Effects of L-Tryptophan on Growth and Development of Sorghum under Low Nitrogen Condition
In order to promote environmentally friendly and productive sorghum farming methods in the western Liaoning region,it is important to investigate the effects of exogenous tryptophan on the photosynthetic properties and yield of sorghum in low nitrogen environments.A split plot design was employed in field experiments,with premium glutinous sorghum variety Jiniang 3 serving as the experimental material.Two nitrogen application levels were set,with one-third of the conventional nitrogen fertilizer amount(N1)and conventional nitrogen fertilizer amount(N2)applied.Clear water(Y1)and 50 mg/L tryptophan(Y2)were sprayed on the leaves during the sorghum jointing stage to study the photosynthetic characteristics,agronomic traits,and yield.The results showed that under N1 and N2 levels,spraying tryptophan(Y2)could increase the net photosynthetic rate(Pn)and chlorophyll relative content(SPAD value)of sorghum leaves,significantly increasing yield,1000-grain weight,and panicle weight.Compared to Y1 treatment,the yield were increased by 1.91％and 6.70％,respectively.In different treatment combinations,spraying exogenous tryptophan could reduce plant height,increase stem diameter,panicle length,and leaf area.Therefore,under low nitrogen conditions,spraying tryptophan during the jointing stage of sorghum was beneficial for increasing grain yield,1000-grain weight,stem diameter,and panicle length,reducing plant height and lodging risk,increasing SPAD value and Pn,increasing grain weight,and promoting yield and income increase.
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