The expression and inheritance of a leaf distortion in the common bean Phaseolus vulgaris L. Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/xk81jp55j

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  • The expression and inheritance of a leaf distortion of beans was studied in a group of the Oregon State University breeding lines and a commercial cultivar. Of seven parents involved, two were without distortion and classified normal, and the remainder were affected by various degrees of distortion. The distortion affected only the trifoliolate leaves and never appeared on the primary leaves. It consisted in a clearing of the leaf area between the veins. The clear region appeared to be a zone of slower growth compared to the normal region,, The veins became distorted and the resulting leaf had an abnormal shape. Variations of the distortion were observed within and among lines. Distorted lines were intercrossed and crossed with normal lines. Genetic data were obtained in the field and greenhouse as scores, using a 0 - 5 system where 0 indicated no distortion and 5 severe distortion. The scores of parental lines, the F₁, F₂ and backcross generations provided the base for interpretation of genetic ratios and calculation of heritability estimates. Reciprocal differences were observed in a cross between a severe and a mild parent. This cross could not be used for inheritance study and estimation of heritability as computations necessitated pooling of reciprocals. The character appeared to involve one major locus with three alleles: one, A of 'G50', completely dominant over a of the distorted lines, and a' of 'Oregon 1604', recessive to a. Modifying genes acting in an additive manner were assumed to be responsible for the differences in degree of distortion found among the distorted lines. Heritability estimates of the distortion, based on regression of F₂ on F₁ and using three methods were 81, 72 and 85 percent. Factors affecting the expression of the distortion were studied in a field experiment involving the effects of temperature, soil fertility and age of plants. The increase of any of these three factors decreased the degree of severity of the distortion. However, these effects were not evident on low-scoring plants. In the greenhouse, groups of plants were grown in a warm lighted room, and in a colder room with no additional lighting. The distortion was most severe in the cold room. Plants grown in the warm room had low average distortion scores which were not significantly different from the scores of plants grown in the field. No differences in endogenous auxin level could be detected between the normal and the distorted types when callus tissues from each type were cultured on solid media containing various concentrations of 2,4-D.
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  • description.provenance : Approved for entry into archive by Patricia Black(patricia.black@oregonstate.edu) on 2011-09-12T14:34:07Z (GMT) No. of bitstreams: 1 RABAKOARIHANTAAIMEE1979.pdf: 883971 bytes, checksum: 3fdbff67ec6e69fb790a5424021c2c77 (MD5)
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  • description.provenance : Approved for entry into archive by Patricia Black(patricia.black@oregonstate.edu) on 2011-09-22T21:46:35Z (GMT) No. of bitstreams: 1 RABAKOARIHANTAAIMEE1979.pdf: 883971 bytes, checksum: 3fdbff67ec6e69fb790a5424021c2c77 (MD5)

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