Whole-plant nitrogen- and water-relations traits, and their associated trade-offs, in adjacent muskeg and upland boreal spruce species

Oecologia ◽  
1997 ◽  
Vol 110 (2) ◽  
pp. 160-168 ◽  
Author(s):  
T. B. Patterson ◽  
R. D. Guy ◽  
Q. L. Dang
Keyword(s):  
Water Relations ◽  
Plant Nitrogen ◽  
Trade Offs ◽  
Whole Plant

Systemic control of nodule formation by the plant N demand requires autoregulation dependent and independent mechanisms

2021 ◽  
Author(s):  
Marjorie Pervent ◽  
Ilana Lambert ◽  
Marc Tauzin ◽  
Alicia Karouani ◽  
Martha Nigg ◽  
...  
Keyword(s):  
Nitrogen Fixation ◽  
Nodule Formation ◽  
Atmospheric Nitrogen ◽  
Plant Nitrogen ◽  
Systemic Signaling ◽  
Systemic Control ◽  
Whole Plant ◽  
Strong Control ◽  
Mutant Genes ◽  
N Demand

Abstract In legumes interacting with rhizobia the formation of symbiotic organs involved in the acquisition of atmospheric nitrogen is depending of the plant nitrogen (N) demand. We used Medicago truncatula plants cultivated in split-root systems to discriminate between responses to local and systemic N signalings. We evidenced a strong control of nodule formation by systemic N-signaling but obtained no clear evidence of a local control by mineral nitrogen. Systemic signaling of the plant N demand controls numerous transcripts involved in the root transcriptome reprogramming associated to early rhizobia interaction and nodule formation. SUNN has an important role in this control but major systemic N signaling responses remained active in the sunn mutant. Genes involved in the activation of nitrogen fixation are regulated by systemic N signaling in the mutant, explaining why the hypernodulation phenotype is not associated to a higher nitrogen fixation of the whole plant. The control of the transcriptome reprogramming of nodule formation by systemic N signaling requires other pathway(s) that parallel the SUNN/CLE pathway.

scholarly journals Uncovering Trait Associations Resulting in Maximal Seed Yield in Winter and Spring Oilseed Rape

2021 ◽  
Vol 12 ◽  
Author(s):  
Laura Siles ◽  
Kirsty L. Hassall ◽  
Cristina Sanchis Gritsch ◽  
Peter J. Eastmond ◽  
Smita Kurup
Keyword(s):  
Oilseed Rape ◽  
Seed Yield ◽  
Complex Trait ◽  
Growth Conditions ◽  
Phenotypic Traits ◽  
Oilseed Crop ◽  
Crop Species ◽  
Trade Offs ◽  
Whole Plant ◽  
Plant Level

Seed yield is a complex trait for many crop species including oilseed rape (OSR) (Brassica napus), the second most important oilseed crop worldwide. Studies have focused on the contribution of distinct factors in seed yield such as environmental cues, agronomical practices, growth conditions, or specific phenotypic traits at the whole plant level, such as number of pods in a plant. However, how female reproductive traits contribute to whole plant level traits, and hence to seed yield, has been largely ignored. Here, we describe the combined contribution of 33 phenotypic traits within a B. napus diversity set population and their trade-offs at the whole plant and organ level, along with their interaction with plant level traits. Our results revealed that both Winter OSR (WOSR) and Spring OSR (SOSR); the two more economically important OSR groups in terms of oil production; share a common dominant reproductive strategy for seed yield. In this strategy, the main inflorescence is the principal source of seed yield, producing a good number of ovules, a large number of long pods with a concomitantly high number of seeds per pod. Moreover, we observed that WOSR opted for additional reproductive strategies than SOSR, presenting more plasticity to maximise seed yield. Overall, we conclude that OSR adopts a key strategy to ensure maximal seed yield and propose an ideal ideotype highlighting crucial phenotypic traits that could be potential targets for breeding.

scholarly journals Functional convergence in hydraulic architecture and water relations of tropical savanna trees: from leaf to whole plant

2004 ◽  
Vol 24 (8) ◽  
pp. 891-899 ◽  
Author(s):  
S. J. Bucci ◽  
G. Goldstein ◽  
F. C. Meinzer ◽  
F. G. Scholz ◽  
A. C. Franco ◽  
...  
Keyword(s):  
Water Relations ◽  
Tropical Savanna ◽  
Hydraulic Architecture ◽  
Functional Convergence ◽  
Whole Plant

scholarly journals Digital imaging approaches for phenotyping whole plant nitrogen and phosphorus response in Brachypodium distachyon

2014 ◽  
Vol 56 (8) ◽  
pp. 781-796 ◽  
Author(s):  
Richard Poiré ◽  
Vincent Chochois ◽  
Xavier R. R. Sirault ◽  
John P. Vogel ◽  
Michelle Watt ◽  
...  
Keyword(s):  
Digital Imaging ◽  
Brachypodium Distachyon ◽  
Nitrogen And Phosphorus ◽  
Plant Nitrogen ◽  
Phosphorus Response ◽  
Whole Plant

Symbiotic Nitrogen Fixation by Coralloid Roots of the Cycad Macrozamia riedlei: Physiological Characteristics and Ecological Significance

1976 ◽  
Vol 3 (3) ◽  
pp. 349 ◽  
Author(s):  
J Halliday ◽  
JS Pate
Keyword(s):  
Nitrogenase Activity ◽  
Natural Habitat ◽  
Natural Populations ◽  
Molar Ratio ◽  
Fixation Rate ◽  
Plant Nitrogen ◽  
Blue Green Algae ◽  
C2h2 Reduction ◽  
Whole Plant ◽  
Coralloid Roots

'Coralloid' roots containing blue-green algae occur commonly on the upper root stocks of M. riedlei in natural habitat in Western Australia. Each coralloid mass persists for several seasons; replacement sets form at irregular intervals, especially after fire. 15N2 and acetylene reduction assays demonstrate that coralloid roots fix nitrogen at physiologically significant rates. C2H2 reduction rates by coralloid roots are higher in winter than in summer. Performance is positively correlated with rainfall; soil temperature appears to be of lesser importance. Diurnal fluctuations in nitrogenase activity occur. Calibration using 15N2 gives a molar ratio of C2H2 reduced : N2 fixed of 5.8 : 1. The seasonal average of C2H2 reduction of 14.8 nmol per g fresh wt coralloid root per min is then equivalent to 37.6 g N per kg fresh wt per year, a fixation rate potentially capable of doubling coralloid root nitrogen once in every 8 weeks, and whole plant nitrogen every 8-11 years. Returns of fixed nitrogen in two natural populations of Macrozamia are estimated by compounding measurements of biomass of host and symbiotic organs with the seasonal average for coralloid fixation rate. The values obtained (18.8 and 18.6 kg N ha-1 year-1) indicate that Macrozamia contributes significantly to the nitrogen economy of its ecosystem.

scholarly journals Role of Methylotrophy During Symbiosis Between Methylobacterium nodulans and Crotalaria podocarpa

2005 ◽  
Vol 18 (10) ◽  
pp. 1061-1068 ◽  
Author(s):  
Philippe Jourand ◽  
Adeline Renier ◽  
Sylvie Rapior ◽  
Sergio Miana de Faria ◽  
Yves Prin ◽  
...  
Keyword(s):  
Root Nodule ◽  
Wild Type Strain ◽  
Plant Biomass ◽  
Root Nodules ◽  
Methylotrophic Bacterium ◽  
Plant Nitrogen ◽  
Affected Plant ◽  
Whole Plant ◽  
Fixation Capacity

Some rare leguminous plants of the genus Crotalaria are specifically nodulated by the methylotrophic bacterium Methylobacterium nodulans. In this study, the expression and role of bacterial methylotrophy were investigated during symbiosis between M. nodulans, strain ORS 2060T, and its host legume, Crotalaria podocarpa. Using lacZ fusion to the mxaF gene, we showed that the methylotroph genes are expressed in the root nodules, suggesting methylotrophic activity during symbiosis. In addition, loss of the bacterial methylotrophic function significantly affected plant development. Indeed, inoculation of M. nodulans nonmethylotroph mutants in C. podocarpa decreased the total root nodule number per plant up to 60%, decreased the whole-plant nitrogen fixation capacity up to 42%, and reduced the total dry plant biomass up to 46% compared with the wild-type strain. In contrast, inoculation of the legume C. podocarpa with nonmethylotrophic mutants complemented with functional mxa genes restored the symbiotic wild phenotype. These results demonstrate the key role of methylotrophy during symbiosis between M. nodulans and C. podocarpa.

Wolf plant effects on water relations, growth and productivity in crested wheatgrass

1994 ◽  
Vol 74 (4) ◽  
pp. 767-771 ◽  
Author(s):  
J. T. Romo
Keyword(s):  
Water Relations ◽  
Water Status ◽  
Reproductive Development ◽  
Grazing Management ◽  
Crested Wheatgrass ◽  
Whole Plant ◽  
Plant Effects ◽  
Management Techniques ◽  
Grazing Capacity

When improperly managed in pastures, crested wheatgrass (Agropyron desertorum (Fischer ex Link) Schultes) develops wolf plants because of the long-term persistence of inflorescences. The objective of this study was to test the hypothesis that the wolf plants have no effect on the growth and water relations of grazed or subordinate plants in crested wheatgrass. Treatments applied to wolf plants included killing with glyphosate, mowing to a 10-cm stubble, killing with glyphosate + mowing to a 10-cm stubble, and a control. Rates of vegetative and reproductive development, tiller and whole plant weights, tiller replacement and xylem water potentials of leaves were determined for subordinate plants for 2–3 yr following treatment. The presence of wolf plants had no consistent effect on the water relations or on growth of subordinate plants of crested wheatgrass. Because they play no apparent beneficial role in the water status and productivity of crested wheatgrass, management techniques should be implemented to exploit the forage produced by wolf plants. Accessing this forage can substantially increase the grazing capacity of crested wheatgrass pastures. Key words:Agropyron desertorum (Fischer ex Link) Schultes, grazing management, pasture improvement, plant water relations

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