Abstract: The early senescence of dwarf wheat is a prominent problem in dwarf wheat breeding and production at present.The results obtained from study for years showed that relationships are very close between the higher te- mperature level of the second heat source of dwarf wheat population and its early senescence. Discovery with the time limit of dwarf wheat with temperature which is lower than that of tall wheat provides ecological basis worth meditation for overcoming the early senescence of dwarf wheat.

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