scholarly journals Lotus glaber Mill. Induced autotetraploid: new forage resource for the Flooding Pampas

2007 ◽  
Author(s):  
M. Barufaldi ◽  
Y. Villacampa ◽  
P. Sastre-Vázquez ◽  
F. García-Alonso ◽  
J. A. Reyes
Keyword(s):  
Lotus Glaber

Phenotypic plasticity with respect to salt stress response by Lotus glaber: the role of its AM fungal and rhizobial symbionts

Mycorrhiza ◽  
2008 ◽  
Vol 18 (6-7) ◽  
pp. 317-329 ◽  
Author(s):  
Mariela Echeverria ◽  
Agustina Azul Scambato ◽  
Analía Inés Sannazzaro ◽  
Santiago Maiale ◽  
Oscar Adolfo Ruiz ◽  
...  
Keyword(s):  
Salt Stress ◽  
Stress Response ◽  
Phenotypic Plasticity ◽  
Salt Stress Response ◽  
Lotus Glaber

Flooding tolerance in five populations of Lotus glaber Mill. (Syn. Lotus tenuis Waldst. et. Kit.)

1999 ◽  
Vol 50 (4) ◽  
pp. 555 ◽  
Author(s):  
O. R. Vignolio ◽  
O. N. Fernández ◽  
N. O. Maceira
Keyword(s):  
Low Temperatures ◽  
Root Biomass ◽  
Adventitious Roots ◽  
Positive Relationship ◽  
Flooding Tolerance ◽  
Ecological Studies ◽  
Flooding Pampa ◽  
Morphological Adaptations ◽  
Stem Leaf ◽  
Lotus Glaber

Lotus glaber Mill. is a herbaceous legume, tolerant to flooding, that in a few decades has colonised the Flooding Pampa grasslands, an extensive wetland of 90 000 km in central-east Argentina. In this study, the growth and nodulation of flooded plants in 5 local populations were evaluated. Thirty-day-old seedlings, grown in pots, were flooded outdoors during 4 months. Stem, leaf, and root biomass, as well as the number of nodules per plant, were lower in flooded plants than in non-flooded ones. In flooded plants, the submerged portions of stems were hypertrophied and populations differed in the proportion of plants with adventitious roots. Flood tolerance was significantly related to the proportion of plants with adventitious roots in stems of each population. A positive relationship was shown between the proportion of plants with adventitious root and number of nodules per plant. The plants were also tolerant of low temperatures and ice-sheeting of water. These results underline the importance of morphological adaptations related to the maintenance of plant functionality under flooding conditions. The results provide evidence of the existence of characters related to flooding tolerance, which should be taken into account in ecological studies and agronomic selection programs

Physiological and Anatomical Basis of Differential Tolerance to Soil Flooding of Lotus corniculatus L. and Lotus glaber Mill

2005 ◽  
Vol 276 (1-2) ◽  
pp. 301-311 ◽  
Author(s):  
Gustavo G. Striker ◽  
Pedro Insausti ◽  
Agustín A. Grimoldi ◽  
Edmundo L. Ploschuk ◽  
Viviana Vasellati
Keyword(s):  
Lotus Corniculatus ◽  
Soil Flooding ◽  
Anatomical Basis ◽  
Lotus Glaber

Biomass allocation to vegetative and reproductive organs in Lotus glaber and L. corniculatus (Fabaceae)

2002 ◽  
Vol 50 (1) ◽  
pp. 75 ◽  
Author(s):  
O. R. Vignolio ◽  
O. N. Fernández ◽  
N. O. Maceira
Keyword(s):  
Biomass Allocation ◽  
Reproductive Output ◽  
Specific Weight ◽  
Growth Conditions ◽  
Reproductive Organs ◽  
Reproductive Season ◽  
Lower Weight ◽  
Reproductive Biomass ◽  
Pod Length ◽  
Lotus Glaber

Comparative studies on reproductive and vegetative attributes between Lotus glaber Mill. and L. corniculatus L. showed that under identical growth conditions seed and pod production were higher in L. glaber than in L. corniculatus. The objective of this work was to determine whether differences in reproductive output between L. glaber and L. corniculatus are related to differences in biomass allocation and whether they can be related to the habitats of each species. We compared, in two studies, the allocation of vegetative and reproductive biomass of both species' growth in pots outdoors. The shoot to root ratio was higher in L. glaber than in L. corniculatus. Both species allocated the same biomass to stems but L. corniculatus produced fewer reproductive stems of higher specific weight. The number of pods per umbel and seeds per pod did not differ between species, but the total number of umbels, pods and seeds per plant were higher in L. glaber than in L. corniculatus. Weight per pod was higher in L. corniculatus than in L. glaber. The reproductive biomass in L. glaber was distributed in a higher number of pods and seeds that were of lower weight than in L. corniculatus. In both species, pod length and seed number per pod showed a decreasing trend during the reproductive season and both attributes were positively correlated. Some of the differences reported in reproductive and vegetative attributes are consistent with the conditions of habitat where each species grows. The results are discussed in relation to the agronomic values of these species and the factors determining their persistence and distribution in the grassland.

Modulation of polyamine balance in Lotus glaber by salinity and arbuscular mycorrhiza

2007 ◽  
Vol 45 (1) ◽  
pp. 39-46 ◽  
Author(s):  
Analía I. Sannazzaro ◽  
Mariela Echeverría ◽  
Edgardo O. Albertó ◽  
Oscar A. Ruiz ◽  
Ana B. Menéndez
Keyword(s):  
Arbuscular Mycorrhiza ◽  
Lotus Glaber

Do polyamines modulate the Lotus glaber NADPH oxidation activity induced by the herbicide methyl viologen?

2004 ◽  
Vol 31 (9) ◽  
pp. 921 ◽  
Author(s):  
Juan C. Cuevas ◽  
Diego H. Sánchez ◽  
María Marina ◽  
Oscar A. Ruiz
Keyword(s):  
Oxidative Stress ◽  
Methyl Viologen ◽  
Chilling Stress ◽  
Polyamine Metabolism ◽  
Oxidation Activity ◽  
Polyamine Content ◽  
Nadph Oxidation ◽  
Lotus Glaber

In recent years, there has been a growing interest in NADPH-oxidases which are involved in the active generation of reactive oxygen species (ROS), owing to their role in oxidative burst, signalling and oxidative damage derived from biotic and abiotic stresses. NADPH oxidase activity is enhanced by some environmental cues, such as zinc deficiency and chilling stress, where zinc and polyamines have been suggested to be involved in the modulation of ROS generation. In order to further characterise NADPH oxidation activity during oxidative stress we exposed Lotus glaber Mill. (narrow-leaf trefoil; syn. L. tenuis Waldst. et Kit. ex Wild var. Miller) plants to the herbicide methyl viologen (MV) and evaluated zinc and polyamines as oxidative stress regulatory compounds. For this purpose we conducted in vitro and in vivo experiments, observing that zinc and the higher polyamines spermidine and spermine inhibited the NADPH oxidation activity in vitro while preventing methyl viologen-induced superoxide production in vivo. It is suggested that these substances act through a direct effect on flavin oxidases. However, it was not possible to correlate free polyamine content of L. glaber with their hypothetical inhibitory role during oxidative stress, probably owing to the plant’s natural tolerance to the herbicide tested. Therefore, tobacco, a more sensitive species, was tested for methyl viologen toxicity. High concentrations of methyl viologen induced free polyamine levels in crude extracts and intercellular fluids. However, only free polyamine content in the intercellular fluids was increased in plants treated with low methyl viologen concentrations. These results support the notion that polyamine metabolism in the apoplast is involved in the physiological response to oxidative stress.

scholarly journals Pollen Resources Stored in Nests of Wild Bees Xylocopa ciliata Burmeister and Megachile pusilla Pérez (Hymenoptera: Anthophila) in a Temperate Grassland-Forest Matrix

Sociobiology ◽  
2018 ◽  
Vol 65 (4) ◽  
pp. 784
Author(s):  
Favio Gerardo Vossler
Keyword(s):  
Pollen Analysis ◽  
Diet Composition ◽  
New World ◽  
Temperate Grassland ◽  
Wild Bees ◽  
Three Samples ◽  
Pollen Types ◽  
Pollen Preference ◽  
Origin Area ◽  
Lotus Glaber

Pollen analysis was employed to study the diet composition of two wild bees in a patch of temperate grassland invaded by exotic plants. Thirty pollen types from 14 families and two unidentified types were present in the seven samples analyzed. The three samples from Megachile pusilla Pérez were composed of 100% Lotus glaber and the four samples from Xylocopa ciliata Burmeister of abundant pollen (˃5%) of Lotus glaber, Galega offi cinalis, Adesmia bicolor and type Senna-Chamaecrista (all Fabaceae). The latter resource likely foraged out of the park, which could be an evidence to support its pollen preference for Fabaceae. However, a larger number of samples is necessary to identify the specialization status of X. ciliata. The preference for Lotus in this site was due to temporal specialization as M. pusilla was identified as polylectic in its origin area, and this could help to explain its eff ective naturalization in the New World and other areas of the Old World.

scholarly journals Rizóbios nativos do Rio Grande do Sul simbioticamente eficientes em Lotus glaber

2011 ◽  
Vol 41 (3) ◽  
pp. 440-446 ◽  
Author(s):  
Ricardo de Albuquerque Fontoura ◽  
Márcio Leandro dos Santos Frizzo ◽  
Enilson Luiz Saccol de Sá ◽  
Benjamin Dias Osório Filho ◽  
Brenda Cristye Tonon ◽  
...  
Keyword(s):  
Rio Grande ◽  
Rio Grande Do Sul ◽  
Lotus Glaber

As leguminosas forrageiras, além de contribuírem para o aumento da oferta de forragem com alto teor de proteína, também são importantes como cobertura vegetal de solos. Entre as leguminosas com grande potencial forrageiro, espécies do gênero Lotus têm se destacado. Este trabalho visou à seleção de rizóbios nativos eficientes em Lotus glaber a partir de amostras de solo de cinco localidades do Rio Grande do Sul. Obtiveram-se 259 isolados de rizóbios, que foram avaliados quanto à morfologia colonial e produção de melanina. Destes, 15 isolados foram selecionados para avaliação da eficiência na fixação simbiótica de nitrogênio em experimento em casa de vegetação e caracterizados geneticamente por comparação do perfil eletroforético dos produtos de amplificação do DNA genômico, por PCR com os oligonucleotídeos iniciadores BOX e ERIC. Apenas cinco isolados produziram melanina. Nove isolados foram mais eficientes do que a estirpe SEMIA 830, que é autorizada para a produção de inoculante para L. glaber no país. Na caracterização genética, observou-se que nenhum isolado apresentou identidade com as estirpes recomendadas, o que demonstra que, nos solos do Rio Grande do Sul, existem rizóbios autóctones eficientes na fixação simbiótica de nitrogênio com L. glaber, podendo ser recomendados para estudos a campo, visando a uma futura produção de inoculantes para estas leguminosas no Brasil.

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