Agenti patogeni

 

Mana cartofului reprezinta pentru intreaga lume una dintre cele mai distructive boli ale plantelor de cultura, cauzand culturii cartofului pierderi de bilioane de dolari in fiecare an.

Patogenul care o provoaca este Phytophthora infestans, determinand boala foliajului si a fructelor, la o serie de specii din Solanaceae , indeosebi la cartof si tomate.

Micotoxinele sunt metaboliti fungici, toxici, care adesea se gasesc in produsele agricole cauzand probleme de sanatate vertebratelor. Astfel de micotoxine sunt trichotecenele - sesquiterpene epoxidate produse de specii de Trichothecium, Fusarium, si Myrothecium si care actioneaza ca potentiali inhibitori ai sintezelor proteice la eucariote.

Printre speciile de Fusarium care produc astfel de trichotecene ce ataca o gama larga de specii de plante, sunt incluse: F. acuminatum, F. crookwellense, F. culmorum, F. equiseti, F.graminearum, F. lateritium, F. poae, F. sambucinum si F. sporotrichioides.

Micotoxinele joaca un rol important in manifestarea bolii, iar reducerea toxicitatii lor poate preveni sau reduce boala in planta, in special in seminte, atunci cand planta este o cereala. In fermele de animale dar si pentru om, micotoxicozele acute si cele cronice sunt asociate consumului de grau, secara, orz, orez si porumb, contaminate cu specii de Fusarium care produc micotoxine trichothecene.

Exista si o asociere intre anumite boli epidemice si consumul de seminte infectate cu specii de Fusarium, care produc trichothecene.

Comentarii:

YAzKRIYUrJlHZuE postat pe 24 Noiembrie 2012
JefeHeCbOf
Hello Everybody!The first camp of the Milvus Group organized at the Bosphorus, Turkey has come to an end. I was infemrod that due to the bad weather the team decided to start the journey home today evening. However, I was also infemrod that yesterday there was a gorgeous day with probably more than 40.000 raptors (there were definitely more birds counted than that, but after elimination of double counts the number can decrease). The final number of birds counted yesterday as well as the overall totals for the camp will be uploaded on this website during the first days of the next week. Milvus Group would like to thank everybody who participated for their time and financial efforts, please remember that this year the camp was organized on a completely voluntary basis. In the years to come we would also like to base the camp on voluntary work, but we will try to secure funding which will enable us to provide good working conditions for everybody.If you would like to join our team in 2009, and participate in the activities of our raptor migration count in one of the most important migration bottle-neck sites of Europe, please send us a message on the marton.kelemen(et)milvus[dot]ro email address. All the best,Marton