Responses of Root Nodule Formation and Nitrogen Fixation Activity to Nitrate in a Split-Root System in Peanut (Arachis hypogaea L.)

2001 ◽  
Vol 187 (2) ◽  
pp. 89-95 ◽  
Author(s):  
H. Daimon ◽  
M. Yoshioka
Keyword(s):  
Nitrogen Fixation ◽  
Root System ◽  
Arachis Hypogaea ◽  
Root Nodule ◽  
Nodule Formation ◽  
Nitrogen Fixation Activity ◽  
Split Root ◽  
Arachis Hypogaea L ◽  
Split Root System ◽  
Root Nodule Formation

scholarly journals Autoregulation of Root Nodule Formation: Signals of Both Symbiotic Partners Studied in a Split-Root System of Vicia sativa subsp. nigra

2002 ◽  
Vol 15 (4) ◽  
pp. 341-349 ◽  
Author(s):  
Anton A. N. van Brussel ◽  
Teun Tak ◽  
Kees J. M. Boot ◽  
Jan W. Kijne
Keyword(s):  
Rhizobium Leguminosarum ◽  
Root Nodule ◽  
Root Nodules ◽  
Nodule Formation ◽  
Vicia Sativa ◽  
Nod Factors ◽  
Split Root ◽  
Split Root System ◽  
Root Nodule Formation ◽  
Plant Signals

Inhibition of root nodule formation on leguminous plants by already induced or existing root nodules is called autoregulation of root nodule formation (AUT). Optimal conditions for AUT were determined using a split-root technique newly developed for Vicia sativa subsp. nigra. Infection of a root A with nodulating Rhizobium leguminosarum bv. viciae bacteria systemically inhibited nodulation of a spatially separated root B inoculated 2 days later with the same bacteria. This treatment gives complete AUT (total absence of nodules on root B). Only partial AUT of root B was obtained by incubation of root A with mitogenic nodulation (Nod) factors or with a noninfective strain producing normal mitogenic Nod factors. Nonmitogenic Nod factors did not evoke AUT. We identified two systemic plant signals induced by Rhizobium bacteria. Signal 1 (at weak buffering) was correlated with sink formation in root A and induced acidification of B-root medium. This signal is induced by treatment of root A with (i) nodulating rhizobia, (ii) mitogenic Nod factors, (iii) nonmitogenic Nod factors, or (iv) the cytokinin zeatin. Signal 2 (at strong buffering) could only be evoked by treatment with nodulating rhizobia or with mitogenic Nod factors. Most probably, this signal represents the specific AUT signal. Induction of complete AUT appears to require actively dividing nodule cells in nodule primordia, nodule meristems, or both of root A.

scholarly journals Fungicide application increased copper-bioavailability and impaired nitrogen fixation through reduced root nodule formation on alfalfa

Ecotoxicology ◽  
2019 ◽  
Vol 28 (6) ◽  
pp. 599-611 ◽  
Author(s):  
Martin Schneider ◽  
Katharina M. Keiblinger ◽  
Melanie Paumann ◽  
Gerhard Soja ◽  
Axel Mentler ◽  
...  
Keyword(s):  
Nitrogen Fixation ◽  
Root Nodule ◽  
Nodule Formation ◽  
Fungicide Application ◽  
Root Nodule Formation ◽  
Copper Bioavailability

Responses of soybean to ammonium and nitrate supplied in combination to the whole root system or separately in a split-root system

1994 ◽  
Vol 90 (2) ◽  
pp. 259-268 ◽  
Author(s):  
Sylvain Chaillou ◽  
James W. Rideout ◽  
C. David Raper, ◽  
Jean-Francois Morot-Gaudry
Keyword(s):  
Root System ◽  
Split Root ◽  
Split Root System

Comparison of the responses to NaCl stress of two pea cultivars using split-root system

2009 ◽  
Vol 123 (2) ◽  
pp. 164-169 ◽  
Author(s):  
Houneida Attia ◽  
Sarra Nouaili ◽  
Abdelaziz Soltani ◽  
Mokhtar Lachaâl
Keyword(s):  
Root System ◽  
Nacl Stress ◽  
Split Root ◽  
Split Root System

Biomass allocation in tomato (Lycopersicon esculentum) plants grown under partial rootzone drying: enhancement of root growth

2004 ◽  
Vol 31 (10) ◽  
pp. 971 ◽  
Author(s):  
Darren M. Mingo ◽  
Julian C. Theobald ◽  
Mark A. Bacon ◽  
William J. Davies ◽  
Ian C. Dodd
Keyword(s):  
Lycopersicon Esculentum ◽  
Root System ◽  
Biomass Allocation ◽  
Root Biomass ◽  
Leaf Water ◽  
Total Biomass ◽  
Split Root ◽  
Split Root System ◽  
Partial Rootzone Drying ◽  
And Control

Tomato (Lycopersicon esculentum Mill.) plants were grown in either a glasshouse (GH) or a controlled environment cabinet (CEC) to assess the effects of partial rootzone drying (PRD) on biomass allocation. Control and PRD plants received the same amounts of water. In control plants, water was equally distributed between two compartments of a split-root system. In PRD plants, only one compartment was watered while the other was allowed to dry. At the end of each drying cycle, wet and dry compartments were alternated. In the GH, total biomass did not differ between PRD and control plants after four cycles of PRD, but PRD increased root biomass by 55% as resources were partitioned away from shoot organs. In the CEC, leaf water potential did not differ between treatments at the end of either of two cycles of PRD, but stomatal conductance of PRD plants was 20% less at the end of the first cycle than at the beginning. After two cycles of PRD in the CEC, biomass did not differ between PRD and control plants, but PRD increased root biomass by 19% over the control plants. The promotion of root biomass in PRD plants was associated with the alternation of wet and dry compartments, with increased root biomass occurring in the re-watered compartment after previous exposure to soil drying. Promotion of root biomass in field-grown PRD plants may allow the root system to access resources (water and nutrients) that would otherwise be unavailable to control plants. This may contribute to the ability of PRD plants to maintain similar leaf water potentials to conventionally irrigated plants, even when smaller irrigation volumes are supplied.

scholarly journals Screening for Drought Tolerance through Root Morphology and Yield Characters of Groundnut (Arachis hypogaea L.) Genotypes

2021 ◽  
pp. 95-105
Author(s):  
K. Manoj Kumar ◽  
S. Vincent ◽  
A. Mothilal ◽  
M. Raveendran ◽  
R. Anandham ◽  
...  
Keyword(s):  
Drought Tolerance ◽  
Root System ◽  
Arachis Hypogaea ◽  
Block Design ◽  
Root Trait ◽  
Abiotic Factor ◽  
Worldwide Production ◽  
Arachis Hypogaea L ◽  
Drought Resistant ◽  
Yield Character

Drought affects the rainfed groundnut (Arachis hypogaea L.)  at different phases of development and it is the serious threats on groundnut productivity causing losses than any other abiotic factor under rainfed agriculture. In the world's semiarid regions, groundnut accounts for 90% of worldwide production. Drought mainly affects the pace and pattern of nutrient and water intake from the soil, affecting the architecture of the groundnut root system. Plant selections with desirable root trait have been a major focus in developing drought resistant Groundnut cultivars. In 2019, 60 groundnut genotypes were cultivated in root block design with two different soil water treatments, as well as in the field during the year under same circumstances. The purpose of this study was to see how different groundnut cultivars fared in terms of yield, yield contributing features, root characters, and their relationships with drought tolerance. Drought resistant genotypes had thicker roots, larger roots, and a deeper root system than susceptible genotypes. Recent series in groundnut genotypes of 60 numbers were sown during kharif 2019 (july-september) under rainfed condition (It includes life irrigation and rainfall received during cropping season). Groundnut genotypes were semi spreading with the duration of 110-120 days. Observation on root morphological character viz., roots length, root volume after 20 days of stress imposition of the crop and yield parameters were observed at the harvest. Among the 60 genotypes, 20 genotypes (VG 17008, VG 17046, VG 18005, VG 18102, VG 18077, VG 19572, VG 19709, VG 18111, VG19561, VG19576, VG 19620, VG 19681, VG 19688 etc.,) similarly, yield character were observed for 60 genotypes and all the genotypes given above recorded higher value in Total number of pods per plant, Number of double seeded pods per plant, Pod yield per plant, Harvest index and Total dry matter production. The methods used in this study identified correlation between yield character and root characters. Groundnut genotypes by assessing yield metrics and their relationship with root trait. These findings lay the groundwork for future study aimed at deciphering the molecular pathways underpinning Groundnut drought resistance.

Sign in / Sign up

Export Citation Format

Share Document