Glycine-betaine water stress accumulation

Effect of water stress on susceptibility of barley to aphids. Barley seedlings were subjected to water stress. These plants accumulated among other compounds proline and glycine-betaine (Table IV). Also, the more stressed plants were the most susceptible to aphids. The cultivar used in this experiment lacked gramine. However, when a gramine-containing cultivar was used gramine concentration was not affected by water stress. 

A variety of compounds may accumulate in plants under water stress (18, 19). One of these compounds, glycine-betaine, increased reproduction rates of aphids in artificial diets. It is likely that the observed increased susceptibility of barley to aphids may be due to glycine-betaine accumulation in barley leaves. It is... 

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