Effects of Melatonin on Seed Germination and Seedling Growth of Chaotian Pepper Under Drought Stress
In order to improve the seed germination and seedling growth of Chaotian pepper under drought stress,1,5,25,50,75,100,125,150 μmol·L-1 of melatonin solution were used to initiate the treatment of Chaotian pepper seeds,and 10%PEG solution was used to simulate water stress,and the seed germination,seedling growth and physiological changes of Chaotian pepper were analyzed.The results showed that 100 μmol·L-1 melatonin solution significantly increased the germination potential,germination rate,germination index and vigor index of the seeds under drought stress,which were increased by 425.01%,122.73%,178.55%and 796.93%,respectively,compared with the seeds without initiation.100 μmol·L-1 melatonin solution could significantly increase the plant length,root length,above ground height,fresh weight,root fresh weight,above ground fresh weight and plant dry weight of Chaotian pepper seedlings under drought stress,which were increased by 146.70%,221.74%,70.00%,48.88%,121.66%,39.38%and 285.71%,respectively,compared with the seeds without initiation.Physiological analysis showed that the catalase(CAT)activity,ascorbate peroxidase(APX)activity,and soluble sugar(SS)content of seeds induced by 100 μmol·L-1 melatonin solution were the highest,while malondialdehyde(MDA)and hydrogen peroxide(H2O2)contents were the lowest.After germination of seeds induced by 100 μmol·L-1 melatonin under drought stress,the highest levels of peroxidase(POD)activity,CAT activity,APX activity,SS,soluble protein(SP),and proline(Pro)contents were observed in the seedlings;MDA and reactive oxygen species(ROS)had the lowest content.Above results indicated that using 100 μmol·L-1 melatonin solution could induce the germination and growth of Chaotian pepper seeds under drought stress,which provided reference for drought resistant cultivation and breeding of Chaotian pepper.
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