The Transfer of Desoxyribose Nucleic Acid from the Tapetum to the Microsporocytes at the Onset of Meiosis

Cytomixis in Brassica napus var. oleifera and Brassica campestris var. oleifera (Brassicaceae).

“…Originally reported to occur between microsporocytes (KOrnicke 1901, Gates 1911), cytomixis was later found to occur also between somatic cells (Jacob 1941, Sarvella 1958, Bowes 1973) and between tapetum cells and microsporocytes (Cooper 1952). In B. napus and B. campestris, chromosome transfer only occurred between microsporocytes.…”

Induced meiotic reductions in root-tips. IV Concluding remarks.

“…It may also be useful to recall a significant observation of Cooper (1952). He observed that in many plant species the tapetum of anther secreted specific sub stances and nutrients for the growth of sporogenous tissue.…”

Localization of Nucleic Acids and Insoluble Polysaccharides in the Anther of <i>Zea mays</i> L. A Histochemical Study

“…In these, role of nucleic acids and polysaccharides in the histochemical constitution and probable functional mechanism of a few stray anther tissues has been studied to a lesser ex tent. Cooper (1952) has recorded RNA content rich in the microsporocytes, but only a negligible quantity in the tapetum . On the contrary, Painter (1940in Cooper 1952) has observed rich concentration of RNA both in the tapetum as well as sporogenous tissue before meiosis.…”

“…Cooper (1952) has recorded RNA content rich in the microsporocytes, but only a negligible quantity in the tapetum . On the contrary, Painter (1940in Cooper 1952) has observed rich concentration of RNA both in the tapetum as well as sporogenous tissue before meiosis. DNA synthesis occurs in microsporocytes during the premeiotic interphase , but twice in the tapetum preceeding each nuclear division, as assessed by Taylor (1958Taylor ( , 1959 employing autoradiographic tech nique.…”