Contributions to the Genetics of PISUM by H. De Haan

By H. De Haan

Inspite of the numerous courses that have seemed of overdue years at the heredity within the pea, yet many of the hereditary variations were analysed, whereas the learn at the localization of the standards remains to be in its preliminary degree. So the pea of which such a lot of kinds ensue, in the meanwhile 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 modifications and of the variations in size of stem. As regards the flower color I construct at the researches of H. TEDIN, who was once variety adequate to spare me his varieties for my study. In a fashion it's a chuffed twist of fate that the variety of flower shades of the pea is quite small, which renders the learn surveyable. Of the recognized varieties I now own a reasonably whole assortment, pains being continually taken to complement the gathering. The examine at the heredity of the size of stem remains to be in its preliminary degree. So great a few varieties 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 collage of Groningen.

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Variously coloured branches on purple patched The progeny of the purple branches consisted of purple, purple dotted and purple patched plants. If purple dotted + purple patched are considered 1 group (see § 15) a segregation can be ascertained in the progeny of the purple branches in 3 purple: 1 (purple dotted + purple patched), as appears from the following table. TABLE 14. 1929 purple " " " purple pmple patched purple No. cu " <=: '" E I 1 2 3 4 5 1 2 3 1 2 3 4 Self-pollinations of purple patched purple purple dotted 54 39 2 6 37 3 45 37 :3 I purple patched 3 4 8 2 4 3 3 6 3 6 I 21 11 24 16 43 11 26 21 11 9 23 35 purple dotted + total 24 11 28 24 45 15 29 24 11 15 26 41 78 50 30 24 51 52 32 24 56 52 29 41 purple patched I I m theor.

The circumstances were, however, much more unfavourable, because the Fl plants were strongly branched and the F2 plants owing to crowding formed but 1 or 2 lateral branches. In the same Fl plants an occasional purple patch was observed on the flower, from which it appears that not only in the branching but also during the flower development mutation may sporadically occur. For the rest the progeny of such purple branches behaved normally, the purple branches gave a 3 : 1 segregation, patched plants never having arisen from them.

II, fig. 8) (pI. II, fig. 12) (pI. II, fig. 8) (pI. II, fig. (pI. II, fig. 11) In the same way as in table 10 the patched and dotted flower colours mentioned in this chapter have been mentioned in the subjoined table. TABLE 41. Survey of the occurrence of the various flower colours factormutation + plasm mutation purple ~ purple patched 1923 factor combination rose patched purple dotted crypto purple apple dotted pinkish white dotted violet dotted rose dotted light purple dotted ~) 1930 1924 1928 1929 1929 1929 1929 1929 In the further research various other patched and crypto forms will most probably arise through factor combination.

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