| Autor: |
Rascio, A., Cedola, M. C., Sorrentino, G., Pastore, D., Wittmer, G. |
| Předmět: |
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| Zdroj: |
Physiologia Plantarum; May88, Vol. 73 Issue 1, p122-127, 6p |
| Abstrakt: |
The water relations of two durum wheat cultivars (Triticum durum Desf.) were studied throughout the growing season. Irrigated and unirrigated plants were compared from booting to milk stage; a period where water stress occurred naturally in the field. Modulus of elasticity (ε), turgid weight/dry weight ratio (TW/DW), relative water content at zero turgor (RWC0) and osmotic potential at full turgor (ψ100π) declined throughout the season while average turgor (ψp ) increased. Water stress induced a further decrease in ψ100π and the TW/DW ratio. The elastic modulus varied greatly. During the first stages of growth, cv. Appulo (the more resistant cultivar) showed lower ε values than cv. Valforte. At the milk stage, e was lower for the unirrigated than the irrigated plants. Correlation coefficients between the TW/DW ratio and the osmotic potential were significant for both cultivars. In cv. Valforte, TW/DW was also correlated with the average turgor and the bulk modulus of elasticity. Structural changes that affect the TW/DW ratio seem to be important factors influencing water relations and drought tolerance in durum wheat. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
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