Abstract
BackgroundSalinity has a negative effect on the productivity of many crops. Therefore, the present study was conducted to investigate the effect of pre-soaking in different concentrations of tryptophan (0.0, 2.5, and 5.0 mM) on growth, yield and root quality of two sugar beet cultivars (DS-9004 and LP-15) under different salinity levels (320, 2000, 4000, 6000, and 8000 ppm) in an effort to reduce salinity damage on sugar beet. The data were collected at 2 stages of growth (75 and 180 days after sowing).ResultsThe results revealed that the pre-soaking in tryptophan treatments (2.5 mM) were the most effective treatments under different salinity levels and caused significant increases in all tested parameters of this study. Moreover, increasing salinity levels decreased significantly the root purity parameters and increased impurity parameters of sugar beet. The DS-9004 cultivar gave the highest values of all studied parameters compared with the LP-15 cultivar under different salinity levels with tryptophan (2.5 mM). Chlorophyll a content and chlorophyll a/b ratio, as well as carotenoids content, were highest in DS-9004 cultivar, while chlorophyll b content was highest in LP-15 cultivar at 75 days.ConclusionsSalinity level up to 320 ppm positively affected the growth yield of sugar beet while the highest significant reduction was associated with increasing salinity up to 8000 ppm. Thus, pre-soaking in tryptophan (2.5 mM) has a promotive effect on increasing sugar beet yield under water salinity conditions.
Highlights
Salinity has a negative effect on the productivity of many crops
Materials and methods A pot experiment was performed at the screen greenhouse of Field Crops Research Department, National Research Centre, Dokki, Giza, Egypt, to study the effect of pre-soaking of two cultivars (DS-9004 and LP-15) sugar beet seeds (Table 1) in different concentrations of tryptophan (0.0, 2.5, and 5.0 mM) on growth, yield, and root quality of sugar beet plants grown under different salinity levels (320, 2000, 4000, 6000, and 8000 ppm)
Effect of pre-soaking with tryptophan on root parameters of sugar beet at 75 days after sowing under different salinity levels Data in Table 2 clearly indicated that pre-soaking sugar beet seeds with tryptophan (2.5 mM) under different salinity levels increased significantly sugar beetroot parameters, i.e., root length and diameter, root fresh and dry weight (g) at 75 days after sowing as compared with tryptophan 0.0 and 5.0 mM
Summary
Salinity has a negative effect on the productivity of many crops. the present study was conducted to investigate the effect of pre-soaking in different concentrations of tryptophan (0.0, 2.5, and 5.0 mM) on growth, yield and root quality of two sugar beet cultivars (DS-9004 and LP-15) under different salinity levels (320, 2000, 4000, 6000, and 8000 ppm) in an effort to reduce salinity damage on sugar beet. Sugar beet (Beta vulgaris L.) family Chenopodiaceae is one of the world’s leading sugar crops. It is the second main source of sugar after sugar cane, it contains sucrose up to 21% (Memon et al, 2004). The area of sugar beet cultivated, total production (ton) and average root yield (ton ha−1) reached to 4.47 million ha, 266.8 million tons, and 59.6 ton ha−1 (FAOSTAT, 2016). Sugar beet has stronger salt-tolerant characteristics than other crops. The total production of sugar beet in 2016 was about 13,323,369 tons with an area of 254,991 ha with an average root yield of 52.3 ton/ha−1 (ha = 2.38 fed). Sugar beet produced 1.25 million tons of sugar represented about 50% of the local production (FAOSTAT, 2016)
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