Effects of Salt Stress on Agronomic Traits and Yield of Peanuts
In order to explore the effects of salt stress on agronomic traits and yield of peanuts at different stages,the pot experiment was conducted with three different salt-tolerant peanut varieties(Huayu25,8130 and Yuhua15)as test materials,and four salt concentrations(0,1.5‰,2.5‰ and 3.5‰)were treated at pegging,pod-bearing and pod-filling stages.After 12 days of salt stress treatment,the agronomic traits,chlorophyll con-tent and root activity of the plants were measured.The results showed that the main stem height and the first pair of lateral branch length of peanuts were significantly decreased with the increase of salt stress concentra-tion.The chlorophyll content of the three varieties increased first and then decreased with the increase of salt stress concentration,and the highest content was at the salt stress concentration of 1.5‰～2.5‰.Compared with the control,the root activity of peanut decreased with the increase of salt stress concentration,and the average decrease of salt tolerant variety Huayu25 was 42.31％,lower than the other two varieties.The pod yield per plant was reduced with the increase of salt stress concentration.The decrease range of yield was the largest under salt stress during the pegging stage,and the three varieties with the average decrease of 54.92％,69.43％and 76.64％,respectively.Huayu25 had the smallest yield decline under salt stress.This suggested that maintaining high chlorophyll content and root activity,promoting the accumula-tion of photosynthetic products are the response mechanism of the salt-tolerant variety to the smaller yield decline under salt stress.
万方数据
维普
