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- Title
Physiological and Biochemical Responses of Peach Self-rooted Rootstock to NaCl and Analysis of Salt Tolerance Threshold.
- Authors
ZHANG Fan; WANG Hong; ZHANG Xuebing; CHEN Jianjun
- Abstract
In order to explore the growth and physiological and biochemical responses of the peach self-rooted rootstock under NaCl stress and determine the salinity tolerance threshold, the cutting seedlings of one-year-old 5 rootstocks were treated with different NaCl contents (0.2%, 0.4% and 0.6% NaCl). The results showed that, with the increase of NaCl content, the activity of superoxide dismutase (SOD) and content of malondialdehyde (MDA) increased. With the increase of NaCl content, the activity of peroxidase (POD) increased first and then decreased in Li 1 and Li 3, while decreased first and then increased in Li 5 and GF677, and showed increasing trend in RA. With the increase of NaCl content, the activity of catalase (CAT) showed increasing trend in Li 1, Li 3 and RA, showed decreasing trend in Li 5, and increased first and then decreased in GF677. The content of Pro increased in Li and RA, decreased first and then increased in Li 3 and Li 5, and increased first and then decreased in GF677. The content of soluble sugar increased in Li 3 and Li 5, increased first and then decreased in Li 1 and RA, and decreased first and then increased in GF677. The correlation analysis showed that Na+ content was positively related to NaCl content in media, while K+ content was negative correlation with NaCl content. The Na+/K+ was the highest in Li 1, while was the lowest in GF677. Under NaCl stress, the chlorophyll synthesis of 5 peach rootstocks was significantly inhibited. Fluorescence kinetic parameters and light energy absorption, capture and transfer parameters were reduced, and the curve of OJIP changed with the decrease of J, I, P phases and ΔK<0. Considering net photosynthetic rate (Pn) as a tolerance index, the salt tolerance thresholds of Li 1, Li 3, Li 5, RA and GF677 were 0.37%, 0.43%, 0.38%, 0.46% and 0.49% NaCl, respectively. According to comprehensive membership function, salt tolerance coefficient index and salt tolerance thresholds resistance, the salt tolerance showed GF677>RA>Li 3> Li 5>Li 1.In summary, self rooting stocks of peach adapted to salt stress mainly through active oxygen scavenging and osmotic adjustment mechanisms, rootstocks with high salt tolerance could better stabilize the photosynthetic reaction center and alleviate the damage of salt stress to their photosynthetic system, which provided theoretical support for revealing the mechanism of salt tolerance and screening the varieties of peach rootstock with high salt tolerant.
- Subjects
EFFECT of salt on plants; PEACH; PHOTOSYNTHETIC reaction centers; ROOTSTOCKS; SALT; SUPEROXIDE dismutase; MEMBERSHIP functions (Fuzzy logic)
- Publication
Journal of Agricultural Science & Technology (1008-0864), 2023, Vol 25, Issue 11, p70
- ISSN
1008-0864
- Publication type
Article
- DOI
10.13304/j.nykjdb.2023.0271