scholarly journals Clonal Propagation ofKhaya senegalensis: The Effects of Stem Length, Leaf Area, Auxins, Smoke Solution, and Stockplant Age

2011 ◽  
Vol 2011 ◽  
pp. 1-10 ◽  
Author(s):  
Catherine Ky-Dembele ◽  
Mulualem Tigabu ◽  
Jules Bayala ◽  
Patrice Savadogo ◽  
Issaka Joseph Boussim ◽  
...  
Keyword(s):  
Leaf Area ◽  
Clonal Propagation ◽  
Stem Length ◽  
Timber Species ◽  
Plantation Establishment ◽  
Mature Trees ◽  
Rooting Ability ◽  
Khaya Senegalensis ◽  
Cutting Length ◽  
Rooting Of Cuttings

Khaya senegalensisis a multipurpose African timber species. The development of clonal propagation could improve plantation establishment, which is currently impeded by mahogany shoot borer. To examine its potential for clonal propagation, the effects of cutting length, leaf area, stockplant maturation, auxin, and smoke solution treatments were investigated. Leafy cuttings rooted well (up to 80%) compared to leafless cuttings (0%). Cuttings taken from seedlings rooted well (at least 95%), but cuttings obtained from older trees rooted poorly (5% maximum). The rooting ability of cuttings collected from older trees was improved (16% maximum) by pollarding. Auxin application enhanced root length and the number of roots while smoke solution did not improve cuttings' rooting ability. These results indicate that juvenileK. senegalensisis amenable to clonal propagation, but further work is required to improve the rooting of cuttings from mature trees.

scholarly journals El Niño-Southern Oscillation affects the water relations of tree species in the Yucatan Peninsula, Mexico

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Jorge Palomo-Kumul ◽  
Mirna Valdez-Hernández ◽  
Gerald A. Islebe ◽  
Manuel J. Cach-Pérez ◽  
José Luis Andrade
Keyword(s):  
Water Potential ◽  
Leaf Area ◽  
Tropical Forests ◽  
Specific Leaf Area ◽  
Tree Species ◽  
Deciduous Species ◽  
Mature Trees ◽  
Seasonally Dry ◽  
Seasonally Dry Tropical Forests ◽  
Dry Tropical Forests

AbstractWe evaluated the effect of ENSO 2015/16 on the water relations of eight tree species in seasonally dry tropical forests of the Yucatan Peninsula, Mexico. The functional traits: wood density, relative water content in wood, xylem water potential and specific leaf area were recorded during the rainy season and compared in three consecutive years: 2015 (pre-ENSO conditions), 2016 (ENSO conditions) and 2017 (post-ENSO conditions). We analyzed tree size on the capacity to respond to water deficit, considering young and mature trees, and if this response is distinctive in species with different leaf patterns in seasonally dry tropical forests distributed along a precipitation gradient (700–1200 mm year−1). These traits showed a strong decrease in all species in response to water stress in 2016, mainly in the driest site. Deciduous species had lower wood density, higher predawn water potential and higher specific leaf area than evergreen species. In all cases, mature trees were more tolerant to drought. In the driest site, there was a significant reduction in water status, regardless of their leaf phenology, indicating that seasonally dry tropical forests are highly vulnerable to ENSO. Vulnerability of deciduous species is intensified in the driest areas and in the youngest trees.

Growth and morphological responses of yellow birch, sugar maple, and beech seedlings growing under a natural light gradient

1998 ◽  
Vol 28 (7) ◽  
pp. 1007-1015 ◽  
Author(s):  
Marilou Beaudet ◽  
Christian Messier
Keyword(s):  
Leaf Area ◽  
Sugar Maple ◽  
Fagus Grandifolia ◽  
Stem Length ◽  
Betula Alleghaniensis ◽  
Yellow Birch ◽  
Morphological Response ◽  
Area Index ◽  
Light Gradient ◽  
Morphological Responses

Height and lateral growth, biomass distribution, leaf morphology, and crown architecture were studied in yellow birch (Betula alleghaniensis Britton), sugar maple (Acer saccharum Marsh.), and beech (Fagus grandifolia Ehrh.) seedlings growing under 1-50% of above-canopy light in a sugar maple stand, in Quebec. All three species showed increasing growth with increasing light, but growth of yellow birch was higher and more responsive than that of sugar maple and beech. All three species showed typical sun-shade morphological responses, such as decreasing specific leaf area and leaf area ratio, and increasing leaf area index, with increasing light availability. Sugar maple was morphologically more plastic than the other species. It showed variations in biomass allocation to leaves and branches, a decrease in branch length to seedling height ratio, and a marked increase in the ratio of leaf area to stem length. Although our results clearly demonstrate the ability of these three species to modify several of their morphological features in response to variations in light, they do not show a clear relationship between species shade tolerance and morphological response to light variations. We suggest that species-specific developmental patterns may act as important constraints to morphological acclimation to light variation.

scholarly journals Comparison of Rootability of Stem Cuttings from Seedlings of Aesculus sp. and Mature Aesculus × arnoldiana ‘Autumn Splendor’

1988 ◽  
Vol 6 (2) ◽  
pp. 69-71
Author(s):  
B.A. Bergmann ◽  
W.P. Hackett ◽  
H. Pellett
Keyword(s):  
Butyric Acid ◽  
Developmental Stages ◽  
Stem Cuttings ◽  
Mature Tree ◽  
Mature Trees ◽  
Old Growth ◽  
Rooting Of Cuttings ◽  
Root Suckers ◽  
Stem Segments

Rootability was evaluated for stem cuttings taken at varying positions and developmental stages from seedlings of Aesculus and from the mature trees of Aesculus × arnoldiana ‘Autumn Splendor’. Rooting was 100% for cuttings taken from 2-week-old seedlings and 0% for those obtained from the crown of the mature tree 2 months after commencement of spring growth flush. Intermediate rootability was found for cuttings taken from 1-month-old seedlings and from the 2 week-old growth of suckers at the base of the mature tree. Rooting of cuttings with intermediate rooting potential was increased by a quick dip treatment with 2500 ppm indole-3-butyric acid (IBA) or by using apical rather than basal stem segments. Commercially acceptable rooting was not achieved using cuttings from root suckers or the crown of Aesculus ‘Augumn Splendor’.

scholarly journals Growth Regulation of Sub-Tropical Perennials by Photoselective Plastic Films

2001 ◽  
Vol 19 (2) ◽  
pp. 65-68
Author(s):  
Sandra B. Wilson ◽  
Nihal C. Rajapakse
Keyword(s):  
Leaf Area ◽  
Plant Height ◽  
Plant Species ◽  
Spectral Distribution ◽  
Growth Regulation ◽  
Dry Weight ◽  
Stem Length ◽  
Plastic Films ◽  
Control Film ◽  
Leaf Dry Weight

Abstract Plant response to photoselective plastic films with varying spectral distribution properties was tested using three sub-tropical perennials: golden shrimp plant (Pachystachys lutea), Persian shield (Strobilanthes dyerianus), and cat whiskers (Orthosiphon stamineus). Films were designated YXE-10 [far-red (FR) light-absorbing film] and SXE-4 [red (R) light absorbing film]. Light transmitted through YXE-10 films reduced plant height (stem length) of golden shrimp plant and cat whiskers by 10 and 20%, respectively. Light transmitted through SXE-4 films increased plant height by 9% for golden shrimp plant but did not significantly increase stem length of Persian shield and cat whiskers species. Chlorophyll, leaf area, and mean days to flower generally were not affected by photoselective films, with the exception that cat whisker plants grown under YXE-10 films had reduced leaf area when compared to plants grown under SXE-4 or control films. As compared to the control film, light transmitted through YXE-10 films reduced leaf dry weight by 22–31% and stem dry weight by 19–28%, depending on the plant species. Root dry weight was not affected by spectral films.

scholarly journals Effects of Seeds Source and Manure Type on Germination and Early Growth of Khaya senegalensis (Desr) A. Juss Seedlings in Bauchi State, Nigeria

2019 ◽  
pp. 1-10
Author(s):  
E. M. Abubakar ◽  
E. K. Rabo
Keyword(s):  
Growth Rate ◽  
Leaf Area ◽  
Early Growth ◽  
Leaf Length ◽  
Leaf Width ◽  
Deciduous Tree ◽  
Cow Dung ◽  
Khaya Senegalensis ◽  
Number Of Leaves ◽  
Collar Diameter

Khaya senegalensis (Desr) A. Juss is a perennial deciduous tree which has many uses in developing nations. The population of the tree is rapidly declining due to no conservation efforts to prevent the species from endanger and extinction. At the moment there is dearth information on manure types required to raise healthy seedlings of the tree species in the study area. To conserve this genetic resource, germination and early growth rate experiment was carried out using seeds collected from three locations (eco-zones) (Alkaleri, Bauchi and Toro). Matured seeds of K. senegalensis were collected from mother tree stand in the three locations. One hundred and fifty seeds (150) from each location were sown in perforated polythene pots at an average depth of 2-3 cm. After germination i.e. 30 days after planting, different manures were applied to the seedlings. The experiment was laid out in a Completely Randomized Design (CRD) with three treatments, namely: poultry dung, cow dung and NPK manures; the experiment was replicated four times. Data on seeds germination variables of interest (seedling heights, number of leaves, collar diameter, leaf area, leaf width, leaf length and fresh weights) were measured. Seedlings height were measured using meter rule, collar diameters using a venier caliper, numbers of leaves were determined by manual counting the number of leaves on the seedlings, leaf area was measured by tracing leaves of seedling on a graduated graph sheet. Data collected on seed germination and early growth rate were subjected to descriptive statistics and inferential statistics (ANOVA). Where significant differences occurred, Tukey test was used to separate the means. Based on this finding, germination of seeds commenced after 10 to 14 days. Locations and manure types had significant effects on the mean heights, number of leaves, collar diameter, leaf area, leaf width, length and fresh weights of K. senegalensis seedlings in the study area. Thus, for species conservation and genetic heredity, seeds sourced from Bauchi eco-zone was the best with poultry manure as the best performed manure for the raising of K. senegalensis seedlings in the study area.

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