GROWTH, PHOTOSYNTHETIC EFFICIENCY AND PRODUCTIVITY OF SNAP BEAN (Phaseolus vulgaris, L.) PLANTS AS AFFECTED BY SALINITY AND CYCOCEL APPLICATION | ||||
| Journal of Plant Production | ||||
| Article 25, Volume 25, Issue 8, August 2000, Page 5353-5369 PDF (775.63 K) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/jpp.2000.259579 | ||||
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| Authors | ||||
| K. K. Dawa,1; S. T. El-Afifi1; N. A. Omar2; F. S. Abdel-All2 | ||||
| 1Veget. and Flori. Dept., Fac. of Agric., Mansoura Univ. | ||||
| 2National Research Center, Cairo, Egypt. | ||||
| Abstract | ||||
| Two pot experiments were conducted at Agricultural Farm, Faculty of Agriculture, Mansoura University during the two successive seasons of 1990 and 1991 to investigate the effect of salinity (0, 1000, 2000 and 3000 ppm) of irrigation water and cycocel (0, 1000 and 2000 ppm) on vegetative growth, photosynthetic efficiency and productivity of snap bean plants. The obtained data could be summarized as follows: 1- The irrigation water contained salinity up to 1000 ppm had no adverse effect on the growth parameters, particularly plant height, fresh and dry weight of whole plant and its organs. 2- All plant growth parameters gradually and considerably deceased by increasing level of salinity between 1000 and 3000 ppm. 3- Photosynthetic pigment contents decreased with increasing salinity level, total leaf area and net assimilation rate followed the same trend. 4- Salinity levels had no clear effect on the appearance of the first flowers but the period between flowering to the pod harvesting was more shorter, than control with increasing the salinity levels. 5- The pod yield and pod characteristics of snap bean decreased by increasing salinity levels. 6- With increasing salinity N and K contents in leaves tissues were significantly reduced whereas, P content was not affected. 7- Total fresh and dry weight, total leaf area/plant, net assimilation rate and pigments content tended to increase with the application of cycocel under salinity effect. 8- Cycocel application had no great effect on flowering processes and yield characteristics. 9- Cycocel treatments caused an increase in N and a decrease in P and K contents. Under different salinity levels, cycocel application increased the N and decreased P and K contents. 10- Spraying cycocel on the snap bean plant which were irrigated with saline water could be counteracted the inhibition effect of salinity. Since the results indicated that, using cycocel increase the resistance of snap bean to salinity up to 2000 ppm. | ||||
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