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Inheritance studies in lettuce



Inheritance studies in lettuce



Hereditas 46(3/4): 387-470



Analysis of genes controlling various characters has been undertaken with the following results Anthocyanin pigmentation.[long dash]Two new genes I and V have been identified; the recessive i intensifies, the recessive v reduces anthocyanin pigmentation. A new allele, r[image], of the R-locus has been found. Leaf color.[long dash]The existence of two loci for leaf color genes has been demonstrated. One of the genes is identical with Bremer's gene G, the other which is called Lg is presumably identical with Thompson's gene G. Lg and G are located on the same chromosome. Leaf apex.[long dash]A dominant gene P produces pointed leaf apex, the recessive p gives blunt leaf apex. Waxiness.[long dash]A recessive gene, gl, for almost complete absence of wax has been identified. Photoperiodism.[long dash]Contrary to the results of Bremer and Grana (1935) the recessive gene 1 for insensitivity to photoperiod was found to be present only in cultivated lettuce. Hearting.[long dash]This character was found to be controlled by 3 major genes, K, H and Ca, and a number of modifiers. Spination.[long dash]Evidence has been found for the existence of an allelic series Sp, sp2, sp1 and sp. Male sterility.[long dash]A case of male sterility determined by 3 recessive genes has been found. The recessive gene, st, which gives the striate vein pattern, has in some lines a tendency to mutate to the dominant allele. The mutation takes place late in ontogeny and may be the result of minute structural rearrangements at meiosis. Two linkages groups have been found, one consisting of the 4 genes Lg, G, H and I, the second of the very closely linked genes U and V. Abnormal segregation ratios, associated with partial pollen sterility, have been found for the genes of the Lg[long dash]G[long dash]H[long dash]I linkage group. A hypothesis involving 3 complementary factors is proposed, to explain the abnormal ratios. The aberrant segregation ratios at the U and V loci are explained as due to linkage with a gametophyte factor, but it is pointed out that complementary genes may be involved also in this case. The distribution of alleles in L. sativa and L. serriola is summarized.

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Accession: 014082644

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DOI: 10.1111/j.1601-5223.1960.tb03093.x


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