scholarly journals Survival rate and shoot growth of grafted Dahurian larch (Larix gmelinii var. japonica): a comparison between Japanese larch (L. kaempferi) and F1hybrid larch (L. gmelinii var. japonica × L. kaempferi) rootstocks

2018 ◽  
Vol 67 (1) ◽  
pp. 111-116 ◽  
Author(s):  
Kazuhito Kita ◽  
Hirokazu Kon ◽  
Wataru Ishizuka ◽  
Evgenios Agathokleous ◽  
Makoto Kuromaru
Keyword(s):  
Survival Rate ◽  
Shoot Growth ◽  
Japanese Larch ◽  
Larix Gmelinii ◽  
Dahurian Larch ◽  
Hybrid Larch ◽  
F1 Hybrid ◽  
Cultivation Period ◽  
Growth Vigor ◽  
Selection Of

Abstract We grafted scions of Dahurian larch (Larix gmelinii var. japonica) onto Japanese larch (L. kaempferi) and F1 hybrid larch (L. gmeli­nii var. japonica × L. kaempferi) rootstocks and examined root­stock-scion compatibility by assessing the survival rate (SR) in two independent experiments. Scion overgrowth on the root­stock was not observed. SR was not significantly different among rootstocks due to large interquartile ranges (IQR) among clones within a rootstock type. Results suggested that the SR was more dependent on the clonal characteristics of the scion than on the growth vigor of the rootstock. Shoot elonga­tion of grafts on F1 hybrid rootstock was superior to that of grafts on Japanese larch rootstock. Selection of an appropriate combination of scion and rootstock may improve the SR of grafted Dahurian larch and shorten the cultivation period.

Age trends in the genetic parameters of wood density and the relationship with growth rates in hybrid larch (Larix gmelinii var. japonica × L. kaempferi) F1

2006 ◽  
Vol 11 (3) ◽  
pp. 157-163 ◽  
Author(s):  
Takaaki Fujimoto ◽  
Kazuhito Kita ◽  
Kazuko Uchiyama ◽  
Makoto Kuromaru ◽  
Hisashi Akutsu ◽  
...  
Keyword(s):  
Wood Density ◽  
Growth Rates ◽  
Genetic Parameters ◽  
Larix Gmelinii ◽  
Hybrid Larch ◽  
Age Trends ◽  
The Relationship

scholarly journals Design of an F1 hybrid breeding strategy for ryegrasses based on selection of self-incompatibility locus-specific alleles

2015 ◽  
Vol 6 ◽  
Author(s):  
Luke W. Pembleton ◽  
Hiroshi Shinozuka ◽  
Junping Wang ◽  
German C. Spangenberg ◽  
John W. Forster ◽  
...  
Keyword(s):  
Breeding Strategy ◽  
Hybrid Breeding ◽  
Self Incompatibility ◽  
F1 Hybrid ◽  
Incompatibility Locus ◽  
Selection Of

A METHOD OF PHENOLOGICAL SURVEY FOR USE IN FOREST INSECT STUDIES

1956 ◽  
Vol 34 (6) ◽  
pp. 533-540 ◽  
Author(s):  
R. F. Morris ◽  
F. E. Webb ◽  
C. W. Bennett
Keyword(s):  
Shoot Growth ◽  
Growth Curves ◽  
Great Majority ◽  
Shoot Elongation ◽  
Balsam Fir ◽  
Objective Method ◽  
Forest Insect ◽  
Correct Sequence ◽  
Insect Sampling ◽  
Selection Of

To ensure correct sequence in the timing of insect sampling or control operations over a large forest area it is desirable to know what phenological differences may be expected. Measurements of shoot elongation provide a simple and objective method for comparing a large number of phenological stations in one season. By this method one or more reference stations have to be visited weekly to permit the plotting of growth curves, but the great majority of the stations have to be visited only twice a year. At any one station the major source of variance in cumulative shoot growth on a given date is between trees and the optimum allocation of sampling resources will usually be based on the selection of one shoot per tree and 10 or more trees of balsam fir per station. The variance is greater for cherry and larger samples are necessary.

scholarly journals Efficacy of Ciprofloxacin in an Experimental Model of Escherichia coli Chorioamnionitis in Rabbits

2009 ◽  
Vol 53 (4) ◽  
pp. 1624-1627 ◽  
Author(s):  
Elise Launay ◽  
Nicolas Joram ◽  
Cédric Jacqueline ◽  
Anne Francoise Miegeville ◽  
Jocelyne Caillon ◽  
...  
Keyword(s):  
Escherichia Coli ◽  
Survival Rate ◽  
Experimental Model ◽  
Resistant Mutants ◽  
Selection Of

ABSTRACT Pregnant rabbits were treated with ciprofloxacin alone or with gentamicin in a model of Escherichia coli chorioamnionitis, and the results were compared with those for untreated rabbits. The survival rate increased and the bacteremia decreased significantly in treated fetuses in comparison to controls (P = 0.003). Nevertheless, rapid selection of resistant mutants is a major limit to ciprofloxacin applications.

scholarly journals Development of Paspalum accession plugs for turfgrass establishment

2020 ◽  
Vol 26 (3) ◽  
pp. 356-366
Author(s):  
Stella Áurea Cristiane Gomes da Silva ◽  
João Carlos Cezar de Albuquerque Filho ◽  
Simone Santos Lira Silva ◽  
Ana Cecília Ribeiro de Castro ◽  
Vivian Loges
Keyword(s):  
Survival Rate ◽  
Root System ◽  
Plant Height ◽  
Coverage Rate ◽  
Control Treatment ◽  
Propagation Methods ◽  
Expansion Capacity ◽  
Turfgrass Establishment ◽  
Selection Of ◽  
Number Of Shoots

Abstract The selection of a genotype for lawn use must consider the plant survival rate and its soil covering ability, which is directly influenced by the growth of stolons and rhizomes. This study aimed to evaluate the growth and development of Paspalum accession plugs for turfgrass establishment. Plugs of six prostrate growth accessions of Paspalum lepton (PL 01), P. notatum (from PN 01 to PN 06) and Zoysia japonica (ZJ 01), which was used as the control treatment, were planted adding up to 7 treatments. At 63 days after planting, the survival rate, the number of shoots, the expansion capacity, plant height and soil coverage rate were evaluated. Moreover, at 72 days after planting, fresh and dry leaf, root, rhizome and/or stolon biomass, as well as root length were evaluated. Plugs of PL 01 presented the highest values regarding the number of shoots, the expansion capacity, soil coverage and the development of the root system with the largest biomass production. PL 01 and PN 05 along with ZJ 01 presented a high soil coverage rate and all the P. notatum (PN) accessions together with ZJ 01 maintained a lower plant height, but with a length root system higher than the control treatment ZJ 01. The P. lepton (PL 01) and P. notatum (PN 05) accessions can be recommended for turfgrass establishment using plug propagation methods.

Ray properties in the stems of Dahurian larch (Larix gmelinii) and Japanese larch (Larix kaempferi)

IAWA Journal ◽  
2020 ◽  
pp. 1-9
Author(s):  
Do Hoon Kim ◽  
Seong Hyun Kim ◽  
Jae Ik Jo ◽  
Jong Ho Kim ◽  
Byantara Darsan Purusatama ◽  
...  
Keyword(s):  
Epithelial Cell ◽  
Growth Ring ◽  
Wood Quality ◽  
Significant Negative Correlation ◽  
Cell Number ◽  
Japanese Larch ◽  
Larix Kaempferi ◽  
Dahurian Larch ◽  
Larch Wood ◽  
Ring Number

Abstract The radial variation of rays within the stems of Dahurian larch and Japanese larch growing in Korea was studied to obtain valuable information to identify the two species and determine wood quality. Uniseriate ray height, fusiform ray height, ray number, ray spacing, and epithelial cell number were investigated by optical microscopy. The heights of uniseriate and fusiform rays and epithelial cell numbers in Dahurian larch were lower than those in Japanese larch. Dahurian larch wood had greater ray number and ray spacing than Japanese larch wood. In both species, the heights of uniseriate and fusiform rays and epithelial cell number increased with increasing growth ring number but then stabilized from a certain growth ring number. However, ray number and ray spacing decreased with age but were stable toward the bark. There were significant differences in all ray properties between the two species. Furthermore, in both species, the number and spacing of rays showed a significant negative correlation with uniseriate ray height. The relationships between uniseriate and fusiform ray height, and between ray spacing and ray number were significantly positive. In conclusion, the results from this study provide basic information that can be used to identify these species, and the quality indices from ray properties will improve the effective utilization of the two woody species.

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