Effects of salt stress on seed germination and respiratory metabolism in different Flueggea suffruticosa genotypes

PeerJ

article

Ningwei Xu¹  Bin Lu¹  Yang Wang²  Xiaoyue Yu¹  Nan Yao²  Qijuan Lin³  Xingyou Xu³  Bingshe Lu¹ 

[1]College of Landscape and Tourism, Hebei Agricultural University

[2]College of Horticulture Science & Technology, Hebei Normal University of Science & Technology

[3]College of Marine Resources & Environment, Hebei Normal University of Science & Technology

关键词: Flueggea suffruticosa;    Salt stress;    Germination;    Water absorption;    Respiratory metabolism;   

DOI  :  10.7717/peerj.15668

学科分类：社会科学、人文和艺术（综合）

来源: Inra

【 摘 要 】

The selection and utilization of ornamental plants that are highly tolerant to salt are helpful for landscape construction and the ecological protection of coastal and arid areas. To evaluate salt tolerance, one of the most used methods is the observation of seed germination under salt stress. Therefore, this work aimed to evaluate the influence of different concentrations of NaCl in water absorption, germination, and respiratory metabolism in seeds of different Flueggea suffruticosa genotypes. P2 and P27, salt-sensitive and salt-tolerant line s of F. suffruticosa, were chosen for treatment with 0, 40, 80, 120, 160, 200, and 240 mM NaCl. F. suffruticosa under salt stress exhibited inhibition of seed germination. The seeds of F. suffruticosa have different times for the physiological phases of water absorption with different NaCl concentrations. Salt stress retarded the seed water absorption process, and it depended on seed genotypes for F. suffruticosa. Soluble sugars accumulated in both P2 and P27 under salt stress. Meanwhile, the activities of hexokinase, 6-phosphofructokinase, pyruvate kinase, pyruvate dehydrogenase, citrate synthase, and glucose-6-phosphate dehydrogenase were overall increased in P27 after salt treatment, which caused increases in pyruvic acid and citric acid. The citrate synthase and glucose-6-phosphate dehydrogenase activities decreased in P2. These results suggest that the respiratory metabolism of salt-tolerant F. suffruticosa was enhanced, compared with the salt-sensitive line, to ameliorate the repression of seed germination under salt stress. The different changes in respiratory metabolism could influence the degree of salt tolerance.

【 授权许可】

CC BY