Study on Growth of <I>Sabina vulgaris</I> under Long Term Water Stress

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  • 慢性的な水ストレス下での臭柏の生育経過
  • マンセイテキ ナ ミズ ストレス カ デ ノ シュウハク ノ セイイク ケイカ

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Abstract

Cuttings of Sabina vulgaris growing in semi arid region in China were cultivated in gravel culture for three years to investigate the phenological response under long term water stress. The osmotic potential of the water solutions was maintained at -0.02MPa, -0.10MPa and -0.34MPa for all the experimental period by polyethylen glycol (molecular weight 6, 000) treatments. In all treatments, height growth of cuttings was stopped for a short period in summer season, from June to July. The period of this dormancy became long as the osmotic potential of the water solution decreased. Although all cuttings in the -0.02 MPa treatment (control) were alive for three years, 25% of cuttings in other two treatments (-0.10MPa and -0.34MPa) were dead at the end of the first year. Moreover, only 50% of cuttings in the -0.34MPa treatment could survive until the end of the second year. It suggested that a long time was necessary to make adjustment of physiological characteristics of cuttings to severe water stress, and many cuttings were dead before got the adaptive characteristics. Sizes and shapes of dead and alive cuttings were discussed.

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