蔬菜Issue(7)：27-35,9.DOI:10.26924/j.cnki.sczz.2025.7004
不同苗龄青甘韭对干旱胁迫的响应
Response of Different Seedling Ages of Allium przewalskianum to Drought Stress
摘要
Abstract
To reveal the physiological response mechanism and drought resistance of Allium przewalskianum Regel to soil drought stress,1-year-old and 2-year-old Allium przewalskianum Regel seedlings were used as experimental materials.Six gradient soil moisture treatments(CK:70％-75％,T1:60％-65％,T2:50％-55％,T3:40％-45％,T4:30％-35％,T5:20％-25％)were set up,and morphological indicators such as dead leaf number,fresh leaf number,plant height,pseudostem thickness,leaf thickness,as well as physiological indicators such as superoxide dismutase(SOD)activity,peroxidase(POD)activity and malondialdehyde(MDA)content were systematically measured.The results showed that drought stress inhibited the growth of Allium przewalskianum Regel,manifested as a decrease in fresh leaf number,plant height,pseudostem thickness and leaf thickness,with 2-year-old seedlings being more affected than 1-year-old seedlings.In the early stage of drought stress(August 28),there was no significant difference in the number of dead leaves,plant height,and pseudostem diameter between 1-year-old and 2-year-old Allium przewalskianum Regel and CK under each treatment.As the duration of drought stress prolonged(October 12th)and the degree of drought stress intensified,the degree of growth inhibition of Allium przewalskianum Regel increased.The plant height,leaf thickness of 1-year-old Allium przewalskianum Regel seedlings under T5 treatment and pseudostem thickness under T4 treatment were the lowest,significantly reduced by 35.54％、53.69％and 43.71％compared to CK,respectively.The pseudostem and leaf thickness of 2-year-old Allium przewalskianum Regel seedlings under T5 treatment and the plant height under T4 treatment were the lowest,significantly reduced by 38.19％、48.71％and 46.35％compared to CK,respectively.In terms of physiological indicators,SOD activity,POD activity and MDA content in the leaves and roots of 1-year-old and 2-year-old Allium przewalskianum Regel showed a negative linear relationship with soil moisture content(R2＞0.9).The SOD activity,POD activity and MDA content of 1-year-old seedlings were lower than those of 2-year-old seedlings,and the latter showed a greater increase under stress(except for leaf SOD).In summary,1-year-old Allium przewalskianum Regel seedlings exhibit stronger morphological adaptability and antioxidant regulation ability,whose drought resistance is significantly better than that of 2-year-old seedlings.This study provides a scientific basis for drought resistant cultivation and precise water management of Allium przewalskianum Regel.关键词
青甘韭/苗龄/特色野菜/种质资源/干旱胁迫/形态特征/生理特性Key words
Allium przewalskianum Regel/seedling age/featured wild vegetable/germplasm resource/drought stress/morphological character/physiological characteristic引用本文复制引用
孙静波,吴雨晨,张西哲,董晨芳,关志华,王忠红..不同苗龄青甘韭对干旱胁迫的响应[J].蔬菜,2025,(7):27-35,9.基金项目
国家自然科学基金项目(32360758) （32360758）
西藏农牧学院研究生教育创新计划项目(YJS2023-28). （YJS2023-28）
