Effects of Different Concentrations of Exogenous Amino Acids on Growth and Related Physiological Indicators of Rice Seedlings
With the test material of Kenjing 8,the effects of different exogenous amino acids(L-leucine,L-aspartic acid,L-glutamic acid,L-arginine)on rice seedlings growth and related physiological indicators were studied through greenhouse experiment.The results showed that,the addition of exogenous leucine(4 g/L),aspartic acid(1.00 g/L)and glutamic acid(0.9 g/L)could increase the accumulation of dry matter content,chlorophyll content,osmotic substance content,increase antioxidant enzyme activities and reduce malondialdehyde content,further promote root growth of seedlings,and improve the quality of seedlings.Specifically,the plant height of seedlings increased by 55.14％,57.25％and 37.90％,respectively,the stem base width increased by 10.53％,12.78％and 42.85％,respectively,the total dry matter mass increased by 66.91％,42.75％and 38.66％,respectively,and the total chlorophyll content increased by 64.41％,20.85％and 1.84％,respectively.The exogenous arginine mixed soil treatment showed that the root growth and underground dry matter accumulation of seedlings were significantly inhibited in the concentration range of seedlings.This study showed that exogenous leucine,aspartic acid and glutamic acid had significant regulatory effects.In particular,4 g/L exogenous leucine had an outstanding effect,which could be used as a technical means to control seedling growth in production of cultivating high-quality rice seedlings.
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