Growth and physiological responses of four kiwifruit genotypes to salt stress and resistance evaluation

Abstract

In this study, four genotypes (Acva-1, Acva-2, Acva-3 and ZM-2) of Actinidia germplasm resources were grown in different salt concentrations (0, 0.4, 0.8 and 1.2 g L-1 NaCl). The growth, physiological and biochemical indicators were measured, and a graded scale was developed as the salt damage index (SDI) according to different damage symptoms in leaves. The results showed SDI increased gradually, and average number and length of new shoot decreased significantly. Three antioxidant enzymes (superoxide dismutase, peroxidase and catalase) and two osmotic adjustment substances (soluble sugar and proline) showed different changes in old and new leaves of four genotypes. SPAD values exhibited a decreased trend in the whole except in the new leaf of Acva-2. Malonaldehyde contents increased and root activity decreased with the increasing salt concentrations. Principal component analysis was used to assess the salt tolerance, and the results showed Acva-3, from Actinidia valvata Dunn., had the strongest tolerance to salt, and could be a potential resistant resource to the salt-tolerance dedicated rootstock breeding of kiwifruit.

Growth responses and physiological and biochemical changes in five ornamental plants grown in urban lead‐contaminated soils

“…The development of CEV was based on the combination of the cluster analysis and standard deviation coefficient allocation weighted method described by Zhong et al. ( 2019 ) with modifications. Four steps were followed to calculate the CEV.…”

“…The CEV was used to figure out the most sensitive/tolerant ornamental plant species under different soil Pb treatments. The development of CEV was based on the combination of the cluster analysis and standard deviation coefficient allocation weighted method described by Zhong et al (2019) with modifications. Four steps were followed to calculate the CEV.…”

Carrot DcALFIN4 and DcALFIN7 Transcription Factors Boost Carotenoid Levels and Participate Differentially in Salt Stress Tolerance When Expressed in Arabidopsis thaliana and Actinidia deliciosa

“…To assess the biotechnological projection of DcAL s in commercial plants, we overexpressed DcAL4 and DcAL7 in kiwi ( A. deliciosa var Hayward). A. deliciosa is sensible to saline stress, showing a decrease in vegetative growth, accumulation of salts in the plant tissue, less development of the vegetative area and a lower photosynthetic yield under saline conditions [ 59 , 60 ]. Therefore, development of transgenic kiwi plants tolerant to salt stress could be a useful strategy to overcome this issue [ 61 ].…”

Combined transcriptomic and metabolomic analysis reveals a role for adenosine triphosphate-binding cassette transporters and cell wall remodeling in response to salt stress in strawberry

“…To do this, 100 ml of the salt solution was applied once per week, and the same volume of fresh water was applied in the control treatment. Plants salt damage index (SDI) was measured as described by Zhong et al (2021) , and the SDI grades were scaled into six levels from 0 to 5, according to different damage symptoms observed in the leaves after salt treatment. The classification standard of plant salt damage was as follows: Grade 0: no symptoms of salt damage; Grade1: about 1/3 of the leaves showed wilting phenotype at leaf tips and leaf margins; Grade 2: about 1/2 of the leaves showed wilting and burn phenotype at leaf tips and leaf margins; Grade 3: about 2/3 of the leaves showed burn phenotype and the burn area was about 1/3; Grade 4: all leaves showed burn phenotype and the burn area was more than 1/2; Grade 5: all leaves were scorched.…”