Potassium contributes to zinc stress tolerance in peach (Prunus persica) seedlings by enhancing photosynthesis and the antioxidant defense system.
Zinc (Zn) is considered to be a major industrial pollutant because excessive amounts can impair plant growth. In this paper, we found that peach 'Yoshihime' seedlings are promising Zn tolerant plants. However, heavy Zn toxicity (2 mM) damaged plant performance by disrupting biochemical processes, including photosynthesis, proline production, and K(+) nutrition. Notably, elevated external K(+) supply (10 mM) alleviated peach seedlings from Zn toxicity, evidenced by enhanced photosynthesis, antioxidant defense systems, and plant K(+) nutritional status. Moreover, the transcript levels of KUP (K(+) uptake) genes involved in K(+) acquisition, transport, and homeostasis were significantly upregulated following supply of sufficient K(+) upon Zn toxicity. In general, K(+) favorably contributes to improvements in internal K(+) homeostasis, via the help of K(+) transporters, further protecting plant photosynthesis and the antioxidative defense system. Our findings further benefit the study of the mechanisms underpinning heavy metal tolerance in woody plants.
Institute of Horticulture, Jiangsu Academy of Agricultural Sciences, Nanjing, China szhzh2000@163.com.
Z Z
ZZ
Song
Jiangsu Provincial Fishery Technical Extending Center, Nanjing, China.
C L
CL
Duan
Institute of Horticulture, Jiangsu Academy of Agricultural Sciences, Nanjing, China.
S L
SL
Guo
Institute of Horticulture, Jiangsu Academy of Agricultural Sciences, Nanjing, China.
Y
Y
Yang
Institute of Agricultural Resources and Environment, Jiangsu Academy of Agricultural Sciences, Nanjing, China.
Y F
YF
Feng
Institute of Horticulture, Jiangsu Academy of Agricultural Sciences, Nanjing, China.
R J
RJ
Ma
Institute of Horticulture, Jiangsu Academy of Agricultural Sciences, Nanjing, China.
M L
ML
Yu
D000975:Antioxidants / Q000378:metabolism*; D000075322:Heavy Metal Poisoning; D010788:Photosynthesis; D018515:Plant Leaves / Q000187:drug effects / Q000254:growth & development; D018517:Plant Roots / Q000187:drug effects / Q000254:growth & development; D011041:Poisoning; D011188:Potassium / Q000378:metabolism*; D000068239:Prunus persica / Q000187:drug effects / Q000378:metabolism; D036226:Seedlings / Q000187:drug effects / Q000378:metabolism*; D013312:Stress, Physiological / Q000187:drug effects / Q000235:genetics*; D015032:Zinc / Q000633:toxicity
D000975:Antioxidants; D015032:Zinc; D011188:Potassium