Genetic variation, heritability, and selection response to iron deficiency chlorosis in dry beans¹

Published as Paper No. 8264, Journal Series, Nebraska Agricultural Research Division, research conducted under Project 20–36.

Abstract

Forty dry bean (Phaseolus vulgaris L.) cultivars/lines were evaluated in 1986 for iron deficiency chlorosis on a highly calcareous soil. The cultivars/lines differed in severity of iron chlorosis and showed a continuous variation in symptoms ranging from highly resistant to susceptible. Some of the highly resistant cultivars/lines with no symptoms were Great Northern (G.N.) ‘Sapphire’, Pinto ‘UI 111’, A‐55, G.N. WMl‐85–46, and G.N. WMl‐86–40. Some of the most susceptible cultivars/lines were Pinto ‘Topaz’, Midnight, Navy‐'ExRico’, Dark Red Kidney ‘Montcalm’, and G.N. WMl‐85–48.

Eleven cultivars/lines previously screened for leaf iron deficiency chlorosis under field conditions on a calcareous soil in 1983 were tested in 1986. A genotype x environment interaction was noted between 1983 and 1986 tests.

Environment influenced considerably the range in expression of the chlorosis, particularly in the susceptible cultivars/lines. Moderately high estimates of realized heritability based on evaluation of F₃ families derived from the top 5% of resistant F₂ plants were obtained for the crosses G.N. ‘Valley’ x PI 165078 (0.52) and G.N. ‘Emerson’ x PI 165078 (0.49). Narrow‐sense heritability estimates based on regression of F₃ means on individual F₂ plants ranged from 0.29 to 0.75 for a wide array of 13 dry bean crosses.

Key words:

• Environmental variation
• Genotypic variation
• Narrow‐sense heritability
• Phaseolus vulgaris Realized heritability
• Vegetable breeding

Notes

Published as Paper No. 8264, Journal Series, Nebraska Agricultural Research Division, research conducted under Project 20–36.