甜玉米(Zea mays L.)是华南地区广泛种植的农作物,由于富含VE、VC、矿质营养和具有甜、鲜、脆等特色深受广大消费者青睐。然而,一旦甜玉米植株受到重金属影响,即可通过食物链危害人体健康,因此,保证甜玉米的优质高产对农业可持续发展具有重要意义。目前关于甜玉米对钒的富集特性研究未见报道。通过盆栽试验,研究了钒(V)胁迫下3个甜玉米品种(甜608、天贵和甜糯)的生长、吸收和积累V的特性。结果表明:土壤中适量V可促进玉米植株生长及其对V的吸收。随着V胁迫水平增大,幼苗期和拔节期甜608和天贵两个品种玉米植株生物量呈上升趋势,而甜糯玉米生物量趋于降低,与对照比较,3个品种玉米植株最高生物量分别增加303.2%、127.6%和减少62.1%。扬花期时低水平V(≤200 mg·kg-1)胁迫对植株生长有促进作用,而高水平V(>200 mg·kg-1)抑制植株生长,但总是高于对照。成熟期不同品种玉米植株生物量均呈下降趋势,分别比对照降低47.7%、54.7%和52.2%。不同品种甜玉米植株对V的积累差异不显著,各器官中V的含量分布为根>茎>叶>籽。无论在幼苗期、拔节期、杨花期和成熟期,随着V胁迫水平增大,玉米各器官对V的积累和分配比例均增大,且根部的增幅远大于茎、叶和籽等器官,当V处理水平为100 mg·kg-1和500 mg·kg-1时,各生长期甜608玉米植株根中V含量分别占总量的92.3%、81.0%、88.8%、80.0%及95.6%、92.2%、95.2%、92.7%;天贵根中V含量分别占总量的88.2%、67.8%、92.7%、77.3%及95.9%、84.5%、93.9%和86.0%;甜糯玉米分别为94.4%、89.2%、91.4%、76.1%及96.3%、91.6%、94.5%、76.9%。随着V胁迫水平增大,玉米植株的富集系数(BF)增大,但转移系数(TF)降低,二者均小于1,表明各甜玉米品种中的V主要富集在植株根部,其向地上部运输的能力较弱,从而导致植物籽实所吸收的V含量较少(<0.5μg·g~(-1))。甜玉米植物是重金属V的耐性植物。 Sweet corn (Zea mays L.) is a widely grown crop in southern China and is favored by consumers due to its high content of VE, VC, mineral nutrition and sweet, fresh and crisp properties. However, once the sweet corn plants are affected by heavy metals, they can endanger human health through the food chain. Therefore, ensuring high quality and high yield of sweet corn is of great significance to the sustainable development of agriculture. At present, no research has been reported on the enrichment of vanadium in sweet corn. Pot experiments were conducted to study the characteristics of growth, absorption and accumulation of three sweet corn varieties (sweet 608, Tiangui and Sweet waxy) under the conditions of vanadium (V) stress. The results showed that proper amount of V in soil promoted the growth of maize plant and its absorption of V. With the increase of V stress, the biomass of maize plants in sweet 608 and Tiangui cultivars at seedling stage and jointing stage showed an upward trend while that of sweet waxy maize tended to decrease. Compared with the control, the highest biomass of three maize plants Respectively, an increase of 303.2%, 127.6% and a decrease of 62.1%. Low-level V (≤200 mg · kg-1) at flowering stage promoted plant growth, whereas high-level V (> 200 mg · kg-1) inhibited plant growth but was always higher than the control. The biomass of maize plants in different maturity stages showed a decreasing trend, which was 47.7%, 54.7% and 52.2% lower than the control respectively. The accumulation of V in different varieties of sweet corn plants showed no significant difference. The content of V in different organs was root> stem> leaf> seed. At the seedling stage, jointing stage, flowering stage and maturity stage, with the increase of V stress, the accumulation and distribution of V in various organs of maize increased, and the growth of roots was much larger than that of stem, leaf and seed, When the treatment levels of V were 100 mg · kg-1 and 500 mg · kg-1, the content of V in the roots of sweet 608 maize at each growth stage accounted for 92.3%, 81.0%, 88.8%, 80.0% and 95.6% of the total, , 92.2%, 95.2% and 92.7% respectively. The content of V in Tiangui root accounted for 88.2%, 67.8%, 92.7%, 77.3% and 95.9%, 84.5%, 93.9% and 86.0% 94.4%, 89.2%, 91.4%, 76.1% and 96.3%, 91.6%, 94.5%, 76.9%. With the increase of V stress, the enrichment coefficient (BF) of maize plants increased but the transfer coefficient (TF) decreased, both of which were less than 1, indicating that V was mainly enriched in the roots of all the sweet corn cultivars The ability to transport to the shoot is weak, resulting in less V content (<0.5 μg · g -1) absorbed by plant seeds. Sweet corn plants are heavy metal V-tolerant plants.