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Transfer of certain Blue Lake pole bean pod characters to bush beans



Transfer of certain Blue Lake pole bean pod characters to bush beans



Proceedings American Society Hort Science 71: 416-421



Backcrossing of the pole Blue Lake recurrent parent to F2 bush progeny of the pole X bush cross has resulted in pods closely resembling Blue Lake in bush segregates. Stiff, upright growth habit has not been maintained. A minimum of 3 recessive genes, possibly with many modifiers, condition a wide range of growth expression in the Blue Lake pole X bush cross. A distinct dwarf bush habit was also conditioned by 3 major recessive genes in the same cross. Continued backcrossing resulted in elimination of leaf distortions and genetic mottles found in segregates of the first pole X bush cross. A persistent leaf distortion resembling the formative effects of 2,4-D was eliminated only by use of Blue Lake as female parent, indicating its cytoplasmic inheritance in the bush line. Persistence of short pods in bush segregates suggested a physiologic block to attainment of full pod length in a genotype similar to pole except for genes controlling bush habit. To overcome this tendency, pole Blue Lakes with longer pods are being utilized for backcrossing.

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Accession: 026002910

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