Abstract: Field experiments are conducted with 87 wheat,67 barley and 6 triticale samples to approach the ecologi-cal mutations of their main agronomic characters. The results indicate that the sprouting stage(X₁)of wheat and triticale in Japan and in the Loess Plateau arid mountainous region of China tends to be paral-lel. With intensifying drought,plant height(X₂)shortens obviously,and ear length(X₃)has no marked mutation. On arid lands of China, the 1000 grain weight(X₄)of wheat and triticale is similar to that onmoist lands of Japan, but that of barley is higher. There are positive correlations among X₁,X₃ and X₄ of barley in Japan,and among X₁,X₂,X₃ and X₄ in China,Later varieties may be high yielded on China drought lands. It is considered reasonable to introduce late variet

Key words: common mycorrhizal network, tomato, inter-plant communication, defensive response, disease resistance.