Soybean Field Evaluation for Resistance to Cotton Leaf Worm (Spodoptera Littoralis) Confirmed by SSR Markers

Abstract

Two field Experiments were conducted at km 48 Nubaria region, Alex. Cairo Desert Road, El-Behiera Government, Egypt, during 2016/2017 and 2017/ 2018 seasons, to study the effect of three humic acid levels and four boron fertilization rates on yield and quality of sugar beet (Beta vulgaris L.) cultivar monogerm (cv. Francisco). Treatments were arranged in a split-plot design in three replicates. The three humic acid levels (0= water, 3 and 6 kg/fed) at the form of (humat potasium 80% K2O) randomly assigned to the main plot. While, the four boron rates (0, 400, 800, and 1200 g/fed) were distributed at random within the sub plot at the form of Nutribor (8% Boric acid). Seeds were hand sown on 3 rd and 5 th October 2016/2017 and 2017/2018 seasons, respectively, in each (subplot), at the rate of 1 seed ball per hill on one side of the ridge at 20 cm apart. Root yield (ton/fed), top yield(ton/fed), biological yield(ton/fed), sugar yield (ton/fed), TSS%, sucrose%, purity %, extraction %, potassium %, α-amino nitrogen %, sodium %, and white sugar %, were determined in both seasons. The obtained results revealed that; 1). increasing humic acid rates from zero up to 6 kg /fed increased significantly root, biological, sugar yields ton/fed, TSS%, potassium percentage and white sugar percentage during 2016/2017 and 2017/2018 seasons. Where, the highest mean values were obtained by adding the higher level of humic acid (6 kg /fed). On the contrary, the lowest values were given by growing sugar beet plant under control treatment (zero kg/fed humic acid). On the other hand, increasing humic acid rates from zero up to 6 kg /fed decreased significantly extraction %, α-amino nitrogen %, sodium %, however, the lowest ones recorded with adding 6 kg/fed humic acid. Nevertheless, under this study, the highest mean values of these traits were obtained with control (zero kg/ fed humic acid) in both seasons, 2). increasing boron fertilization rates from zero to 400 g/fed, 800 g/fed and 1200 g/fed increased significantly the mean values of root yield, sugar yield, the total soluble solids (%), sucrose (%), purity (%), extraction (%) and white sugar (%). In addition, the highest mean values were recorded with application of 1200 g / fed, while the lowest mean values were obtained by growing sugar beet plant under the control treatment (zero boron= water) during the two seasons. On the contrast, increasing boron fertilization from zero up to 1200 g/fed decreased significantly potassium%, α-amino nitrogen (%), and sodium (%) in sugar beet root, meanwhile the lowest mean values were recorded when applying the rate of 1200 g/fed of boron fertilization. Whereas, the highest mean values were given under control treatment (zero g/fed) in the two seasons, 3). and the interaction between humic acid and boron fertilization affected significantly top yield ton/fed, biological yield ton/fed, the total soluble solids %, sucrose %, purity %, α-amino nitrogen% and sodium % during both seasons and sugar yield ton/fed during the first season 2016/2017. This...

Evaluation of Some Promising Soybean Genotypes to Infestation with Cotton Leafworm (<i>Spodoptera littoralis</i>) under Field Conditions

“…These results may be attributed to the genetic makeup of these genotypes that translated into the alteration of branches' growth rate. These results are in accordance with those observed by Serag et al [11] (19.47 g) in the second one. These results can be due to soybean genotypes Crawford and H 155 are susceptible and moderately susceptible, respectively, to the cotton leafworm infestation.…”

“…These results can be due to the integration of the seed yield of the soybean plant with its density under natural conditions of the cotton leafworm infestation. Similar results were obtained by Hassan et al [36] [37], Noureldin et al [27], Morsy et al [38], Abdel-Wahab et al [35], and Serag et al [11]…”

“…With respect to plant height, soybean genotypes H 4 L 4 and H 15 L 17 were the tallest genotypes (111.00 cm), which were statistically similar to H 113 (109.00 cm), among soybean genotypes for plant height[27] [36][37]. These results are in parallel with those observed by Serag et al[11] who showed that soybean genotypes Giza 111, H 105 , and Giza 21 were the tallest plants.…”

“…With respect to seed yield/plant, soybean genotype H 15 L 17 had the highest seed yield/plant (34.31 and 32.32 g), which was statistically similar to soybean genotypes Giza 111 (34.08 and 32.13 g), H 129 (32.49 [36] [37], Noureldin et al [27], Morsy et al [38], El-Garhy et al [39], Abdel-Wahab et al [35], and Serag et al [11] water contents which allowed cotton leafworm to attack these genotypes. These results are in similar with Hassan et al [36] [37], Morsy et al [38], Abdel-Wahab et al [35], and Serag et al [11] whom found significant variation among soybean genotypes for 100-seed weight. respectively.…”

“…In this concern, Abdel-Wahab et al [10] reported that reduced total phenols of some soybean cultivars played an important role in herbivores' attack. Particularly, Serag et al [11] showed that soybean cultivars Giza 111, Giza 22, Giza 83, Giza 21, and Giza 35 can tolerate cotton leafworm infestation with an acceptable level.…”