Ultrastructural Changes During Germination of Ascospores of Neurospora tetrasperma
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چکیده
منابع مشابه
Changes in the Permeability of Ascospores of Neurospora Tetrasperma during Germination
The respiration and germination of activated ascospores of Neurospora tetrasperma have been shown to be almost completely inhibited by concentrations of ethylene diaminetetraacetic acid (EDTA) as low as 0.0035 M. In contrast, however, dormant ascospores are insensitive to this chelating agent. At any time up to about 150 minutes after activation Ca(++) or Mg(++) can completely reverse this toxi...
متن کاملWall Structure of Ascospores of Neurospora Tetrasperma
BOURRELLY, P. 1956. Initiation pratique a la systematique des algues d'eau douce. Bull. Micr. Appliq, ser. 2, 6: 122-141. CAVE, MARION S. AND MARY A. POCOCK. 1951a. The acetocarmine technique applied to the colonial Volvocales. Stain Tech. 26: 173-174. --AND ---. 1951b. Karyological studies in the Volvocales. Amer. Jour. Bot. 38: 800-811. -AND ---. 1956. The variable chromosome number in Astrep...
متن کاملThe Reversible Heat Activation Inducing Germination and Increased Respiration in the Ascospores of Neurospora Tetrasperma
The heat activation of Neurospora tetrasperma ascospores is a reversible process, since activated spores may be returned to secondary dormancy by preventing respiration, and these secondarily dormant spores may be induced to germinate by reheating. Activation of the spores brings about a large increase in respiration prior to the germination of the spores. As the spores are reversibly activated...
متن کاملNuclear orientation in the ascospores of Neurospora tetrasperma.
OUR successive nuclear divisions occur during ascus development in Neurospora tetrasperma. The first two divisions are meiotic; the last two, mitotic. Previous cytological studies of ascus development have emphasized primarily the importance of the second and third divisions, during which rather elaborate mechanisms of nuclear movement provide that descendants of each of the two nuclei separate...
متن کاملUltrastructural Changes in Cells of Pea Embryo Radicles during Germination
Radicles (1 mm long) of pea embryo axes, excised from dormant seeds and from seeds soaked for 80 min, 8, 12, and 48 hr, were fixed in glutaraldehyde and postfixed in OsO(4). The nucleus was only slightly changed by 48 hr soaking, but cytoplasmic organelles underwent developmental changes. There was proliferation of endoplasmic reticulum, the appearance of dictyosomes, and an inward migration of...
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ژورنال
عنوان ژورنال: Journal of General Microbiology
سال: 1968
ISSN: 0022-1287
DOI: 10.1099/00221287-51-3-403