predators of D. normandii seeds, potentially displaying rare secondary dispersal through scatter-hoarding. The results of this study highlight the importance of great apes in the seed dispersal of this tree species.

Sign in / Sign up

Export Citation Format

Share Document