Helianthus petiolaris: Rhodes, L. & Maxted, N.

2013 ◽  
Author(s):  
Keyword(s):  
Helianthus Petiolaris

Hybrid Zones and the Genetic Architecture of a Barrier to Gene Flow Between Two Sunflower Species

Genetics ◽  
1999 ◽  
Vol 152 (2) ◽  
pp. 713-727 ◽  
Author(s):  
Loren H Rieseberg ◽  
Jeannette Whitton ◽  
Keith Gardner
Keyword(s):  
Genetic Study ◽  
Genetic Architecture ◽  
Chromosomal Rearrangements ◽  
Pollen Sterility ◽  
Model Organisms ◽  
Hybrid Zones ◽  
Reproductive Barriers ◽  
Natural Hybrid ◽  
Generation Times ◽  
Helianthus Petiolaris

Abstract Genetic analyses of reproductive barriers represent one of the few methods by which theories of speciation can be tested. However, genetic study is often restricted to model organisms that have short generation times and are easily propagated in the laboratory. Replicate hybrid zones with a diversity of recombinant genotypes of varying age offer increased resolution for genetic mapping experiments and expand the pool of organisms amenable to genetic study. Using 88 markers distributed across 17 chromosomes, we analyze the introgression of chromosomal segments of Helianthus petiolaris into H. annuus in three natural hybrid zones. Introgression was significantly reduced relative to neutral expectations for 26 chromosomal segments, suggesting that each segment contains one or more factors that contribute to isolation. Pollen sterility is significantly associated with 16 of these 26 segments, providing a straightforward explanation of why this subset of blocks is disadvantageous in hybrids. In addition, comparison of rates of introgression across colinear vs. rearranged chromosomes indicates that close to 50% of the barrier to introgression is due to chromosomal rearrangements. These results demonstrate the utility of hybrid zones for identifying factors contributing to isolation and verify the prediction of increased resolution relative to controlled crosses.

scholarly journals Phytostabilization of Polluted Military Soil Supported by Bioaugmentation with PGP-Trace Element Tolerant Bacteria Isolated from Helianthus petiolaris

Agronomy ◽  
2020 ◽  
Vol 10 (2) ◽  
pp. 204 ◽  
Author(s):  
Anabel Saran ◽  
Valeria Imperato ◽  
Lucia Fernandez ◽  
Panos Gkorezis ◽  
Jan d’Haen ◽  
...  
Keyword(s):  
Plant Growth ◽  
Trace Element ◽  
Animal Health ◽  
Environmental Pollutants ◽  
Polluted Soil ◽  
Plant Growth Promoting Bacteria ◽  
Bacterial Strains ◽  
Plant Parts ◽  
Trace Element Mobility ◽  
Helianthus Petiolaris

Lead (Pb) and cadmium (Cd) are major environmental pollutants, and the accumulation of these elements in soils and plants is of great concern in agricultural production due to their toxic effects on crop growth. Also, these elements can enter into the food chain and severely affect human and animal health. Bioaugmentation with plant growth-promoting bacteria (PGPB) can contribute to an environmentally friendly and effective remediation approach by improving plant survival and promoting element phytostabilization or extraction under such harsh conditions. We isolated and characterised Pb and Cd-tolerant root-associated bacteria from Helianthus petiolaris growing on a Pb/Cd polluted soil in order to compose inoculants that can promote plant growth and also ameliorate the phytostabilization or phytoextraction efficiency. One hundred and five trace element-tolerant rhizospheric and endophytic bacterial strains belonging to eight different genera were isolated from the aromatic plant species Helianthus petiolaris. Most of the strains showed multiple PGP-capabilities, ability to immobilise trace elements on their cell wall, and promotion of seed germination. Bacillus paramycoides ST9, Bacillus wiedmannii ST29, Bacillus proteolyticus ST89, Brevibacterium frigoritolerans ST30, Cellulosimicrobium cellulans ST54 and Methylobacterium sp. ST85 were selected to perform bioaugmentation assays in greenhouse microcosms. After 2 months, seedlings of sunflower (H. annuus) grown on polluted soil and inoculated with B. proteolyticus ST89 produced 40% more biomass compared to the non-inoculated control plants and accumulated 20 % less Pb and 40% less Cd in the aboveground plant parts. In contrast, B. paramycoides ST9 increased the bioaccumulation factor (BAF) of Pb three times and of Cd six times without inhibiting plant growth. Our results indicate that, depending on the strain, bioaugmentation with specific beneficial bacteria can improve plant growth and either reduce trace element mobility or enhance plant trace element uptake.

scholarly journals Phomopsis resistance on leaves and stems of Helianthus petiolaris

Helia ◽  
2007 ◽  
Vol 30 (47) ◽  
pp. 213-218
Author(s):  
C. Cáceres ◽  
F. Castaño ◽  
R. Rodríguez ◽  
A. Ridao ◽  
T. Salaberry ◽  
...  
Keyword(s):  
Helianthus Petiolaris

scholarly journals Inheritance of disc flower color in Helianthus petiolaris

Helia ◽  
2009 ◽  
Vol 32 (50) ◽  
pp. 51-58 ◽  
Author(s):  
A. Gutierrez ◽  
C. Delucchi ◽  
M. Poverene
Keyword(s):  
Flower Color ◽  
Disc Flower ◽  
Helianthus Petiolaris

Helianthus petiolaris

2012 ◽  
pp. 118-118
Author(s):  
Shakhnoza S. Azimova ◽  
Anna I. Glushenkova
Keyword(s):  
Helianthus Petiolaris

Persistence of sunflower crop traits and fitness in Helianthus petiolaris populations

Plant Biology ◽  
2011 ◽  
Vol 13 (5) ◽  
pp. 821-830 ◽  
Author(s):  
A. Gutierrez ◽  
M. Cantamutto ◽  
M. Poverene
Keyword(s):  
Sunflower Crop ◽  
Helianthus Petiolaris

Cold Stress Tolerance during Early Growth Stages of Naturalized Helianthus petiolaris Populations

Helia ◽  
2016 ◽  
Vol 39 (64) ◽  
pp. 21-43
Author(s):  
Agustina Gutierrez ◽  
Miguel Cantamutto ◽  
Monica Poverene
Keyword(s):  
Cold Stress ◽  
Low Temperatures ◽  
Genetic Resource ◽  
Recovery Period ◽  
Early Growth ◽  
Physiological Traits ◽  
Growth Stages ◽  
Glucose Content ◽  
Cold Tolerant ◽  
Helianthus Petiolaris

AbstractIn the last 10 years the sunflower crop area of Argentina has shifted towards the Southwest as a result of the expansion of soybean cultivation. Early sowings require greater tolerance to low temperatures in order to optimize the use of water resources by the crop, especially in the seedling stage, when cold stress limits growth and productivity. Helianthus petiolaris is a wild genetic resource that has contributed to the production of sunflower cultivars. The goal of this study was to evaluate the tolerance to low temperatures in H. petiolaris plants. Morphological traits (plant height, leaf width and leaf length) and physiological traits (electrolyte leakage, chlorophyll content, and glucose content) were compared in eight accessions having an early germination in the field and one with normal life cycle. Acclimated and non-acclimated plants were subjected to cold stress followed by a recovery period. Physiological traits during early growth stages showed differences in cold tolerance and for acclimation ability between accessions, suggesting the existence of heritable components. Four accessions were the most cold-tolerant among the studied populations, suggesting a natural adaptation related to the geographical site. Results point out that H. petiolaris is a useful genetic resource to contribute to sunflower breeding in the search of cold tolerant cultivars.

HETEROSIS IN TOP-CROSS HYBRIDS OF DIVERSE CYTOSTERILE SOURCES OF SUNFLOWER (Helianthus annuus L.) / HETEROSIS EN LOS HIBRIDOS TOP-CROSS DEL GIRASOL CREADOS DE DIVERSAS FUENTES CITOESTERILES / HÉTEROSIS DANS LES HYBRIDES TOP-CROSS DE TOURNESOL (Helianthus annuus L.) OBTENUS DE DIVERSES SOURCES CYTOSTÉRILES

Helia ◽  
2001 ◽  
Vol 24 (34) ◽  
pp. 25-34
Author(s):  
M.P. Rajanna ◽  
A. Seetharam ◽  
K. Virupakshappa ◽  
S. Ramesh
Keyword(s):  
Helianthus Annuus ◽  
Quantitative Traits ◽  
Oil Content ◽  
The Other ◽  
Male Sterile ◽  
Breeding Programs ◽  
Helianthus Annuus L ◽  
Standard Heterosis ◽  
Helianthus Petiolaris ◽  
Heterosis Breeding

SUMMARY Standard heterosis was estimated for eight quantitative traits in top-cross hybrids of three diverse cytoplasmic male sterile (CMS) sources of sunflower viz., Helianthus petiolaris (CMS-PET1), Helianthus petiolaris ssp. fallax (CMS-PEF1) and Helianthus annuus ssp. lenticularis (CMS-ANL2) maintained under different nuclear backgrounds. The top-cross hybrids were derived by crossing the above three CMS sources with 12 male parents in a line x tester design. Significant heterosis over two standard checks in the desirable direction was observed for all traits. All three sources under study advanced the maturity in most of the hybrids. CMS-PET1 was found to be the best compared with the other sources as far as oil content was concerned. Mean performance of the hybrids for achene yield and other economically important characteristics indicated that the hybrids derived in the cytoplasmic background of CMSANL2 were the best followed by CMS-PET1 and CMS-PEF1 suggesting that CMS diversification in heterosis breeding programs would be rewarding in sunflower.

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