What drives the vital rates of secondary hemiepiphytes? A first assessment for three species of Heteropsis (Araceae) in the Colombian Amazon

2015 ◽  
Vol 31 (3) ◽  
pp. 251-265 ◽  
Author(s):  
María Paula Balcázar-Vargas ◽  
Tinde R. van Andel ◽  
Paul Westers ◽  
Pieter A. Zuidema
Keyword(s):  
Growth Rates ◽  
Vegetative Propagation ◽  
Slow Growth ◽  
Gradual Increase ◽  
Leaf Size ◽  
Stem Length ◽  
Vital Rates ◽  
Size Number ◽  
Colombian Amazon ◽  
Study Species

Abstract:Secondary hemiepiphytes rely on other plants (hosts) to grow vertically. After germinating on the forest floor, their seedlings search a host to ascend. We recorded information on survival, growth, reproduction and vegetative propagation of three Heteropsis species, to evaluate what drives their vital rates. We measured 700 individuals of each study species between 2007 and 2009 in the southern Colombian Amazon. A gradual increase in stem length, leaf size, number of roots and plagiotropic branches was found with increasing height of Heteropsis individuals on their hosts. Survival of leafless non-climbing seedlings was very low (28% annually); increasing substantially (84–94%) once the seedling had ascended a host. The three Heteropsis species presented slow height growth rates (c. 2–8 cm y−1) with large variation, while a substantial percentage of the stems (31–62%) did not grow or dried out. Vegetative propagation in Heteropsis may act as a dispersion-propagation strategy to find a suitable host and reach the canopy again after falling. The slow growth rates suggest that Heteropsis individuals that have reached the canopy are rather old. Once plants have reached the tree crowns, their longevity is largely determined by the survival of the host tree.

scholarly journals STUDI MORFOLOGI DAN ANALISIS KORELASI ANTAR KARAKTER KOMPONEN HASIL TANAMAN SEREH WANGI (Cymbopogon sp.) DALAM UPAYA PERBAIKAN PRODUKSI MINYAK

2017 ◽  
Vol 27 (1) ◽  
pp. 15
Author(s):  
Djati Waluyo Djoar ◽  
Panut Sahari ◽  
Sugiyono Sugiyono
Keyword(s):  
Essential Oil ◽  
Selection Criteria ◽  
Leaf Size ◽  
Raw Material ◽  
Stem Length ◽  
Cymbopogon Citratus ◽  
Size Number ◽  
Two Samples ◽  
Linkage Method ◽  
Minimum Number

<p>Study Morphology and Correlation Analysis Inter Componen<br />Yield Caracter of Citronella (Cymbopogon citratus). Lemongrass isfamiliar in Indonesia as a cooking ingredient known as Lemongrass (Cymbopogon citratus). Citronella considered as a rare plant that most peopledo not recognize yet. There are two species of Citronella are known Citronella Lenabatu (Cymbopogon nardus) and Citronella Mahapengiri (Cymbopogon winterianus) which is an essential oil taken as a raw material tomake medicine and perfume. This research was conducted in BKPH Southern Lawu, RPH Watu kempul and consortium village of Sendang, district Jatipuro, Wonogiri on December 2010. The purpose of this research are to find morphology characteristic, yield of essential oil and the variety level of Citronella, that all used as the selection foundation to get a bit of blood. This research uses 30 samples/accessions based on Random Proportions. Observation is conducted on the characteristic of morphology and yield of essential oil, variety level is implemented based on the Cluster analysis with average linkage method. The results show that 24,90% variety of Citronella in the area is not too varied. This variation can be seen from the morphological characteristic, and the differences of yield of essential oil produced.Accessions 26 and accessions 24 have highest oil yield with 1.421% and1.25%. The two samples have similar in the morphology, which they have similar red to purple leaf color, similar in the minimum number of plants inone clump (50-100) and the tall of plant that not too high (150 cm-200 cm).Components of plant cintronella fragrant hat could be use as selection criteria including of low plant hight, shorter of leaf size, number of plants per hill slightly and Shorter of stem length.</p>

Studies on the sowing dates of cotton in the Sudan Gezira: I. The influence of date of sowing on plant growth and development

1967 ◽  
Vol 69 (3) ◽  
pp. 305-315 ◽  
Author(s):  
J. E. Jackson
Keyword(s):  
Growth Rates ◽  
Slow Growth ◽  
Seasonal Pattern ◽  
Relative Growth ◽  
Relative Growth Rates ◽  
Research Division ◽  
Sowing Dates ◽  
Net Assimilation ◽  
State Growth ◽  
Sudan Gezira

Growth analysis of cotton crops sown in the Sudan Gezira at monthly intervals between August and May revealed a marked seasonal pattern of growth. Irrespective of plant age and fruiting state growth of non-senescent plants was slowest during the cool winter months. Relative growth rates of young plants were highest in August, September and early October due to the high specific leaf areas and fairly high net assimilation rates found then. They were lowest when minimum temperatures were lowest. Net assimilation rates were also lowest in the coolest months, probably as a result of restricted growth. High temperatures in the spring reduced fruiting. It is concluded that low minimum temperatures and high evaporation rates are both associated with slow growth, and play a large part in determining the characteristic decline of growth rates of cotton sown at the usual date in August.I wish to thank the Chief of the Research Division, Ministry of Agriculture, Sudan, for permission to publish this paper and to record my gratitude to the team of field and laboratory assistants, especially Salih Saad and Hassan Osman, who helped in the work.

scholarly journals VEGETATIVE GROWTH AND NUTRIENT LEVELS OF LINGONBERRIES GROWN IN FOUR ALASKAN SUBSTRATES

1982 ◽  
Vol 62 (4) ◽  
pp. 969-977 ◽  
Author(s):  
PATRICIA S. HOLLOWAY ◽  
ROBERT M. VAN VELDHUIZEN ◽  
CECIL STUSHNOFF ◽  
DAVID K. WILDUNG
Keyword(s):  
Vegetative Growth ◽  
Sandy Loam ◽  
Leaf Size ◽  
Maximum Growth ◽  
Stem Length ◽  
Dry Matter Accumulation ◽  
Silt Loam ◽  
Tissue Samples ◽  
Silt Loam Soil ◽  
Loam Soil

Vegetative growth of lingonberries was observed on plants growing in four unsterilized, native-Alaskan substrates: coarsely-ground Lemeta peat, Fairbanks silt loam soil, a mixture of peat and silt loam soil and washed Chena very fine sandy loam soil. Following three growing seasons, plants in the peat treatment showed the greatest increase in vegetative growth as revealed by the number of new stems produced, stem length and dry weight per plant. Leaf size did not differ among substrate treatments. The leaves on plants grown in the peat substrate remained green throughout the entire experiment. The leaves of plants in all other treatments showed varying degrees of chlorosis followed by reddening and necrosis. Differences in concentration of N, P, K, Mn, Fe, Zn and Al in whole-plant tissue samples were recorded. The results indicate lingonberries should be grown in a peat substrate for maximum growth and dry matter accumulation.

scholarly journals ECOLOGICAL STUDIES ON NEPENTHES AT BARITO ULU, CENTRAL KALIMANTAN, INDONESIA

2011 ◽  
Vol 9 (3) ◽  
Author(s):  
Muhammad Mansur
Keyword(s):  
Growth Rate ◽  
Growth Rates ◽  
Stem Length ◽  
Ecological Studies ◽  
Central Kalimantan ◽  
Length Growth ◽  
Small Plot ◽  
Heath Forest ◽  
One Year ◽  
The One

Ecological studies on the Nepenthes species at Barito Ulu, Central Kalimantan, Indonesia were conducted between August 2005 and September 2006. Surveys and two small plot inventories were used to determine the diversity and population of Nepenthes at the study site. We found eight Nepenthes species around the BaritoUlu study area: N. albomarginata, N. ampullaria, N. gracilis, N. hirsuta, N. rafflesiana, N. reinwardtiana, N. stenophylla, and N. hispida. Plot A was dominated by N. rafflesiana with one other species found; whilst in plot B we found five species but it was also dominated by N. rafflesiana. In plot A, the one year stem length growth rate of N. albomarginata was faster than N. rafflesiana (5.0 and 3.5 cm respectively). While in plot B, N. gracilis (21.7 cm) and N. reinwardtiana (13.1 cm) showed faster growth rates than N. albomarginata (5.2 cm), N. rafflesiana (7.0 cm) and N. stenophylla (8.5 cm). Generally, the habitat of Nepenthes in the study site is heath forest.

scholarly journals Biology and bulb production of Eleutherine bulbosa (Iridaceae), a native species from Borneo, Indonesia

2021 ◽  
Vol 27 (2) ◽  
pp. 232-237
Author(s):  
Ni Made Armini Wiendi ◽  
Nessa Maulida ◽  
Krisantini Krisantini
Keyword(s):  
Native Species ◽  
Leaf Size ◽  
Fertilizer Application ◽  
Ornamental Plant ◽  
Rice Hulls ◽  
Secondary Axis ◽  
Size Number ◽  
Wild Harvesting ◽  
Npk Fertilizer ◽  
Shoot Emergence

Abstract Eleutherine bulbosa is a known ornamental plant of the Iris family, which originated from Central Borneo, Indonesia. The bulbs of E. bulbosa have long been used as a medicinal source by the local people of Borneo. Despite its known medicinal and other values, studies on the morphology and efficiency in bulb production of this species are limited. The aims of our study are to examine the vegetative and reproductive morphology of E. bulbosa, and to determine the effect of various dosages of NPK fertilizer on flowering and bulb production. The plants were grown in pots using potting mix consists of equal volume of burnt rice hulls, cocopeat, and organic manures (1:1:1). Our study showed that E. bulbosa has a cymose rhipidium inflorescence with 25-50 mm long peduncles, have 3-4 umbel on the secondary axis, each consists of 10-12 florets that opens in turn every day. Florets are 20-30 mm long, 20 mm in diameter, 10-15 mm pedicels, and short-lived. The perianth is white, about 25 mm wide with yellow anthers and stigma. Fruits were not formed during the duration of the study. NPK fertilizer application at the lowest dose of 1 g per pot had promoted earlier shoot emergence and vegetative growth, including plant height, leaf number, leaf size, number of tillers, and bulb production compared to control (no fertilizer). Application of fertilizer at 1 and 2 g per plant significantly promoted earlier flowering, whereas application at 3 g per plant delayed and reduced the proportion of flowering plants. The results of this study can aid in taxonomic identification and efficient cultivation of this plant for uses as potted flowering ornamentals or bulb production for different purposes. Higher cultivation and reduced wild harvesting can result in the conservation of this species.

Relationships Between RNA–DNA Ratio, Prey Density, and Growth Rate in Atlantic Cod (Gadus morhua) Larvae

1979 ◽  
Vol 36 (12) ◽  
pp. 1497-1502 ◽  
Author(s):  
L. J. Buckley
Keyword(s):  
Growth Rate ◽  
Nutritional Status ◽  
Growth Rates ◽  
Prey Density ◽  
Gadus Morhua ◽  
Slow Growth ◽  
Atlantic Cod ◽  
Larval Fish ◽  
Dry Weight ◽  
Dna And Rna

The protein, DNA, and RNA content of larvae maintained at 1.0 plankter/mL increased at the rates of 9.3, 9.9, and 9.8% per day, respectively, for the 5 wk after hatching. Protein reserves of larvae held at 0 or 0.2 plankters/mL were depleted by 45 and 35%, respectively, prior to death 12–13 d after hatching. Starved larvae had similar protein concentrations (percent of dry weight), lower RNA concentrations, and higher DNA concentrations than fed larvae. Larvae held at higher plankton densities had higher RNA–DNA ratios and faster growth rates than larvae held at lower plankton densities. The RNA–DNA ratio was significantly correlated (P < 0.01) with the protein growth rate. The RNA–DNA ratio appears to be a useful index of nutritional status in larval Atlantic cod (Gadus morhua) and may be useful for determining if cod larvae were in a period of rapid or slow growth at the time of capture. Key words: RNA–DNA ratio, starvation, protein, nucleic acids, growth, larval fish, Atlantic cod

scholarly journals Chromosome segregation in B. subtilis is highly heterogeneous

2020 ◽  
Vol 13 (1) ◽  
Author(s):  
Nina El Najjar ◽  
Peter L. Graumann
Keyword(s):  
Cell Cycle ◽  
Dna Damage ◽  
Chromosome Segregation ◽  
Growth Rates ◽  
Slow Growth ◽  
Growth Conditions ◽  
Single Chromosome ◽  
Copy Numbers ◽  
Initiation Of Replication ◽  
Bacterial Cell Cycle

Abstract Objective The bacterial cell cycle comprises initiation of replication and ensuing elongation, concomitant chromosome segregation (in some organisms with a delay termed cohesion), and finally cell division. By quantifying the number of origin and terminus regions in exponentially growing Bacillus subtilis cells, and after induction of DNA damage, we aimed at determining cell cycle parameters at different growth rates at a single cell level. Results B. subtilis cells are mostly mero-oligoploid during fast growth and diploid during slow growth. However, we found that the number of replication origins and of termini is highly heterogeneous within the cell population at two different growth rates, and that even at slow growth, a majority of cells attempts to maintain more than a single chromosome at all times of the cell cycle. Heterogeneity of chromosome copy numbers may reflect different subpopulations having diverging growth rates even during exponential growth conditions. Cells continued to initiate replication and segregate chromosomes after induction of DNA damage, as judged by an increase in origin numbers per cell, showing that replication and segregation are relatively robust against cell cycle perturbation.

scholarly journals GENETIC DIVERSITY AMONG SWEET POTATO CROPS CULTIVATED BY TRADITIONAL FARMERS

2018 ◽  
Vol 31 (3) ◽  
pp. 779-790 ◽  
Author(s):  
PABLO FORLAN VARGAS ◽  
ERIC WATZKE ENGELKING ◽  
LUIS CARLOS FERREIRA DE ALMEIDA ◽  
ELIEL ALVES FERREIRA ◽  
HAMILTON CESAR DE OLIVERIA CHARLO
Keyword(s):  
Genetic Diversity ◽  
Sweet Potato ◽  
Ipomoea Batatas ◽  
Block Design ◽  
Genetic Material ◽  
Morphological Characteristics ◽  
Leaf Size ◽  
Stem Length ◽  
Phenotypic Correlation ◽  
Crop Species

ABSTRACT The genetic variability within the crop species Ipomoea batatas is broad, hence, in order to support future breeding programs it is of the utmost importance that germplasm banks be created, conserved, and characterized. Therefore, the objective of this work was to rescue and evaluate the genetic divergence in sweet potato accessions collected in traditional communities of Vale do Ribeira Paulista. Sweet potato samples were collected from quilombos, indigenous villages, caiçaras communities, and small farms. The study was conducted between February 2013 and August 2014 in a randomized block design with three replications. Genetic material included 95 collected accessions and two commercial cultivars. Morphological characteristics of the accessions were evaluated and distances in the genetic distance matrix were estimated by means of multi-category variables, the data being subsequently clustered by the Tocher method. Analysis of the relative contribution of each characteristic and phenotypic correlation of descriptors was also performed. Results evidenced wide genetic diversity among the sweet potato accessions collected in Vale do Ribeira, which were not grouped according to the collection point. The descriptors that contributed more than 60% of genetic diversity included: leaf size, general leaf profile, immature leaf color, petiole pigmentation, predominant branch color, branch secondary color, stem length, cortical thickness, predominant periderm color, and periderm color intensity. Correlations between morphological descriptors was observed in 22.26% of the paired traits.

scholarly journals Impurity influence on normal grain growth in the GISP2 ice core, Greenland

1996 ◽  
Vol 42 (141) ◽  
pp. 255-260 ◽  
Author(s):  
R. B Alley ◽  
G. A. Woods
Keyword(s):  
Growth Rate ◽  
Grain Size ◽  
Isotopic Composition ◽  
Grain Growth ◽  
Forest Fire ◽  
Growth Rates ◽  
Slow Growth ◽  
Ice Core ◽  
Isotopic Data ◽  
Thin Sections

AbstractIntercept analysis of approximately bi-yearly vertical thin sections from the upper part of the GISP2 ice Core, central Greenland, shows that grain-size ranges increase with increasing age. This demonstrates that something in the ice affects grain-growth rates, and that grain-size cannot be used directly in paleothermometry as has been proposed. Correlation of grain-growth rates to chemical and isotopic data indicates slower growth in ice with higher impurity concentrations, and especially slow growth in “forest-fire” layers containing abundant ammonium; however, the impurity/grain-growth relations are quite noisy. Little correlation is found between growth rate and isotopic composition of ice.

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