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Resistance Evaluation and Inheritance of a Nonchlorotic Response to Brown Spot of Soybean 1
Author(s) -
Young L. D.,
Ross J. P.
Publication year - 1978
Publication title -
crop science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.76
H-Index - 147
eISSN - 1435-0653
pISSN - 0011-183X
DOI - 10.2135/cropsci1978.0011183x001800060043x
Subject(s) - biology , leaf spot , seedling , inoculation , cultivar , septoria , spots , botany , horticulture , lesion , point of delivery , conidium , backcrossing , gene , genetics , psychology , psychiatry
Soybean ( Glycine max (L.) Merr.) plant introductions and cultivars adapted for maturity an North Carolina were screened for resistance to brown spot, caused by septoria glycines Hemmi . Neither immunity nor high levels of resistance were found in the 626 lines tested in the seedling stage in the greenhouse and near full. pod stage in the field. Six lines did not develop the characteristic chlorotic halo around necrotic lesions. Symptoms on these lines when inoculated with fungal conidia were limited to black lesions 1 to 2 mm in diam and small areas of dead tissue. Segregation of F 2 progenies from two crosses of chlorotic‐lesion parent ✕ nonchloroticlesion parent fit the ratio of 15 chlorotic‐lesion plants: 1 nonchlorotic‐lesion plant. The F 3 families segregated 15 chlorotic‐lesion families: 1 nonchlorotic‐olesion families when the classes of all chlorotic‐lesion families and segre. gating families were combined. All plants with nonchlorotic lesions had green cotyledons in the seed. It was concluded that the genes controlling the nonchloroticlesion response were either identical to those controlling chlorophyll retention in cotyledons in the seed or were closely linked to the chlorophyll retention genes.