Growth and Endogenous Gibberellin Content of Dormant Groundnut Embryonic-axes as Influenced by Leaching and GA(3)

Leacthing the excised embryonic-axes from dormant groundunt (Arachis hypogaea) seeds resulted in their growth. However, their growth was stunted compared to that of after-ripened ones. It is attributed to (1) the lower amount of gibberellin-like substances in the dry, dormant embryonic-axes than in the after-ripened ones, and (2) the inability of the former to sythesise tbe tibberetllin as indicated by the lower content compared to the after-ripened ones kept in water. Exogenousty supplied GA(3) (0.1 mg/1) increased both the endogenous gibberellin and growth of the dormant, leached embryonic-axes to the level of after-ripened ones.     

Contributions to the genus phytophthora de bary from india

The paper deals with some of the contributions made from India by various research workers towards our knowledge of the fungus genusPhytophthora de Bary, in the fields of morphology, disease production, occurrence and distribution of species, host range, physiology, taxonomy and control measures. Out of the total of fifteen species and five varieties ofPhytophthora reported from India, five species (viz.,P. arecae, P. palmivora, P. colocasiae, P. parasitica andP. infestans, and four varieties ofP. parasitica, viz.,P. parasitica var.macrospora, var.sesami, var.piperina and var.nicotianae) assume considerable parasitic roles inciting serious diseases like seedling-blights, wilts, cottoney-leaks, foot-rots, blights, budrot and rots of fruits, nuts, tubers and corms etc. They are widely distributed in various parts of this country, and are mostly prevalent in rainy seasons.Phytophthora palmivora, andP. parasitica were found to have a wide host range.