STUDIES ON THE CORRELATION BETWEEN RESISTANCE AGAINST OROBANCHE AND THE TOLERANCE TO ALINITY IN SOME Vicia faba CUL TIVARS. | ||||
| Journal of Plant Production | ||||
| Article 9, Volume 27, Issue 7, July 2002, Page 4643-4669 PDF (3.53 MB) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/jpp.2002.255608 | ||||
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| Authors | ||||
| S. M. Salem,; O. M. EI-Shihy; A. M. Ghallab; H. M. Y. lbrahim | ||||
| Plant Physiol. Sec., Agric. Bot. Dep., Fac. of Agrlc., Cairo Unlv., Giza, Egypt. | ||||
| Abstract | ||||
| The present work aimed to study the correlation between resistance against Orobanche and the tolerance to salinity in some parasitized Vicia faba resistant cultivars, i.e. Giza 429 and Giza 843-, as well as the partially resistant Giza 674 cultivar in comparison with the susceptible Giza 3 one, through the evaluation of their growth, chemical composition and productivity when irrigated with different levels of sea water (5% and 10% as continual irrigation as well as 10% and 20% as alternately irrigation, E.C. 2.5, 5.0, 5.0 and 10.0 ds/m, respectively), in addition to the fresh water irrigation in the control treatment in the first pot experiment season; 199912000, or when irrigated with the same levels of salinity in the presence of Orobanche parasitiern in the second one; 200012001. The obtained data in both growing seasons represent a strong supportive evidence on the highly degree of the physiological tolerance not only to salt stress but also to the double stresses (salinity + Orobanche infection), which characterized both Orobanche-resistant cultivars; Giza 429 and Giza 843 that enable both of them to be adapted to even the double stresses.thue. could complete its life cycle till harvest, and produced its seed yield under such conditions without applying any specific treatments that induce such adaptation. Meanwhile, the non-adapted Giza 674 and Giza 3 cultivars were not able to do so under the same conditions. The recorded results with both resistant cultivars disclosed that this physiological tolerance brought about in both of them by creating more negative osmotic potentials (Osmotic Adjustment) through the accumulation of much more quantities of inorganic osmotica, Le. N, P, K+, Ca+2, Mg+2 and the lowest quantities of Na+ and lower Na+/Ca+2ratio as well as high K+/Na+ ratio, this in addition to the considerable accumulation of organiC protective osmolytes, i.e. sugars (especially non-reducing ones), proline, free amino acids and protein in their roots and shoots, which greatly exceeded either that in the stressed plants of the other two cultivars or even the non-stressed control plants in several cases. Such accumulation increased proportionally with increasing salinity level as an adaptable mechanism with enable both cultivars to adjust the rate between the protective and toxic intermediates of metabolism in favor of more tolerance to stress. Since, the accumulating of much more quantities of sugars (as osmolytes) in their roots might enable plants to keep better water relation under stress conditions, by increasing the ability of their roots to extract more water even from the saline soil solution. Moreover. the calculating of Relative Seed Yield % [RSy] and Stress Susceptibility Index % [SI1 values for the tested cultivars offered another strong evidence on the high tolerance to salinity, as did against Orobanche infection, which characterizing both Giza 429 and Giza 843 cultivars. In the meantime, the highly significant values of correlation coefficient for botl' mentioned cultivars strongly confirmed the highly Significant positive correlation between Orobanche resistance and salt tolerance in both Orobanche-resistant cultivars, which was the main interesting point in the present investigation. Nevertheless, the all applied stress treatments resulted in a highly significant reduction in the yield components of both resistant cultivars in spite of their superiority as regards growth, dry weights and chemical composition in comparison | ||||
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