NAA/KT浸种对新植蔗产量、根系发育及抗倒伏能力的影响

为明确α-萘乙酸（NAA）和激动素（KT）浸种对新植蔗产量、根系发育及抗倒伏能力的影响,完善甘蔗优质高产抗倒伏化学调控技术理论基础,采用室内盆栽试验和田间试验相结合的方法,以栽培甘蔗品种桂糖29（GT29）、桂糖42（GT42）、桂糖49（GT49）和桂糖55（GT55）为试验材料,探讨不同浓度配比NAA/KT浸种对新植蔗茎叶鲜重、根系活力、根系形态结构和茎秆抗折断力的影响。结果表明,室内条件下,NAA/KT在20~40时,GT29和GT42根系活力、总根长和根体积相比对照显著增加。田间试验中,NAA 25~50mg/L配合KT 1mg/L浸种处理对收获期甘蔗叶片鲜重、根系发育及茎秆抗折断力促进效果最优,其中2019和2020年试验中4个品种叶片鲜重和产量均比对照增加;根长、根表面积、根体积、根尖数和根干重分别比对照平均增加33.0%、39.0%、43.7%、27.4%和44.9%;茎秆抗折断力平均增加26.0%。综上所述,NAA/KT浸种处理提高了新植蔗叶片鲜重和蔗茎产量,提高了根系活力,促进根系发育;田间条件下用NAA 25~50mg/L和KT 1mg/L浸种可显著增加新植蔗收获期产量、总根长、根表面积、根尖数、根干重以及茎秆抗折断力,进而提高甘蔗抗倒伏能力。

Effects of NAA/KT Presoaking on Sugarcane Yield,Root Development and Lodging Resistance

Using the sugarcane varieties Guitang 29 (GT29), Guitang 42 (GT42), Guitang 49 (GT49), and Guitang 55 (GT55) as materials, a combination of greenhouse pot experiment and field experiment were carried out with the aim of clarifying the effects of α-naphthyl acetate (NAA) and kinetin (KT) presoaking on sugarcane yield, root development, and lodging resistance, and improving the theoretical basis of sugarcane high-quality, high-yield, and lodging-resistant. Investigating the effects of NAA/KT presoaking at various concentrations on the leaf fresh weight, root vigor, root shape, and stalk breaking resistance of newly planted sugarcane. The findings demonstrated that, in comparison to the control treatment, the root vigor, root length, and root volume of GT29 and GT42 increased significantly under greenhouse conditions when the NAA/KT ratio was 20-40. Under field conditions, the combination of NAA 25-50mg/L and KT 1mg/L presoaking treatment had the greatest impact on sugarcane fresh leaf weight and stem yield, root growth, and stalk lodging resistance. During 2019 and 2020 experimental years, leaf fresh weights and yields of four sugarcane varieties were higher than that of the control treatment; root length, root surface area, root volume, root tip number and root dry weight were increased by 33.0%, 39.0%, 43.7%, 27.4% and 44.9%, respectively, stalk lodging resistance increased by 26.0%. It could be concluded that NAA/KT presoaking could increase fresh leaf weight, stem yield, and root vigor of the new planted sugarcane, and promoted sugarcane root development; under field trial, presoaking with NAA 25-50mg/L combined with KT 1mg/L could significantly increase stem fresh yield, root length, root surface area, root tip number, root dry weight and stalk breaking resistance of newly planted sugarcane, thereby improving sugarcane lodging resistance.