ISHS Acta Horticulturae 644: International Symposium on Growing Media and Hydroponics
EFFECTS OF OSMOTIC POTENTIALS ON GROWTH OF BEAN (PHASEOLUS VULGARIS L.) UNDER HYDROPONIC CONDITIONS |
| Authors: | H. Alyari, F. Shekari, FB. Shekari, F.R. Khoii |
| Keywords: | drought stress, growth characters, osmotic solutions, water use efficiency |
| Abstract:
Response of three lines of common bean (Phaseolus vulgaris L.): 11805, COS16 and 11816, to osmotic stress was studied. Plants were grown under greenhouse conditions using Hougland solution. Four osmotic treatments, 0, -5, -10 and -15 bar, were applied upon plants by using polyethyleneglycol (PEG 6000). The experiment lasted 35 days. At the end of the experimental period, all plants under -15 bar were found to be dead. By reducing water potentials, plant characters such as plant height, dry weight of different parts of the plants, leaf area, leaf number, chlorophyll content and water use efficiency were reduced. Stomatal frequencies, both in upper and lower leaf surfaces were increased at -5 bars, but were thereafter decreased. The studied lines responded differently to different osmotic stress. Line 11805 in the control treatment had the highest performance. However, line COS16 was the best line in comparison to the two other lines when exposed to stress. | |
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