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Zbornik - Društvo genetičara Srbije

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90 ZBORNIK ABSTRAKATA III KONGRESA GENETIÈARA SRBIJE IV-Usm-1<br />

Subotica, 30. novembar - 4. decembar 2004.<br />

UTICAJ TIPA OTPORNOSTI PREMA RIZOMANIJI NA<br />

KVALITATIVNA SVOJSTVA ŠEÆERNE REPE<br />

L. Kovaèev, Sneana Mezei, N. Èaèiæ i Nevena Nagl<br />

Nauèni institut za ratarstvo i povrtarstvo, Novi Sad<br />

Rizomanija je u svetskim razmerama jedno od najdestruktivnijih oboljenja šeæerne repe<br />

koje je do sada ustanovljeno i opisano. Obolenje izaziva virus nekrotiènog utila nerava<br />

šeæerne repe (BNYVV), a prenosi ga parazitna gljiva Polymixa betae. Da bi se postigla<br />

visoka i stabilna proizvodnja šeæerne repe novi genotipovi pored dobrih kvantitativnih<br />

svojstava (prinos korena, sadraj šeæera i nešeæera) treba da poseduju tolerantnost ili<br />

otpornost prema Rizomaniji. Pet razlièitih tipova tolerantnosti – otpornosti (Alba, Rizor,<br />

Holly, WB42 i Beta maritima) korišteni su kao donori gena u procesu povratnog<br />

ukrštanja sa domaæom osetljivom populacijom NS-56 2n MM. Razlièiti izvori otpornosti<br />

prema Rizomaniji, posle pet povratnih ukršanja, kod near-isogenic populacija uske<br />

genetièke osnove, nisu znaèajno uticali na njihove najvanije kvantitativne osobine. Ovo<br />

ukazuje da geni koji odreðuju tolerantnost-otpornost nisu povezani sa genima koji su<br />

odgovorni za ispoljavanje najvanijih kvantitativnih svojstava šeæernere repe.<br />

SUGAR BEET QUALITATIVE TRAITS AS AFFECTED<br />

BY TYPE OF RESISTANCE TO RHIZOMANIA<br />

Rhizomania is globally one of the most destructive sugar beet diseases ever recorded and<br />

described. The disease is caused by the beet necrotic yellow vein virus (BNYVV) and is<br />

transmitted by the parasitic fungus Polymixa betae. For high and stable sugar beet production,<br />

it is necessary for new genotypes of this species to have good quantitative traits<br />

(root yield, sugar content, levels of nonsugars) as well as tolerance or resistance to<br />

rhizomania. Five different types of tolerance/resistance to this disease (Alba, Rizor,<br />

Holly, WB42 and Beta maritima) were used as gene donors in the process of backcrossing<br />

with the susceptible domestic population NS-56 2n MM. After five backcrosses, the<br />

different resistance types had no significant effect on the major quantitative traits of<br />

near-isogenic lines with a narrow genetic base. This indicates that genes controlling this<br />

tolerance/resistance are not linked with genes that are responsible for the expression of<br />

major quantitative traits in sugar beet.

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