Reference Report for IND79003472
| Title: | Resistance evaluation and inheritance of a nonchlorotic response to brown spot Septoria glycines of soybean. |
| Authors: | Young, L.D., Ross, J.P. |
| Source: | Crop Sci. 1978, 18(6):1075-1077 |
| Abstract: | In screenings against Septoria glycines, neither immunity nor high levels of resistance were found in the 626 lines tested in the seedling stage in the glasshouse or near full-pod in the field. Six lines did not develop the characteristic chlorotic halo around necrotic lesions; symptoms on these, when inoculated with conidia, were limited to black lesions (1-2 mm diam.) and small areas of dead tissue. Segregation of F2 progenies from 2 crosses of chlorotic-lesion X nonchlorotic-lesion parents fitted the ratio of 15 chlorotic:1 nonchlorotic lesion plant. The F3 families segregated into 15 chlorotic:1 nonchlorotic lesion family, when the classes of all chlorotic-lesion families and segregating families were combined. All plants with nonchlorotic lesions had green cotyledons in the seed. It was concluded that the genes controlling the nonchlorotic lesion response were either identical to those controlling chlorophyll retention in the cotyledons in the seed or were closely linked to them.ADDITIONAL ABSTRACT:Of 626 lines from maturity groups V to VII evaluated at Raleigh in 1976, eight with green cotyledons exhibited resistance to Septoria glycines at the seedling stage, with a nonchlorotic lesion similar to that known for PI79609. PI79609 was crossed as the female parent with Essex and Virginia. The F2 and F3 progenies fitted the ratio of 15 susceptible (chlorotic) to 1 resistant (nonchlorotic) progeny, indicating control by two recessive genes. All resistant progenies had green cotyledons. It is concluded that the genes controlling the nonchlorotic response were the same as or closely linked to those controlling chlorophyll retention in cotyledons in the seed |
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