IMPROVING THE POTENTIAL YIELD OF SUGAR BEET CROP UNDER SALINITy STRESS | ||
| Journal of Plant Production | ||
| Article 9, Volume 31, Issue 11, November 2006, Pages 7019-7032 PDF (3.88 M) | ||
| Document Type: Original Article | ||
| DOI: 10.21608/jpp.2006.236382 | ||
| Author | ||
| S. S. Elsa, | ||
| Department of Agricultural Botany, Faculty of University, P.O. Box 68, Hadayek Shobra, 11241 | ||
| Abstract | ||
| The elevation of salt tolerance for sugar beet plants still presents problems. However, understanding the mechanisms of salt tolerance in plants is an essential for avoid or limit the risk of salt stress on the efficiency crop production. This work aimed to study the physiological and yield responses for transplanted (T) and direct seed sowing (DSS) as affected by increasing NaCI salinity up to half of the sea water level. Seeds and seven-week old plants were sown ¡n pot experiments under five NaCI salinity levels (control, 50, 120, 190 and 260 mM). The results, under control treatment, indicated no significant differences between transplanted and direct seed sowing on root or sugar yields, but a marked reduction of water consumption (21%) was recorded by transplanting compared with direct seed sowing. However, adding the first NaCI level (50 mM) significantly reduced root and sugar yields around 63% and 58% respectively for direct seed sowing, while the reduction of yield recorded 13% and 10% for transplanted compared with the control respectively. Raising NaCI level to 120mM sharply reduced yields for direct seed sowing to loss around 97% and 95% from root and sugar yields respectively, meanwhile this reduction reached around 52% and 47% for transplanted, compared with control, respectively. Moreover, no further growing was detected for direct seed sowing under the NaCI salinity levels 190 and 260mM. Meanwhile the transplanted survived and grow till the half sea water salinity level (260mM). In spite of linearly decreases for K/Na ratio ¡n leaf blade, petioles and roots due to salt treatments, but in case of transplanted at 50Mm NaCI level, K contents ¡n all plant parts are still higher than Na contents (the value of ratio is over one). On the other hand, chlorophyll content per cm2 for juvenile and adult leaves were increased by increasing NaCI but that because of reducing leaf area and increasing of leaf succulence. | ||
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