Volume 8, Issue 5
November 1938, pages 373-404
pp 373-395 November 1938
pp 396-398 November 1938
Almost all grain sorghums are without a purple spot on the top of their grains. In these, the tip of the grain has merely the brownish scar left by the dried stylar base. In some varieties of Kafir the stylar scar is surrounded by a small purple spot. In African Kafirs this purple spot is either feeble or latent. In some Kafirs from America the spot is patent. In crosses with varieties with no purple-tip on the grain the purple tipped grain behaves as a simple Mendelian dominant to the common tipless condition. The gene responsible for this purple-tip on the top of the grain has been designated PGT. In the presence of ‘Q’ factor this spot is reddish purple. With ‘q’ it is blackish purple. The purple on the tip of the grain belongs to the same series as the leaf-sheath purple, and the glume purple that goes with it. This factor is independent of the factor ‘W’ which determines the manifestation of pericarp colour in wholeness. The presence of this dominant colour character in the African Kafir and its disappearance in other cultivated sorghum throws light on the origin and distribution of many of the cultivated sorghums.
pp 399-404 November 1938
The presence of glutathione in the latex ofCarica papaya and the press juices of pine apple, cucumber, andFicus bengalensis, has been established.
The tripeptide has been isolated from the latex ofCarica papaya in the form of its cuprous compound.
A quantitative estimation of glutathione has been made, employing the specific glyoxalase reaction.
Glutathione is shown to be the natural activator of plant proteinases which in this respect also, are analogous to liver cathepsin and yeast proteinase.