Chromosomal interchange inEleutherine plicata Herb

Chromosome behaviour at metaphase I and anaphase I of meiosis inEleutherine plicata Herb. (2n=14) is studied. Cells with chromosome associations comprising an association of four long chromosomes, in addition to five bivalents were observed more frequently than those with seven bivalents. it is concluded that the ring of four is due to a segmental interchange between the two long non-homologous chromosome pairs. The ring of four at anaphase I showed delayed disjunction, bridge formation and irregular separation of chromosomes in a number of cells while the behaviour of the other bivalents was normal.     

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.