|Table of Contents|

Effect of Exogenous Sucrose on Nitrogen and Carbon Metabolism of Lettuce Under NO3- Stress(PDF)

《北方园艺》[ISSN:1001-0009/CN:23-1247/S]

Issue:
2016年01
Page:
10-15
Research Field:
Publishing date:

Info

Title:
Effect of Exogenous Sucrose on Nitrogen and Carbon Metabolism of Lettuce Under NO3- Stress
Author(s):
CHANG Lili1; LIAO Zongwen2; CHEN Riyuan1; LIU Houcheng1; SONG Shiwei1; SUN Guangwen1
(1.College of Horticulture，South China Agricultural University，Guangzhou,Guangdong 510642；2.College of Resources and Environment，South China Agricultural University，Guangzhou,Guangdong 510642)
Keywords:
sucrose; NO3- stress; lettuce(Lactuca sativa L.‘yidali’); nitrogen metabolism; carbon metabolism
PACS:
-
DOI:
10.11937/bfyy.201601003
Abstract:
Lactuca sativa L.‘Yidali’ was used as materials，the influences of exogenous sucrose (0，3 mmol/L) on nitrogen and carbon metabolism in lettuce (Lactuca sativa L.‘Yidali’)cultivated in nutrient solution under 75 mmol/L NO3- stress were investigated．With conventional nutrient solution (7.5 mmol/L NO3-) and foliar spraying water as control (CK).The shoot fresh weight，shoot dry weight，nitrate content，ammonium N content,contents of soluble sugar and sucrose，activity of nitrate reductase(NR)，glutamic dehydrogenase(GDH)，glutamine synthetase(GS)，activities of sucrose synthase(SS)，sucrose phosphate synthase(SPS)，total N content and accumulation of total N were determined in this study.The results showed that，the growth of lettuce were significantly restrained under 75 mmol/L NO3- stress at the whole growth stage，exogenous sucrose could alleviate the suppression of the 75 mmol/L NO3- stress on the growth of lettuce，the best effect were observed at the third，fourth sampling.Compared with the T1 treatment，contents of soluble sugar，sucrose in leaves of lettuce were significantly increased，the activities of SS，SPS were enhanced with the time of the growth increase gradually，the best effect were observed at the third and fourth sampling.Accumulation of total N was enhanced by T2，it was obvious at the third sampling.The activity of NR was significantly improved and nitrate and NH4+ content reduced significantly at the fourth sampling.And the activities of GDH，GS increased slightly treated with exogenous sucrose.

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Last Update: 2016-02-25