Báo cáo lâm nghiệp: "Changes in endogenous cytokinins during flowering induction in Douglas fir: effect of exogenous applications N Imbau" potx

... & Bonnet-Masimbert M. (1988) Possible role of isopentenyladenine and isopentenyladenosine in flowering of Pseudotsuga menziesii: endo- genous variations and exogenous applications. Plant ... Endogenous cy- tokinins were analyzed in Douglas fir, ini- tially in the sexual buds and then in the shoots during floral differentiation. Then, the...

Ngày tải lên: 09/08/2014, 04:20

... F.T., Plant propagation princi- ples and practices, Prentice Hall International, Inc., Singapore, 1990. [14] Kitchen S.G., Meyer S.E., Seed germination of intermountain pens- temons as influenced ... pre-emergence seedling dumping-off was important. In contrast, either GA application or cold storage at 4 °C for at least one month significantly led to a two-fold increase of germination a...

Ngày tải lên: 08/08/2014, 01:22

... drying as average number of tips found in 20 main root sections (< 1 mm in diameter) of 5 cm in length including their side branches. e level of mycorrhizal infection was evaluated using ... occurrence During the investigation period 2004–2006, fruiting bodies of macromycetes were collected in regular intervals, approximately once or twice a month during the main f...

Ngày tải lên: 07/08/2014, 03:22

... explain the relation between tree nutrition and fresh needle total nitrogen content. Our findings concerning total nitrogen (%) contents of L + F layers (Table 3) reveal similarity with N  ... C :N and low lignin :N ratios and modest soluble nitrogen content. In our study we recorded organic matter contents between 85.0–76.3% and 54.4–20.9% in L + F and H layers at the a...

Ngày tải lên: 07/08/2014, 03:22

... second cutting intervention. Differences in ozone concentra- tions are not significant, and they indicate that the stocking density does not play an important role in association with ozone affecting ... quality and on pollutants entering the environment provides a contribution for defining conditions for natural regeneration in beech ecosystems and for applying regeneration cuts, incl...

Ngày tải lên: 07/08/2014, 03:22

... control). e decline in the levels of isorhapontin and astringin continued 24 h after PF application representing less than 68% and 50%, respectively, of the contents determined in the control ... decrease in concentrations of stilbene glycosides. e decrease in isorhapontin (occurring in the highest concentrations in embryogenic cell cul- tures), astringin and piceid...

Ngày tải lên: 07/08/2014, 10:21

... speci- fied in greater detail in the following years during swarming (2011–2012). We evaluated the correlation between the course of temperatures and the beginning and intensity of swarming of adults ... higher than the 10-year average (Š 2007). e great fluctua- tions in the intensity of swarming were due to low evening and night temperatures (rain). During the enti...

Ngày tải lên: 07/08/2014, 10:21

... Syca - more seedlings survive only when they germinate in open spaces (canopy openings) where they have favourable light conditions and are able to gain and maintain height advantage over beech. ... increased in European nitrogen- polluted forests, following the drastic increase in atmospheric nitrogen inputs in Europe since the early 1980’s (B et al. 1998). In comparison...

Ngày tải lên: 07/08/2014, 10:22

... whole-plant, stem, root, but not leaf, C concentrations in both watering con- ditions (table III). Indeed plant N uptake was significantly increased in CO 2 -enriched plants (+35%, ... isotope composition and P Gross (INRA Champenoux) for the CO 2 facilities installation. REFERENCES Arnone JA, Gordon JC (1990) Effect of nodulation, nitrogen fixatio...

Ngày tải lên: 08/08/2014, 18:21

... is unwise, since the concentrations used in such experiments are generally in excess of those experienced presently in rural Britain, and the fumigations are often conducted ... Changes of partitioning and increased root lengths of spruce and beech exposed to ambient pollution concentrations in southern England G. Taylor 1 M.C. Dobson 2 P.H. Free...

Ngày tải lên: 09/08/2014, 04:20