Archive image from page 97 of The cytoplasm of the plant. The cytoplasm of the plant cell cytoplasmofplant00guil Year: 1941 Guilliermond - Atkinson — 82 Cytoplasm the chondriome, consisting of a mixture of chondrioconts and mito- chondria, undergoes no modifications during the development of the embryo sac (Figs. 49, 50, 51, 52). In the sporogenous cells of the pollen grains of Lilium can- didum, the chondriome is seen clearly as short rods and granules. In the pollen mother cells, only mitochondria are to be found. Beginning with the period of synizesis, some of these mitochondria which are
Archive image from page 97 of The cytoplasm of the plant. The cytoplasm of the plant cell cytoplasmofplant00guil Year: 1941 Guilliermond - Atkinson — 82 Cytoplasm the chondriome, consisting of a mixture of chondrioconts and mito- chondria, undergoes no modifications during the development of the embryo sac (Figs. 49, 50, 51, 52). In the sporogenous cells of the pollen grains of Lilium can- didum, the chondriome is seen clearly as short rods and granules. In the pollen mother cells, only mitochondria are to be found. Beginning with the period of synizesis, some of these mitochondria which are to become amyloplasts, undergo a slight increase in size, then, at the time of the heterotypic mitosis, they elongate into chondrioconts and afterwards, in the pollen grains, break up into mitochondria. The remainder of the mitochondria are unchanged from the beginning. When the pollen grain is mature, only gran- iff «x i < -kJiw \J'\ - v>. »> ,0<-A\ V: n m Fig. 49 (left). — Embryo sac of LUium candiduvi at the beginning of differentiation. X 1500. Regaud's method. Fig. 50 (right). — Formation of proteoplasts in the embryo sac of Lilium candidum at the end of the second mitosis. Regaud'a method. ular mitochondria are found, among which a few larger than the others elaborate compound starch grains. Other investigators of the development of the chondriome dur- ing the formation of pollen in other plants have produced data more or less analogous (WAGNER, Mascre, Krjatchenko-Douze, Prosina, Mrs. Luxemburg, Krupko, Miss Py). Recently there has appeared Lewis Anderson's very good work on the develop- ment of pollen in Hyacinthus orientalis. Investigations of NlCO- LOSi-RoNCATi, Wagner, and others have shown that the chondrio- somes in the spore mother cells of some species may collect in a compact mass which surrounds the spindle as a sort of mantle dur- ing the heterotypic division and divides (chondriocinesis) at the same time as the nucleus. The significanc
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Keywords: 1940, 1941, archive, atkinson_lenette_may_rogers_1899_, book, bookauthor, bookdecade, bookpublisher, booksponsor, booksubject, bookyear, drawing, guilliermond_alexandre_1876_, historical, history, illustration, image, mblwhoi_library, page, picture, plant_cells_and_tissues, print, protoplasm, reference, vintage, waltham_mass_chronica_botanica_company, zimmermann_a_albrecht_b_1860
