Guangdong nongye kexue (Jun 2023)
Effects of GA3 and 6-BA Combination Treatment on Germination and Seedling Raising of Sweet Potato
Abstract
【Objective】In order to effectively alleviate the problem of sweet potato thin and weak seedlings caused by GA3 soaking and germination in production, the feasibility of GA3 and 6-BA combination soaking treatments to improve the quality of sweet potato seedlings was studied.【Method】The seeds were soaked with 1, 5 and 10 mg/L GA3 alone and mixed with 5 mg/L 6-BA respectively, which were named as group G and group GB. In addition, there are two treatments of water immersion (G0, CK1) and 5 mg/L 6-BA separate immersion (G0B, CK2), a total of 8 treatments were conducted to study its effects on the germination of sweet potato tubers, the growth morphology of sweet potato seedlings, weight of the single seedling, dry matter percentage and the number of harvested seedlings in 'Xinxiang'.【Result】The results showed that 1 mg/L GA3 soaking treatment had the best effect on regulating the germination of sweet potato and the growth morphology of sweet potato seedlings. The average number of root eye germination of sweet potato was 11, the total number of buds was 16.33, the average seedling height was 8.80 cm, and the diameter of the seedling base was 3.01 mm. However, with the increase of GA3 concentration, the diameter of the seedling base, the weight of the single seedling and the dry matter percentage became smaller, and the quality of the sweet potato seedlings became worse. After GA3 and 6-BA compound treatment, the quality of potato seedlings was effectively improved. The higher the concentration of GA3, the more significant the effect was. Among them, 10 mg/L GA3 and 5 mg/L 6-BA compound soaking treatment had the best effect on improving the quality of potato seedlings. The diameter of the seedling base was 3.40 cm, the dry matter percentage was the highest, and the weight of the single seedling was higher than that of GA3 soaking treatment alone. The two treatment groups can effectively improve the number of harvested potato seedlings, and the difference is very small. Among them, the total number of seedlings harvested in the GA3 treatment group(G1+G5+G10) was 282, but the quality of potato seedlings was poor. The total number of seedlings harvested in the combined treatment group of GA3 and 6-BA(G1B+G5B+G10) was 281, and the quality of potato seedlings was significantly improved.【Conclusion】In conclusion, 6-BA can alleviate the disadvantages caused by high concentration GA3 soaking seed, make the stems of sweet potato seedlings thick, the dry matter percentage increases, and the quality of the seedlings improves. Furthermore, the combination of 10 mg/L GA3 and 5 mg/L 6-BA could effectively alleviate the seedling weakness caused by high concentration of GA3 on sweet potato variety 'Xinxiang'.
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