Physiological response and ecological adaptability of different Jerusalem artichoke genotypes to salt stress

doi:10.11686/cyxb2017304

Abstract

Abstract: The physiological and ecological adaptability of different genotypes of Jerusalem artichoke were analyzed to measure the responses of their morphology, antioxidant enzymes and endogenous hormones to salt stress. This study provides a theoretical basis for both varieties selection and ecological planting. Using the eurytopic varieties of Southern Jerusalem artichoke No.1 (N1) and Puyang Henan (M1) as experimental materials, two salt-stressed treatments of 100 mmol·L^-1 NaCl (low salt level) and 200 mmol·L^-1 NaCl (high salt level) were laid out in a randomized complete block design with 3 replications in each case. The results showed that: 1) Salt stress significantly inhibited seedling growth in Jerusalem artichoke, resulting in plant dwarfing, stunted root growth and a dry matter decrease of M1 and N1. 2) Salt stress did not affect the synthesis of chlorophyll-a, chlorophyll-b and total chlorophyll in M1 (except for chlorophyll-a under 200 mmol·L^-1 NaCl stress), but it blocked photosynthetic pigment synthesis in N1. 3) Low salt stress significantly increased superoxide dismutase (SOD), peroxidase (POD) and catalase (CAT) activities in M1 and N1, while high salt stress markedly decreased enzyme activities in N1 and had no effect on enzyme activities in M1 (except for CAT). 4) Low salt stress promoted the synthesis of GA₃ (gibberellin) and ABA (abscisic acid) in N1, but IAA (indoleacetic acid) content was relatively stable and endogenous hormone content in M1 was not obviously changed. High salt stress decreased the content of IAA and GA₃ in N1, but there was no obvious change in ABA. The content of GA₃ in M1 increased, while IAA and ABA were relatively stable. The differences in salt tolerance between the Jerusalem artichoke genotypes were significant (M1>N1), and the internal adaptation of antioxidant enzymes and endogenous hormones could improve the plant’s ecological adaptability to salt stress.

Key words: jerusalem artichoke (Helianthus tuberosus), photosynthetic pigment, enzymes, hormones, ecological adaptability

ZHU Ju-hua, SUN Xing, XU Bing, LIANG Ting, LIU Ming, MIAO Jian, ZHAO Geng-mao. Physiological response and ecological adaptability of different Jerusalem artichoke genotypes to salt stress[J]. Acta Prataculturae Sinica, 2018, 27(6): 120-127.

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