Effects of Exogenous Material on Seed Germination and Seedling Morphology of Sorghum
In order to explore the effects of different exogenous materials on sorghum seed germination and seedling morphology,different concentrations of sodium nitroprusside(SNP),γ-aminobutyric acid(GABA),salicylic acid(SA)and amino-oligosaccharide(AS)were used to study the effect on seed germination,seedling plant height,root length,basal stem diameter,shoot fresh and dry weight,root fresh and dry weight by seed priming and hydroponic methods.The results showed that:(1)0.8 mmol/L SA and 0.64 mmol/L AS had the best effect on seed germination.(2)0.02 mmol/L SNP,0.5 mmol/L GABA,0.2 mmol/L SA,and 0.64 mmol/L AS significantly promoted seedling growth.(3)The sensitivity of different exogenous materials to the vegetative organs of seedlings was different.1.5 mmol/L SNP could better promote the growth of seedlings.The root length showed a downward trend with the increase in SNP concentration.In addition to plant height,other morphological indicators of SA application showed a significant promotion effect,which was conducive to the cultivation of dwarf and strong seedlings.2.0 mmol/L AS significantly promoted the root elongation of seedlings.2.0-3.0 mmol/L GABA was not conducive to seedling growth.In summary,seed priming with different exogenous materials can solve the problems of difficult seedling emergence and weak seedling of sorghum by improving seed germination and enhancing seedling morphological indexes.The results of this study provide a theoretical basis for the development of seed treatment agents to improve the quality of sorghum seedlings.
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