NaCl胁迫对青花菜幼苗生长生理特性的影响
周睿 , 颉建明 , 张婧 , 张俊峰 , 李凤 , 胡世莲
甘肃农业大学学报 ›› 2024, Vol. 59 ›› Issue (06) : 117 -127.
NaCl胁迫对青花菜幼苗生长生理特性的影响
Effect of NaCl stress on the growth and physiological characteristics of broccoli
目的 研究NaCl胁迫对青花菜幼苗生长及生理特性的影响及适应机制,为盐碱地青花菜栽培提供理论及技术依据。 方法 设置6个NaCl胁迫处理,分别为0(CK)、100、200、300、400、500 mmol/L,动态测定青花菜幼苗生长及相关生理指标。 结果 与CK相比,轻度(100 mmol/L NaCl) 盐胁迫可提高青花菜幼苗生物量、光合速率、气孔导度、蒸腾速率、可溶性糖及可溶性蛋白含量;在胁迫6 d后,叶片丙二醛含量和相对电导率显著降低。中度(200~300 mmol/L NaCl)盐胁迫6 d后,青花菜幼苗叶片Fv/Fm、光合速率、气孔导度和蒸腾速率较CK均显著下降,胞间CO2浓度显著增加;叶片可溶性糖含量、可溶性蛋白含量逐渐降低;叶片丙二醛含量和相对电导率出现上升趋势;NaCl处理9 d,Z3处理MDA含量和相对电导率较CK分别增加73%、65%。重度(400~500 mmol/L NaCl) 盐胁迫后,严重抑制青花菜生长,叶片可溶性糖含量、可溶性蛋白含量持续下降,降低光合能力,胁迫3~12 d,青花菜幼苗光合速率降低55%~92%,达显著水平。 结论 根系轻度NaCl处理可促进青花菜生长,增强光合能力,提高叶片可溶性糖及可溶性蛋白含量,维持细胞渗透势;根系中度NaCl处理使青花菜幼苗生长受到抑制,叶片光合能力降低;根系重度NaCl处理严重抑制青花菜生长,降低光合能力、可溶性糖及可溶性蛋白含量,甚至导致植株死亡。
Objective The study aimed to explore the effects of NaCl stress on the growth and physiological characteristics of broccoli seedlings and the adaptive mechanism,laying a theoretical and technical basis for the cultivation of broccoli in saline-alkali soil. Method Six NaCl stress treatments were set up,i.e.,0 mmol/L (CK),100 mmol/L,200 mmol/L,300 mmol/L,400 mmol/L and 500 mmol/L,and the growth of broccoli and its related physiological indexes were dynamically measured. Result Compared with CK,the mild salt stress (100 mmol/L NaCl) increased the biomass,photosynthetic rate,stomatal conductance,transpiration rate,soluble sugar and soluble protein content of broccoli,and the malondialdehyde and relative conductivity of leaves decreased significantly in 6 d of stress.Six days after moderate salt stress (200~300 mmol/L NaCl),the leaf Fv/Fm,photosynthetic rate,stomatal conductance and transpiration rate of broccoli decreased significantly compared with CK,and intercellular CO2 concentration increased significantly.Leaf soluble sugar content and soluble protein content decreased gradually,and leaf malondialdehyde content and relative electrical conductivity showed an upward trend.In 9 d of NaCl treatment,MDA content and relative conductivity of Z3 treatment increased 73% and 65%,respectively,compared with CK.Under severe salt stress (400~500 mmol/L NaCl),the growth of broccoli was greatly inhibited,and leaf soluble sugar content and soluble protein content decreased continuously,and photosynthetic rate of broccoli was significantly reduced by 55%~92% in 3 d~12 d of salt stress. Conclusion The mild NaCl treatment promoted the growth of broccoli,enhanced photosynthetic capacity,increased the content of soluble sugars and soluble proteins in leaves,and maintained the cellular osmotic potential.The moderate NaCl treatment for root inhibited the growth of broccoli and reduced leaf photosynthetic capacity.The strong NaCl treatment for root severely inhibited the growth of cycads,reduced photosynthetic capacity,soluble sugar and soluble protein contents,even led to plant death.
broccoli / salt stress / physiological response / photosynthetic properties
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青海省重点研发与转化计划项目(2022-NK-123)
甘肃省科技技术创新引导计划项目(22CX8NA029)
甘肃省瓜菜产业技术体系专项资金(GARS-GC-1)
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