Ecological responses to water stress in Echinochloa crus-galli (L.) Beauv. s. l.

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  • 水ストレスに対するイヌビエ（広義）の生態的反応
  • ミズ ストレス ニ タイスル イヌビエ コウギ ノ セイタイテキ ハンノウ

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Abstract

Responses of the ecological traits in Echinochloa crus-galli (L.) Beauv. var. praticola, var. formosensis and var. crus-galli were investigated under drought, upland and flooded conditions in order to define the ecological differentiation and habitat segregation of E. crus-galli s. l.. In the upland (control) condition, var. praticola showed lower plant height, more tillers, earlier flowering, higher reproductive allocation, smaller seeds and more seed production than var. formosensis, and var. crus-galli had wide variations across the characteristics of the two varieties.<br> All varieties showed vigorous growth and reproduction, and increased root allocation in response to the flooded condition, therefore it was suggested that E. crus-galli s. l. possessed ecological characteristics that adapted to the waterlogged habitat. In the drought condition, var. praticola increased its seedling height, grew without reduction of root allocation, and did not decrease its number of seeds as much by reducing the seed size. On the other hand, var. formosensis remarkably restrained growth and reproduction in the drought condition.<br> Therefore, it appears that var. praticola adapted to unstable environments such as roadsides and upland fields by acquiring tolerance to drought stress, and var. formosensis adapted to coexist with rice in the paddy field with disturbance of weeding, based on the characteristics of E. crus-galli s. l. that grew vigorously in the waterlogged habitat.

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