【摘要】 为探究有机多肽酶活性促进剂对鲜食型甘薯产量和品质的调控效应,在大田条件下,以鲜食型甘薯品种龙薯9号和苏薯8号为供试材料,每个品种设置全生育期不喷施有机多肽酶活性促进剂(CK)、有机多肽酶活性促进剂栽插前蘸根+栽后40 d叶面喷施(P1)和有机多肽酶活性促进剂栽插时灌根+栽后40 d叶面喷施(P2) 3个处理,研究其对鲜食型品种干物质积累分配、产量及品质的影响。结果表明,2个品种的P1和P2处理生长中后期叶片的磷酸蔗糖合成酶(SPS)活性、蔗糖含量、收获期植株总干重和块根干重均显著高于CK。龙薯9号各处理收获期的侧枝茎和块根干物质分配比例均无显著差异,P1和P2处理的主茎下部叶、主茎下部茎干物质分配比例均显著低于CK;苏薯8号P2处理的主茎下部叶、主茎下部茎、侧枝茎和侧枝生长点干物质分配比例均显著低于CK和P1处理,块根干物质分配比例显著高于CK和P1,分别提高8. 98%和6. 23%。龙薯9号P2处理收获期块根可溶性糖含量与P1无显著差异,但显著低于CK,降低5. 22%,P2处理的块根淀粉含量显著高于CK和P1,分别提高18. 76%和9. 23%,干率与P1处理无显著差异,但均显著高于CK,分别提高4. 56%和5. 71%;苏薯8号块根的可溶性糖含量各处理无显著差异,且P2处理的块根淀粉含量和干率与P1均无显著差异,但显著高于CK,其中淀粉含量提高6. 13%,干率提高4. 51%。2个品种P2处理的块根产量均显著高于CK和P1,其中龙薯9号分别提高30. 46%和14. 42%,苏薯8号分别提高27. 72%和11. 69%。综上,施用有机多肽酶活性促进剂有利于提高鲜食型品种块根产量和淀粉含量,其中P2处理增产幅度最高,其对可溶性糖含量的调控存在品种间差异。本研究为鲜食型甘薯提质增效和生态种植技术提供了理论依据。更多还原

【Abstract】 In order to investigate the regulating effect of polypeptidase activity promoter on the yield and quality of the raw-edible sweet potato,a field experiment was conducted by using the raw-edible sweet potato varieties Longshu 9 and Sushu 8. Each cultivar received one of the following treatments: CK-no application of the polypeptidase activity promoter throughout the entire growth period; P1-root dipping prior to planting and foliar spraying at 40 days after planting with the polypeptidase activity promoter; P2-root irrigation when planting and foliar spraying at 40 days after planting with the polypeptidase activity promoter. The effects of polypeptidase activity promoter on the dry matter accumulation and distribution,root yield,and quality were estimated. The results show that P1-and P2-treated plants exhibited considerably higher leaf SPS activity,sucrose content during mid-and late-growth stages,and plant and root dry weights at harvest than CK-treated plants. At harvest,distribution portion of dry matter in the lateral branches and roots of Longshu 9 plants were not significantly different under different treatments. Distribution portion of dry matter in nether leaves of main stem and nether stem of main stem in Longshu 9 P1-and P2-treated plants was significant lower than that in CK-treated plants. For cultivar Sushu 8,distribution portion of dry matter in nether leaves of main stem,nether stem of main stem,lateral branches and growth point of lateral branches in P2-treated plants was significant lower than that in CK-and P1-treated plants. Compared with CK-and P1-treated plants,the distribution portion of dry matter in tuberous roots of P2-treated plants was significantly increased by 8. 98% and 6. 23% for cultivar Sushu 8,respectively. At harvest,the soluble sugar content of P2-treated plants for Longshu 9 showed no significant difference with that in P1-treated plants and was significantly decreased by 5. 22% compared with CK-treated plants. The starch content of P2-treated plants for Longshu 9 was significantly increased by 18. 76% and 9. 23% compared with CK-and P1-treated plants. The dry matter contents of tuberous roots of P2-treated plants for Longshu 9 showed no significant difference with that in P1-treated plants. Compared with CK treated plants,the dry matter contents of tuberous roots of P1-and P2-treated plants for Longshu 9 significantly increased by 4. 56% and 5. 71%,respectively. The soluble sugar content of tuberous roots for Sushu 8 showed no significant difference among different treatments whereas the starch content and dry matter contents of tuberous roots in P2-treated plants showed no significant difference with that in P1-treated plants.Compared with CK-treated plants,the starch content and dry matter content of tuberous roots in P2-treated plants were significantly increased by 6. 13% and 4. 51%,respectively. Compared with CK-and P1-treated plants,the root yield of P2-treated plants were significantly increased by 30. 46% and 14. 42% for cultivar Longshu 9 and by 27. 72% and11. 69% for cultivar Sushu 8,respectively. In conclusion,application of polypeptidase activity promoter improved the root yield and starch content in tuberous roots of raw-edible cultivars. P2-treated plants exhibited the highest increase in root yield and the regulation effects of soluble sugar content in tuberous roots was different among cultivars. This study provides a theoretical basis for industrial development of raw-edible sweetpotato both in quality and in efficiency and for the technologies of ecological planting.更多还原