is some evidence from studies of related species of plants that low T E a E a frequency is associated with outcrossing and high chiasma frequency is associated with selfing (reviews in GRANT 1958; BODMER and PARSONS 1962). From this it has been inferred that crossover rates have been adjusted by natural selection toward high values in selfing species to compensate for the restrictions imposed o...

Temperatures 15 degrees C or lower during the first hour of imbibition immediately inhibited respiration in lima beans, with proportional inhibition of subsequent growth of seedlings. Correlations between initial respiration rates and growth rates of seedlings were found in diferent lots of seeds.

Four isoinhibitors of trypsin have been isolated from the cowpea, Vigna unguiculata (L.) Walp., in a highly purified state, as indicated by Urea-SDS-polyacrylamide gel electrophoresis, equilibrium chromatography, and amino acid analysis. The amino acid composition was characterized by the absence of free -SH groups, high half-cysteine, and the absence of tryptophan and methionine in isoinhibito...

The wide-spread distribution of trypsin inhibitors throughout the vegetable and animal kingdoms (1) makes elucidation of their physiological function of great interest. From this point of view, resistance to peptic digestion becomes an important property, since only an inhibitor resistant to pepsin is likely to produce any physiological effect when ingested by a normal animal. The soy bean inhi...

Introduction The whitefly Bemisia tabaci Genn. (Homoptera:Aleyrodidae) has caused millions of dollars worth of crop losses in tropical and subtropical agricultural regions in the five continents of the world (Brown, 1994). Besides the direct damage caused by B. tabaci (plant nutrient loss; physiological disorders; honey dew excretions, etc), the sweet potato or cotton whitefly is an efficient v...