Ultrasound emission after cycles of water stress in Picea abies |
| |
Authors: | Borghetti M Raschi A Grace J |
| |
Affiliation: | lstituto Miglioramento genetico delle piante forestali, CNR, via S. Bonaventura 13, 50145-Firenze, Italy. |
| |
Abstract: | The relationships among rate of ultrasound acoustic emission (AE), xylem water potential and transpiration rate were investigated in 5-year-old potted saplings of Picea abies Karst. after cycles of water stress. Water-stressed plants displayed minimum xylem water potentials of -3.9 MPa, near-zero transpiration rates and up to 45 AE counts per minute. After rewatering, water-stressed plants no longer produced AEs. Well-watered control plants produced only a small number of ultrasonic AEs. After three cycles of water stress (lasting 24 days in total), it was estimated that about two-thirds of the functional tracheids were embolized. The concomitant reduction in hydraulic conductance was about 70%. |
| |
Keywords: | |
本文献已被 PubMed 等数据库收录! |
|