期刊
PLANT PHYSIOLOGY AND BIOCHEMISTRY
卷 139, 期 -, 页码 256-263出版社
ELSEVIER FRANCE-EDITIONS SCIENTIFIQUES MEDICALES ELSEVIER
DOI: 10.1016/j.plaphy.2019.03.028
关键词
CO2 enrichment; Cucumber; Nitrogen assimilation; Salt sum; Water balance
资金
- National Natural Science Foundation of China [31471918, 31872154]
- Shandong Key Research and Development Plan [2017CXGC0201]
- National Science & Technology Support Program of China [2014BAD05B03]
- Shandong Agricultural Major Application Technology Innovation [2016-36]
- Science and Technology Innovation Team of Shandong Agricultural University-Protected Horticulture Advantageous Team [SYL2017YSTD07]
The effects of CO2 enrichment on water balance and nitrogen (N) assimilation in cucumber (Cucwnis sativus L. cv. Jinyou No.35) seedlings under salt stress were investigated. Two-way randomized block design was used: the main treatment consisted of two [CO2] levels, ambient and enriched (400 and 800 +/- 40 mu mol mol(-1), respectively), and the minor treatment consisted on two salinity treatment levels, 0 and 80 mmol L-1 NaCl. The results showed that, under the experimental conditions, enriched [CO2] and salt stress significantly inhibited the N assimilation process in cucumber leaves; however, enriched [CO2] had no effect on the nitrate (NO3-) reduction or ammonium (NH4+) assimilation of leaves under salt stress, inhibiting only the transamination. Moreover, enriched [CO2] increased the plasma membrane H+-ATPase activity, vacuolar membrane H+-ATPase activity and root hydraulic conductivity under salt stress, thereby increasing the ion selective absorption and water absorption capacity. To a certain extent, enriched [CO2] promoted the accumulation of K+ in plants, which significantly reduced the Na+/K+ ratio; moreover, the enrichment ultimately improved the water state conditions and helped to maintain the ion balance in plants under stress, ensuring normal enzymatic activity.
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