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Effects of drought stress on leaf nitrogen, photosynthetic rate and non-structural carbohydrates of Robinia pseudoacacia L. seedlings *(PDF)

Chinese Journal of Applied & Environmental Biology[ISSN:1006-687X/CN:51-1482/Q]

Issue:
2019 06
Page:
1-16
Research Field:
Articles
Publishing date:

Info

Title:
Effects of drought stress on leaf nitrogen, photosynthetic rate and non-structural carbohydrates of Robinia pseudoacacia L. seedlings *
Author(s):
YANG Bin1 PENG Changhui1 3** ZHANG Xian1 LIU Weiguo 1 DUAN Min1 & WANG Meng2
1 Center for Ecological Forecasting and Global Change, College of Forestry, Northwest A&F University, Yangling 712100, China
2 State Environmental Protection Key Laboratory of Wetland Ecology and Vegetation Restoration , Institute for Peat and Mire Research , Northeast Normal University, Changchun 130024, China
3 Department of Biology Sciences, Institute of Environment Sciences, University of Quebec at Montreal, Montreal, C3H3P8, Canada
Keywords:
drought stress Robinia pseudoacacia L. seedling N content in leaf photosynthetic rate non-structural carbohydrate (NSC)
CLC:
-
PACS:
DOI:
10.19675/j.cnki.1006-687x.2019.03011
DocumentCode:

Abstract:
With global climate change, extreme drought and continuous drought occur frequently, which has a great impact on ecosystems in the middle latitudes. In order to reveal the effects of drought stress on nitrogen content, photosynthetic rate and non-structural carbohydrate metabolism in plant leaves, a pot experiment was conducted. The 2-year-old Robinia pseudoacacia seedlings were analyzed. Responses of leaf dry biomass, nitrogen content, net photosynthetic rate, non-structural carbohydrate (NSC) and components to different drought treatments. The experiment included three treatments: extreme drought (ED: Extreme drought), moderate drought (MD: Moderate drought) and control group. The relative water content of pot soil was 10%, 30% and 70% of field capacity, respectively. The results showed that the leaf dry biomass and net photosynthetic rate ( Pn) under ED and MD decreased continuously during the duration of 0-30 days after water control, while the net photosynthetic rate under the control treatment remained and the leaf dry biomass increased gradually. The changes of total non-structural carbohydrate (TNSC), soluble sugars (SS) and the ratio of soluble sugar to starch concentration (RSS) were similar, that is to say, they all increased at first and then decreased under ED and MD treatments. However, it remained under the control conditions. The changes of starch concentration in leaves were similar to Pn and the leaf dry biomass. ED decreased leaf nitrogen content (LN), and LN increased under MD treatment, and LN showed a stable trend under control treatment. Leaf TNSC, SS and RSS were negatively correlated with soil water content (P < 0.01), while leaf starch content, net photosynthetic rate and dry biomass were positively correlated with soil water content (P < 0.01). Our result showed short-term drought had significant effects on TNSC, SS, starch, net photosynthetic rate and leaf dry biomass of R. pseudoacacia seedlings ( P < 0.01). Therefore, R. pseudoacacia seedlings may resist moderate and extreme drought events in the short term by converting a small amount of starch temporarily stored in leaves into soluble sugar s directly used to maintain their normal metabolism and other life activities.

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Last Update: 2019-05-13