SOROKIN, HELEN P., S. N. MATHUR, and KENNETH V. THIMANN. (Harvard U., Cambridge, Mass.) The effects of auxins and kinetin on xylem differentiation in the pea epicotyl. Amer. Jour. Bot. 49(5): 444--454. Illus, 1962.-Treatment of isolated segments from the second internode of etiolated' Alaska' pea epicotyls with indoleacetic acid or 2, 4-D results in: (1) activation of fascicular cambium, and initiation of some interfascicular cambium, resulting in abundant production of secondary xylem, and in formation of hyperplastic tissue; (2) partial or even total occlusion of proto-and metaxylem. The secondary xylem formed consists of short vessel members with scalariforrnly reticulate or pitted walls, which often lack vertical connection with each other, being interrupted by unlignified cells. When IAA is used, the hyperplastic growth mainly takes the formof root primordia, whereas 2, 4-D initiates the formation of callus, but not of root primordia. The growth of this callus causes a characteristic split at the base of the internode. Treatment with kinetin, alone or in combination with the auxin, changes the above structure markedly. It leads to the initiation, over the entire circumference of the core of the internode, of a still more active cambium, which forms several layers of secondary xylem; this oonsists mainly of long vessel members with pitted walls. Hyperplastic growth is completely absent, and the xylem does not become occluded. Thus the effect of kinetin is to make the xylem more normal and to alter the epicotyl structure from herbaceous to more-or-less woody. ABSTRACT ELLINGBOE, ALBERT H., and JOHN It. RAPER. (Harvard U., Cambridge, Mass.) The Buller Phenomenon in Schizophyllum commune: nuclear selection in fully compatible dikaryotic-homokaryotic matings. Amer. Jour. Bot. 49(5): 454-459. l!162.-Internuclear selection in fully compatible, dikaryotic-homokaryotic matings of isogenic strains is apparently controlled by the incompatibility factors and, in some cases, by extra-incompatibility factors. The relationship of the structure of the incompatibility factors to internuclear selection is not clear. Both types of nuclei from the dikaryon migrate into the homokaryon, and it appears that selection occurs in the final establishment of the new dikaryon.
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