Vulnerability of U.S. Maize Germ Plasm to Phaeosphaeria Leaf Spot

OCCURRENCE OF NORTHERN LEAF BLIGHT, Phaeosphaeria LEAF SPOT , SOUTHERN LEAF BLIGHT, RUST AND MAIZE STREAK VIRUS IN KENYA

The phaeosphaeria leaf spot of maize in Brazil: evidences of a new etiological agent?

spot, has been observed causing severe damage in all maizegrowing areas of Brazil since 1982 (Fantin, 1994). The causal organism of this disease was initially described in the USA as Phaeosphaeria maydis (Henn.) Rane, Payak & Renfro (sin. Sphaerulinia maydis Henn.), anamorph Phyllosticta sp. (Rane et al., 1966). Doubts regarding the etiology of this disease have resulted in several attempts to ...

What Is Germ Plasm?

Special Articles: Normal Human Stromata as Antigens for Complement Fixation in the Sera of Patients with Relapsing livax Malaria: DR. MICHAEL HEIDELBERGER and MANFRED M. MAYER. Induction of Leukemia in Mice: D. ARTHUR KIRSCHBAUM and DR. HENRY S. KAPLAN. The Neutralization in Vitro of Avian Pneumoencephalitis Virus by Newcastle Disease Immune Serum: D. J. R. BEACH. The Isolation of the St. Louis...

Species of Cercospora associated with grey leaf spot of maize

Grey leaf spot is a serious yield-reducing disease of maize (Zea mays) in many parts of the world where this crop is cultivated. The causal organism associated with the disease is Cercospora zeae-maydis. Two potential sibling species have been recognized as Groups I and II. The DNA sequences for the internal transcribed spacers (ITS1 & ITS2), the 5.8S rRNA gene, elongation factor 1-alpha, histo...

Investigations of the germ-plasm in relation to nuclear transplantation.

THE origin of the germ-cells has been extensively investigated in both invertebrates and vertebrates. In invertebrates it has been traced to the early cleavage of the zygote, e.g. in such forms as Ascaris megalocephala (Boveri, 1887) and Sciara (Metz, 1938). Within the vertebrate group the cases in which primordial germ-cells have been detected in cleavage stages are very few. Eigenmann (1891) ...