Sexual Differences in Biomass and Nutrient Allocation in the Dioecious Rubus Chamaemorus

Ecology ◽  
1988 ◽  
Vol 69 (4) ◽  
pp. 962-973 ◽  
Author(s):  
Jon Agren
Oecologia ◽  
1999 ◽  
Vol 118 (4) ◽  
pp. 453-460 ◽  
Author(s):  
Åsa M. Hemborg ◽  
P. Staffan Karlsson

Author(s):  
Arya K. Bal

In the course of studies in the root meristem tissue of Rubus chamaemorus L. some important changes in the ultrastructural morphology were observed during the initiation of senescence at the end of the growing season.Root meristems were collected from naturally growing healthy populations of Cloudberry plants, and fixed in Karnovsky's mixture or in 2.5% glutaraldehyde in phosphate buffer. The samples were osmicated, dehydrated following usual methods and embedded in Epon. Ultrathin sections were stained in uranyl acetate and lead citrate.Figure 1 shows part of a dense cell in the meristem. The electron density of these cells is due to large amounts of a particulate material in the cytoplasmic matrix. The smallest particle seen in electron micrographs is about 40 A, although larger aggregates are also found, which remain randomly distributed in association with various cell organelles. Dense substance has been found associated with golgi membranes, proplastids, vacuoles and microtubules (Fig. 2).


2019 ◽  
Vol 104 (11) ◽  
pp. 1740-1752
Author(s):  
Е. Ф. Марковская ◽  
Н. Ю. Шмакова ◽  
К. В. Морозова ◽  
О. В. Ермолаева
Keyword(s):  

2021 ◽  
Author(s):  
Marco Milella ◽  
Daniel Franklin ◽  
Maria Giovanna Belcastro ◽  
Andrea Cardini

Author(s):  
Riitta Puupponen-Pimiä ◽  
Liisa Nohynek ◽  
Jussi Suvanto ◽  
Juha-Pekka Salminen ◽  
Tuulikki Seppänen-Laakso ◽  
...  

Author(s):  
A. K. Whaley ◽  
A. O. Ponkratova ◽  
A. A. Orlova ◽  
E. B. Serebryakov ◽  
S. N. Smirnov ◽  
...  

2007 ◽  
Vol 53 (3) ◽  
pp. 230-234 ◽  
Author(s):  
Salvador Hernández-Martínez ◽  
Jaime G. Mayoral ◽  
Yiping Li ◽  
Fernando G. Noriega

1972 ◽  
Vol 50 (9) ◽  
pp. 1183-1188 ◽  
Author(s):  
M. Chen ◽  
G. Power

In samples taken monthly throughout the year the percentage of American smelt in Lake Ontario and Lake Erie containing cysts of Glugea hertwigi was 5.2% and 62.7% respectively. Sexual differences in incidence were observed, the significance of which was uncertain as results from the two lakes were contradictory.In male fish infection was almost entirely restricted to the digestive tract with few cysts in the liver, skin, and testes. In female fish the digestive tract and ovaries were similarly infected.Seasonal fluctuations in Glugea infection were obvious and seemed correlated with the gonadal cycle. In both sexes the highest parasite load corresponded with the onset of maturation.A striking difference in fecundity between the two smelt populations was attributed to the Glugea infection. In females parasite cysts replaced ovarian tissue, causing a reduction in the number of maturing eggs.


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