GA_(3)与6-BA复配处理对甘薯催芽育苗的影响

Effects of GA_(3)and 6-BA Combination Treatment on Germination and Seedling Raising of Sweet Potato

【目的】为有效缓解生产中GA_(3)浸种催芽所导致的甘薯细苗、弱苗问题,研究GA_(3)与6-BA复配浸种处理提升薯苗品质的可行性。【方法】设1、5、10 mg/L GA_(3)单独浸种及其分别与5 mg/L 6-BA复配后浸种处理,命名为G组与GB组,另设清水浸种(G0,CK1)和5 mg/L 6-BA单独浸种(G0B,CK2),共8个处理,研究其对甘薯品种‘心香’薯块萌芽、薯苗生长形态、单苗质量、干物质率及薯苗采收量的影响。【结果】1 mg/L GA_(3)浸种处理对调控甘薯萌芽与薯苗生长形态效果最好,薯块平均根眼萌动数达11个,总芽数达16.33个,平均苗高达8.80 cm,苗基部直径为3.01 mm。随着GA_(3)浓度升高,苗基部直径、单苗质量、干物质率均变小,薯苗品质变差。在GA_(3)与6-BA复配处理后,薯苗品质得到有效改善,且GA_(3)浓度越高效果越显著,10 mg/L GA_(3)与5 mg/L 6-BA复配浸种处理提升薯苗品质效果最好,苗基部直径为3.40 cm,干物质率最高,且单苗质量相对GA_(3)单独浸种处理有所提高。两个处理均可有效提高薯苗的采收量,且差异较小,其中GA_(3)单独处理组G1+G5+G10的采收量为282株,但薯苗品质较差,而GA_(3)与6-BA复配处理组G1B+G5B+G10B的采收量为281株,薯苗品质明显改善。【结论】综上,6-BA对于高浓度GA_(3)浸种催芽所带来的负面作用具有一定的缓解,使得薯苗茎秆粗壮、干物质率提高、种苗品质提升,且以10 mg/L GA_(3)与5 mg/L的6-BA复配处理对甘薯品种‘心香’缓解效果最为明显。

【Objective】In order to effectively alleviate the problem of sweet potato thin and weak seedlings caused by GA_(3)soaking and germination in production,the feasibility of GA_(3)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 GA_(3)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 GA_(3)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 GA_(3)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 GA_(3)and 6-BA compound treatment,the quality of potato seedlings was effectively improved.The higher the concentration of GA_(3),the more significant the effect was.Among them,10 mg/L GA_(3)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 GA_(3)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 GA_(3)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 GA_(3)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 GA_(3)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 GA_(3)and 5 mg/L 6-BA could effectively alleviate the seedling we akness caused by high concentration of GA_(3)on sweet potato variety‘Xinxiang’.