Effects of NaCl Stress on Growth and Eco-physiological Characteristics of Different Okra Genotype in Seedlings

doi:10.7668/hbnxb.2016.06.017

Abstract

Abstract: In order to clarify the difference response of okra growth under salt stress at seedling stage, Two okra cultivars (genotypes:HXWJ salt tolerant and LXWJ salt sensitive) were subjected to different NaCl concentrations (0,80,160 mmol/L) for various periods of time to determine the effects on seedling growth and physiological and ecological index in soil pot culture.The results showed that plant length,root length,leaf,cell membrane stability index(CMSI),K⁺ content,K⁺/Na⁺ of okra were reduced,while malondialdehyde (MDA) content,Na⁺ content was enhanced with NaCl concentration increasing.Fresh weight of okra seedlings was more sensitive to salt stress as compared to dry weight,shoots were more sensitive as compared to roots.The activities of superoxide dismutase (SOD) and peroxidase (POD) increased with the increase of NaCl concentrations at the 25th day, which increased firstly and then decreased at the 50th day. High plant height,root length,plant fresh weight,K⁺ content,the decrease range of K⁺/Na⁺ ratio and the increase range of MDA content was observed in HXWJ as compared to LXWJ during NaCl-stressed period,which suggested that greater biomass,higher cell membrane stability and higher tissue K⁺ accumulation at seedling stage could be considered as the physiological characteristics in NaCl tolerant genotypes of okra.

Key words: NaCl, Okra, Growth, Eco-physiological

CLC Number:

S649.01

WANG Yonghui, CHEN Jianping, ZHANG Peitong, GAO Jin, ZHOU Chunlin, SHI Qinghua, ZHOU Ruqin. Effects of NaCl Stress on Growth and Eco-physiological Characteristics of Different Okra Genotype in Seedlings[J]. ACTA AGRICULTURAE BOREALI-SINICA, 2016, 31(6): 105-110. doi: 10.7668/hbnxb.2016.06.017.

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