Effects of Osmo-Hydropriming and Drought Stress on Seed Germination and Seedling Growth of Rye (Secale Montanum)

ProEnvironment Promediu

Hamidreza Khazaie¹ 

[1] USAMV-CN, IPM

关键词: osmotic potential;    priming;    seed;    Secale montanum.;   

DOI  :  

学科分类：社会科学、人文和艺术（综合）

来源: Bioflux SRL

【 摘 要 】

Germination and seedling establishment are the major and critical steps in establishment of the crops in thearid and semi-arid environments. In this study an experiment was conducted to evaluate the effects of different timeseed priming (osmo-hydropriming) on germination and seedling growth of Secale montanume seeds under droughtconditions. Seeds were immersed in water with osmotic potentials of -0.5, -1 and -1.5 MPa. PEG600 was employed toinduce the required levels of osmotic potentials. Induction of hydropriming was obtained by immersing the seeds indistilled water with aeration and no aeration conditions. Both two priming treatments were conducted at 3 time duration(6, 12 and 24 hours). These primed seeds were germinated and grew at osmotic potentials of 0 (distilled water), -0.5, -1,and -1.5 MPa by PEG6000. Results showed that the seed germination and seed growth were inhibited by increasingdrought stress as the germination percentage of hydroprimed seeds with aeration was reduced from 74.02% to 60.45%.Both shoot and root growths were inhibited by increasing osmotic potential. Hydroprimed seeds with aeration causedreduction shoot and root length, while root/shoot length ratio was increased by hydroprimng without aeration. The leastpriming time (6 hr) had more effects on germination percentage. Result also showed that seed treatment at differencelevels of PEG significantly affected germination characteristics. The highest germination percentage was obtained fromseed priming with PEG induced -0.5 MPa osmotic potential. The highest root/shoot length ratio was related toosmopriming with -0.5 MPa. The time of osmopriming didn’t show significant effect on germination characters andseedling growth. However 6 h osmopriming was more effective.

【 授权许可】

CC BY