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Nematode resistance and meiotic abnormality in diploid sugar beet selected from interspecific beta vulgaris x beta procumbens hybrids



Nematode resistance and meiotic abnormality in diploid sugar beet selected from interspecific beta vulgaris x beta procumbens hybrids



Plant Breeding 100(1): 41-53



Two nematode-resistant (Heterodera schachtii) trisomic lines which were derived from interspecific Beta vulgaris .times. B. procumbens hybrids were intercrossed or backcrossed with susceptible diploid sugar beet and their progenies were screened for nematode resistance. The transmission rate of resistance varied from 1.5% to 47.6% with an average of 20.4% in the progenies of individual trisomics derived from the trisomic lines. Eleven resistant diploids were selected with a frequency of 0.2%. These resistant diploids were classified into two groups, i.e., one group showed relatively high transmission rates of resistance with an average of 25.4% and the other extremely low with an average of 1.2% in their backcrossed and selfed progenies. Meiotic chromosome behavior in a resistant diploid group with high transmission rate was considerably normal as compared to that in a resistant diploid group with low transmission rates. Chromatid bridges and acentric fragments were detected in 93% of resistant diploids and in 46% of susceptible diploids. Two different sized fragment occurred in resistant diploids, while only a smaller fragment was present in susceptible diploids. A frequency of sporocytes with bridges-fragments was 17.4% at anaphase I and 13.9% at anaphase II in resistant diploids, while in susceptible diploids a frequency was 2.9% and 5.3% at the respective stages. These results suggest that at least two paracentric inversions are present in resistant diploids, one of which is linked to nematode resistance and may be responsible for the low transmission rate of resistance.

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Related references

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