scholarly journals Zygotic embryogenesis and empty seed formation in European larch (Larix decidua Mill.)

2005 ◽  
Vol 62 (2) ◽  
pp. 129-134 ◽  
Author(s):  
Branko Slobodník ◽  
Helmut Guttenberger
Keyword(s):  
Larix Decidua ◽  
Zygotic Embryogenesis ◽  
European Larch ◽  
Seed Formation ◽  
Empty Seed

scholarly journals Pollination success and full seed percentage in European larch (Larix decidua MILL.)

2019 ◽  
Vol 48 (No. 6) ◽  
pp. 271-280 ◽  
Author(s):  
B. Slobodník
Keyword(s):  
Correlation Analysis ◽  
Correlation Coefficients ◽  
Critical Value ◽  
Larix Decidua ◽  
European Larch ◽  
Seed Formation ◽  
Pollination Success ◽  
Empty Seed ◽  
Linear Correlation Analysis ◽  
The Mean

A relationship between the success of pollination and the percentage of full seeds of European larch (Larix decidua MILL.) was studied using several models of non-linear correlation analysis. Although the proportion of pollinated ovules was high in most cases (especially in the middle parts of open-pollinated conelets), the mean percentage of full seeds was extraordinarily low (after the controlled self-pollination even close to zero) and most of the calculated correlation coefficients are lower than the corresponding critical value. This fact gives an evidence for the strong effect of additional important factors causing the empty seed formation in Larix even after the successful pollination of ovules.

scholarly journals Mating pattern and empty seed formation in relation to crown level of Larix decidua (Mill.) clones.

Silva Fennica ◽  
1991 ◽  
Vol 25 (4) ◽  
Author(s):  
Jaroslaw Burczyk ◽  
Grzegorz Kosiński ◽  
Andrzej Lewandowski
Keyword(s):  
Larix Decidua ◽  
Mating Pattern ◽  
Seed Formation ◽  
Empty Seed

scholarly journals Time since death and decay rate constants of Norway spruce and European larch deadwood in subalpine forests determined using dendrochronology and radiocarbon dating

2016 ◽  
Vol 13 (5) ◽  
pp. 1537-1552 ◽  
Author(s):  
Marta Petrillo ◽  
Paolo Cherubini ◽  
Giulia Fravolini ◽  
Marco Marchetti ◽  
Judith Ascher-Jenull ◽  
...  
Keyword(s):  
Picea Abies ◽  
Decay Rate ◽  
Norway Spruce ◽  
Matrix Model ◽  
Rate Constants ◽  
Radiocarbon Dating ◽  
Time Lag ◽  
Larix Decidua ◽  
European Larch ◽  
14C Dating

Abstract. Due to the large size (e.g. sections of tree trunks) and highly heterogeneous spatial distribution of deadwood, the timescales involved in the coarse woody debris (CWD) decay of Picea abies (L.) Karst. and Larix decidua Mill. in Alpine forests are largely unknown. We investigated the CWD decay dynamics in an Alpine valley in Italy using the chronosequence approach and the five-decay class system that is based on a macromorphological assessment. For the decay classes 1–3, most of the dendrochronological samples were cross-dated to assess the time that had elapsed since tree death, but for decay classes 4 and 5 (poorly preserved tree rings) radiocarbon dating was used. In addition, density, cellulose, and lignin data were measured for the dated CWD. The decay rate constants for spruce and larch were estimated on the basis of the density loss using a single negative exponential model, a regression approach, and the stage-based matrix model. In the decay classes 1–3, the ages of the CWD were similar and varied between 1 and 54 years for spruce and 3 and 40 years for larch, with no significant differences between the classes; classes 1–3 are therefore not indicative of deadwood age. This seems to be due to a time lag between the death of a standing tree and its contact with the soil. We found distinct tree-species-specific differences in decay classes 4 and 5, with larch CWD reaching an average age of 210 years in class 5 and spruce only 77 years. The mean CWD rate constants were estimated to be in the range 0.018 to 0.022 y−1 for spruce and to about 0.012 y−1 for larch. Snapshot sampling (chronosequences) may overestimate the age and mean residence time of CWD. No sampling bias was, however, detectable using the stage-based matrix model. Cellulose and lignin time trends could be derived on the basis of the ages of the CWD. The half-lives for cellulose were 21 years for spruce and 50 years for larch. The half-life of lignin is considerably higher and may be more than 100 years in larch CWD. Consequently, the decay of Picea abies and Larix decidua is very low. Several uncertainties, however, remain: 14C dating of CWD from decay classes 4 and 5 and having a pre-bomb age is often difficult (large age range due to methodological constraints) and fall rates of both European larch and Norway spruce are missing.

scholarly journals Effects of Drought and Salinity on European Larch (Larix decidua Mill.) Seedlings

Forests ◽  
2018 ◽  
Vol 9 (6) ◽  
pp. 320 ◽  
Author(s):  
Ioana Plesa ◽  
Sara González-Orenga ◽  
Mohamad Al Hassan ◽  
Adriana Sestras ◽  
Oscar Vicente ◽  
...  
Keyword(s):  
Larix Decidua ◽  
European Larch ◽  
Effects Of Drought

scholarly journals Biochemical Markers of Salt Stress in European Larch (Larix decidua)

2018 ◽  
Vol 10 (3) ◽  
pp. 430-438 ◽  
Author(s):  
Ioana PLESA ◽  
Mohamad AL HASSAN ◽  
Adriana F. SESTRAS ◽  
Oscar VICENTE ◽  
Monica BOSCAIU ◽  
...  
Keyword(s):  
Salt Stress ◽  
Urban Areas ◽  
Biochemical Markers ◽  
Larix Decidua ◽  
Stem Length ◽  
Relative Reduction ◽  
European Larch ◽  
Stress Markers ◽  
Steady Level ◽  
Different Populations

Larix decidua, the European larch, does not grow in natural saline areas, but it can be affected by salinity either by the common practice of winter de-icing of mountain roads with NaCl, or when grown as an ornamental tree in urban areas by the use of low quality, salinised irrigation water. In the present study, the responses to salt stress of young seedlings obtained from seeds of seven Carpathian larch populations were analysed. After 30 days of treatments with 150 mM NaCl, growth and biochemical parameters were determinated. Salt stress inhibited growth of all seedlings, as shown by the relative reduction of stem length and fresh weight, and induced significant changes in the needle levels of several biochemical stress markers. Seedlings from all populations showed a marked reduction of photosynthetic pigments contents and an increase of proline and malondialdehyde (MDA) concentrations. Under salt stress, plants accumulated Na+ and Cl- in the needles, whereas K+ was maintained at a steady level. Responses of seedlings from the different populations were similar, with only small quantitative differences that did not allow the identification of more salt tolerant genotypes. However, the study revealed that several of the biochemical markers mentioned above can be suitable for the rapid and non-destructive assessment of the effects of salinity in European larch.

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