206 research outputs found
Physical Mapping of Micronutritional Genes in Wheat-rye Translocations
In rye (Secale cereale L.), there are loci on chromosome arm 5RL which give rise to increased copper (Cu)- and iron (Fe)-efficiency, respectively. Four different wheat-rye translocations each harboring a terminal segment of different size of the rye chromosome arm 5RL were identified by test crosses and Giemsa-banding: \u27T29\u27 (5AS.5RL), \u27T63\u27 (5BS.5BL-5RL), \u27Vhn\u27 (4BS.4BL-5RL) and \u27Cor\u27 (4BS.4BL-5RL). The translocation break points were detected by chromosome painting technique GISH and the sizes of the rye chromosome segments involved were determined by computer image analysis. The Cu-efficiency gene Ce was physically mapped to the terminal region of 5RL, and the genes for mugineic acid and for hydroxymugineic acid synthetases involved in the strategy II of Fe-efficiency control to two intercalary regions of 5RL. In all wheat-rye translocation lines the Ce gene is linked to the dominant hairy neck character (HaI) from rye. This morphological trait and the RFLP probe \u27WG 199\u27 as well can serve as proper markers for a marker-based large-scale selection in wheat breeding
Einfluss unterschiedlicher Inokulationstiefen mit dem arbuskulÀren Mykorrhizapilz Glomus mosseae auf die Mykorrhizierung bei Reben (Vitis sp.) in WurzelbeobachtungskÀsten
In einem GefĂ€Ăversuch mit GrĂŒnstecklingen der Unterlagssorte SO 4 (Vitis berlandieri x Vitis riparia) wurde der Einfluss einer unterschiedlichen Bandinokulation mit dem AM-Pilz Glomus mosseae (Nicol. et Gerd.) Gerdemann et Trappe auf die Entwicklung des Pilzes innerhalb des Wurzelsystems untersucht. Hierbei wurde in 70 cm tiefe WurzelbeobachtungskĂ€sten mit einem P-armen, sterilisierten Rebschulboden in eine Tiefe von 9-18 cm bzw. 36-45 cm eine 9 cm dicke Inokulationsschicht eingebracht. Im unmittelbaren Inokulationsbereich war bei beiden Inokulationsvarianten mit 45 bzw. 35% der AM-Infektionsgrad am höchsten. Mit zunehmendem Abstand vom Inokulationsband waren die Rebwurzeln geringer mykorrhiziert bzw. es konnte keine AM-Infektion festgestellt werden. Durch die Inokulation im oberen Bodenbereich wurden Trockengewicht und P-Gehalt der SO 4-Stecklinge erhöht. Die Zn-Gehalte in den Blattspreiten waren bei beiden Inokulationsmethoden erhöht, der Cu-Gehalt bei Inokulation des unteren Bodenbereichs. Bereits eine Teilbesiedlung des Wurzelsystems mit AM fĂŒhrte zu ausreichenden Inokulationserfolgen in Form von erhöhten NĂ€hrstoffgehalten in den BlĂ€ttern und erhöhter Trockensubstanzbildung. Die Inokulation in der gröĂeren Bodentiefe (36-45 cm) fĂŒhrte zu einer verzögerten Mykorrhizierung der Wurzeln, so dass möglicherweise die positiven Effekte des AM-Pilzes bei dieser Inokulationsmethode nicht zum Tragen kamen.Influence of different inoculum places of the mycorrhizal fungus Glomus mosseae on mycorrhizal colonization in grapevine rootstocks (Vitis sp.)Grapevine rootstocks (Vitis berlandieri x Vitis riparia, cv. SO 4) were grown in pots with sterilised soil with low P level from a nursery to test the effect of a local supply of inoculum of an arbuscular mycorrhizal fungus (Glomus mosseae [Nicol. et Gerd.] Gerdemann et Trappe) on mycorrhizal colonization of the root system. The inoculum was placed in a 9-cm deep band either in 9-18 cm or in 36-45 cm soil depths. After 6 weeks of growth, mycorrhizal colonisation of roots was highest in the inoculated soil zone. With increasing distance from the inoculum band, mycorrhizal colonization decreased or was absent. When the inoculum was placed in the top soil, the shoot dry weight and the leaf blade Zn and P concentrations significantly increased in mycorrhizal as compared to nonmycorrhizal plants. When the inoculum was placed in 36-45 cm soil depth, leaf blade Zn and Cu concentrations increased in mycorrhizal plants, but shoot dry weight was not affected. In conclusion, a locally restricted mycorrhizal colonization of the root system was sufficient to increase growth and nutrient uptake of grape rootstocks
Response of Epidendrum Ibaguense (orchidaceae) to the application of lime rates to the pot
Clorose férrica induzida pelo calcårio
Iron chlorosis is one of the most common and difficult to control problems in crops grown on calcareous soils.
In alkaline soils, which represent one third of the Earth surface, the bicarbonate ion prevails and is a major induction
factor of iron chlorosis. As a result, alkalinity limits Fe bioavailability in the soil solution, Fe reduction and
assimilation, as well as transport and uptake within the plant. Due to this nutritional imbalance, plants develop
different response strategies which are not entirely successful on calcareous soils. In consequence, yield, fruit
quality and harvesting season are negatively affected. Preventing and treating iron chlorosis is highly costly, but is
inevitable, in order to ensure crop sustainability in regions where soil calcium carbonate and aridity are limiting
factors. In this work, we present a short overview of Fe dynamics in calcareous soils and its influence on crop
productivit
Teores de nutrientes e qualidade fisiolĂłgica de sementes de feijĂŁo em resposta Ă adubação foliar com manganĂȘs e zinco
Efeito do pH do solo rizosfĂ©rico e nĂŁo rizosfĂ©rico de plantas de soja inoculadas com Bradyrhizobium japonicum na absorção de boro, cobre, ferro, manganĂȘs e zinco
Bioavailability of phosphorus, other nutrients and potentially toxic elements from marginal biomass-derived biochar assessed in barley ( Hordeum vulgare ) growth experiments
Irrigação e adubação potåssica via fertirrigação em bananeira 'willians': produção e qualidade de frutos
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