Contributions to the Genetics of PISUM by H. De Haan

By H. De Haan

Even with the various courses that have seemed of overdue years at the heredity within the pea, yet many of the hereditary adjustments were analysed, whereas the learn at the localization of the criteria remains to be in its preliminary degree. So the pea of which such a lot of varieties ensue, in the mean time provides lots of fabric to begin a learn. i've got set myself the duty of constructing the completest attainable research of the flower color variations and of the variations in size of stem. As regards the flower color I construct at the researches of H. TEDIN, who was once sort sufficient to spare me his types for my learn. In a fashion it's a chuffed accident that the variety of flower colors of the pea is very small, which renders the examine surveyable. Of the identified types I now own a pretty entire assortment, pains being consistently taken to complement the gathering. The examine at the heredity of the size of stem continues to be in its preliminary degree. So big a couple of kinds exist that i've got extra fabric at my disposal than should be labored up. The researches have been made within the Genetic Institute of the kingdom college of Groningen.

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For the rest Fa's were cultivated from rose dotted, of which it could be ascertained that they were constant. Rose branches or rose flower patches were not observed. + § to. White X p'urple patched Besides crosses were made with purple patched as father plant. - 4 1 2 3 purple purple purple patched purple patched total branch 1929 25. ] 6 39 1 1 purple dotted 33 16 10 14 purple patched + -- 39 17 II 15 purple dotted purple patched I 210 I 78 63 42 27 total 1930, No. 5 theor. - F 3 from a purple patched F 2 plant from the cross purple patched 46 31 12 purple ~- TABLE 359 PATCHED AND DOTTED FLOWERS This reciprocal cross, however, was different, because purple patched Fl plants never occurred.

11 : I 5 7 10 3 6 2 18 3 1 2 10 9 12 9 4 3 2 12 7 14 14 1 :n 1 8 3 1;5 1 I I I 3 15 11 8 8 12 13 15 14 10 12 6 I 4 I 19 29 17 16 15 , total theor. 25 28 . 12 i_O__ I I 1 I was ascertained from them that these purple plants are identical with the purple plants that do not descend from purple patched. § 6. Purple dotted in the progeny 0/ purple patched From table 13 it appears that the percentage of purple dotted varies greatly, that, however, purple dotted plants are very frequent. A number of purple dotted plants due to self-pollination of purple patched appeared to be constant.

From this it may be inferred that after crossings in nearly all cases the plasm passes to the normal state. Various questions are still unanswered in the study of the mosaic pea; possibly part of them can be answered in the continued research.

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