摘要
以2年生盆栽鲁北冬枣为试材,研究了其对尿素、甘氨酸(Gly)和谷氨酸(Glu)的吸收利用与响应特性.结果表明:3种形态氮均可被冬枣吸收利用,与尿素相比,氨基酸态氮吸收的量较少.若尿素的吸收量以100%计,则叶片对Gly和Glu的相对吸收量分别为28·88%和11·73%,吸收到的氮素主要分配到叶片和枣头枝中;而根对Gly和Glu的相对吸收量则分别为50·48%和42·72%.冬枣吸收尿素、Gly和Glu后,叶片中的谷草转氨酶(GOT)和谷丙转氨酶(GPT)活性提高,可溶性蛋白质含量增加;但不同形态氮素处理对硝酸还原酶(NR)活性的影响存在差异,尿素可显著提高NR活性,Glu对NR活性影响不大,Gly降低了NR活性.与尿素相比,氨基酸态氮能明显提高冬枣果实的着色个数、着色面积以及果实中可溶性固形物含量.
With pot experiment, this paper studied the absorption and utilization of applied urea N, Gly N and Glu N by two years old winter jujube. The results showed that all of the three N forms could be absorbed by the winter jujube, but the absorption rate of Gly N and Glu N was less than that of urea N. Taking the absorption rate of urea N as 100% , the relative absorption rate of Gly N and Glu N by jujube leaves was 28. 88% and 11.73%, respectively, and the absorbed N was mainly allocated to the leaves and neonatal branches. Jujube roots could absorb 50. 48% of Gly N and 42. 72% of Glu N. The transaminase activity and soluble protein content in jujube leaves were increased after the application of these three N forms, but the leaf nitrate reductase activity was enhanced significantly by urea N, decreased by Gly N, and less affected by Glu N. Compared with urea N, amino acid N could significantly increase the number of colored fruits and their colored area, as well as the content of fruit soluble solid matter.
出处
《应用生态学报》
CAS
CSCD
北大核心
2007年第6期1265-1269,共5页
Chinese Journal of Applied Ecology
基金
国家自然科学基金项目(30571286)
山东省优秀中青年科学家奖励基金资助项目(2005DS06006)
关键词
冬枣
氨基酸
吸收
硝酸还原酶
果实色泽
jujube
amino acid
absorption
nitrate reductase
fruit color.
