以白肋烟TN 86为材料,研究了砍收期对晾制前后上部叶氨基酸含量的影响。结果表明,晾制前总氨基酸含量为124.47-140.78 mg/g,以酪氨酸含量和比例较高,在各个砍收时期天冬氨酸含量为7.78-11.16 mg/g,表现为打顶后4周〉6周〉5周〉3周〉2周。晾制前甘氨酸和苏氨酸与砍收时期相关性达显著水平。晾制后总氨基酸含量为73.78-97.77 mg/g,以天冬氨酸比例和含量较高,在各个砍收时期天冬氨酸含量为23.73-31.25 mg/g,以打顶后2周砍收的含量较高,打顶后4周砍收比例较高。天冬氨酸在晾制前含量和比例不高,晾制后却大幅度上升。晾制后甘氨酸、苏氨酸、脯氨酸、异亮氨酸、亮氨酸、酪氨酸、苯丙氨酸和赖氨酸与砍收期相关性达到极显著水平,天冬氨酸、组氨酸、精氨酸、丙氨酸、缬氨酸、蛋氨酸和总氨基酸与砍收期的相关性达到显著水平。砍收时期对晾制后氨基酸含量影响大于晾制前。打顶后2周砍收有利于上部叶天冬氨酸积累和形成。
This paper studied effect of different stalk cutting time on upper leaves amino acid content before and after the air-curing of burley tobacco TN 86. The results showed that,the total acids content was in the range of 124. 47-140. 78 mg/g,the content and ratio of Tyr were higher before the air-curing,the Asp acid content was in the range of 7. 78 -11. 16 mg/g at different stalk cutting time before the air-curing,manifested as topping four weeks〉six weeks〉five weeks〉three weeks〉two weeks. There was a significant level between Gly,Thr and stalk cutting time before the air-curing. The total acids content was in the range of 73. 78-97. 77 mg/g,the content and proportion of Asp were higher after the air-curing. The Asp acid content was in the range of 23. 73-31. 25 mg/g at different stalks cutting time after the air-curing;its content received a higher proportion when stalk cutting after top-ping two weeks and its ratio received a higher proportion when stalk cutting after topping four weeks. The content and the ratio of Asp were not high before the air-curing,but increased significantly after the air-curing. There was a extremely significant level between Gly,Thr,Pro,Ile,Leu,Lys,Phe,Tyr and stalk cutting time;there was a signifi-cant level between Asp,His,Arg,Ala,Val,Met,total amino acids and stalk cutting time. Effect of the amino acid contents after air-curing was greater than before air-curing at different stalk cutting time. It was conducive to the ac-cumulation and formation of Asp acid in upper leaves when stalk cutting after topping two weeks.
Acta Agriculturae Boreali-Sinica
Stalk cutting time