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Title: INHERITANCE OF RESISTANCE TO FUSARIUM TUBER ROT IN POTATOES

Author
item VALLURU, RAMANJULU - PENN STATE
item CHRIST, BARBARA - PENN STATE
item Haynes, Kathleen

Submitted to: Potato Association of America Proceedings
Publication Type: Abstract Only
Publication Acceptance Date: 4/4/2003
Publication Date: 1/4/2004
Citation: Valluru, R., Christ, B.J., Haynes, K.G. 2004. Inheritance of resistance to Fusarium tuber rot in potatoes [abstract]. American Journal of Potato Research. 81:93 .

Interpretive Summary:

Technical Abstract: FUSARIUM TUBER ROT OF POTATO IS ONE OF THE MOST ECONOMICALLY IMPORTATNT DISEASES OF STORED POTATOES. THE OBJECTIVE OF THIS STUDY WAS TO DETERMINE THE INHERITANCE OF RESISTANCE TO FUSARIUM TUBER ROT. A HIGHLY RESISTANT (B0172-22) AND A HIGHLY SUSCEPTIBLE (B0178-34) POTATO CLONE WERE CROSSED AS FEMALE PARENTS WITH TWO MALE PARENTS. TUBERS FROM VARYING NUMBERS OF PROGENY (28-37) FROM THESE FOUR CROSSES WERE INOCULATED WITH FUSARIUM SAMBUCINUM IN THE LABORATORY. THREE TUBERS FROM EACH PROGENY WERE INOCULATED AT APPROXIMATELY MONTHLY INTERVALS SIX TIMES IN EACH OF TWO YEARS. THE DEPT AND THE DIAMETER OF THE LESION WERE MEASURED 40 DAYS AFTER INCOULATION. ESTIMATES OF BROAD-SENSE HERITABILITY FOR LESION DEPTH AND A 95% CONFIDENCE INTERVAL ABOUT THESE ESTIMATES WERE SIMILAR IN 2000 AND 2001: 0.84 (0.84,0.91) AND 0.77 (0.77,0.87), RESPECTIVELY, AS WERE THE ESTIMATES FOR LESION DIAMETER: 0.83 (0.83,0.90) AND 0.80 (0.80,0.89), RESPECTIVELY. GENERAL COMBINING ABILITY FOR LESION DEPTH FOR THE FEMALE PARENTS WAS SIGNIFICANT IN 2001, BUT NOT IN 2000. GENERAL COMBINING ABILITY FOR LESION DIAMETER FOR THE FEMALE PARENTS AND THE MALE PARENTS WAS SIGNIFICANT BOTH YEARS. THERE WAS NO SPECIFIC COMBINING ABILITY FOR EITHER LESION DEPTH OR LESION DIAMETER. THERE WERE SIGNIFICANT DIFFERENCES AMONG CLONES IN EACH OF THESE FOUR FAMILIES FOR BOTH TRAITS BOTH YEARS. THESE RESULTS INDICATE THAT RESISTANCE TO FUSARIUM DRY ROT IS A HERITABLE TRAIT WITH A SUBSTANTIAL ADDITIVE GENETIC COMPONENT. THEY ALSO INDICATE LESION DIAMETER IS MORE INFORMATIVE FOR EVALUATING RESISTANCE THAN LESION DEPTH. (POSTER, BREEDING)