‘Vip Green’ and ‘Vip Red’ – two new registered kiwiberry (Actinidia arguta) cultivars

The aim of this study was to assess the enzymatic and non-enzymatic antioxidant status of kiwiberry (Actinidia arguta) leaf under different N regimes tested three times in field conditions during the 2015 growing season in two cultivars (‘Weiki’ and ‘Geneva’). Leaf total antioxidant capacity using ABTS, DPPH and FRAP tests was evaluated in the years 2015 to 2017, which experienced different weather conditions. Both cultivars exhibited a significant fall in leaf L-ascorbic acid (L-AA) and reduced glutathione (GSH) as well as global content of these compounds during the growing season, while total phenolic contents slightly (‘Weiki’) or significantly (‘Geneva’) increased. There was a large fluctuation in antioxidative enzyme activity during the season. The correlation between individual antioxidants and trolox equivalent antioxidant capacity (TEAC) depended on the plant development phase. The study revealed two peaks of an increase in TEAC at the start and end of the growing season. Leaf L-AA, global phenolics, APX, CAT and TEAC depended on the N level, but thiol compounds were not affected. Over the three years, TEAC decreased as soil N fertility increased, and the strength of the N effect was year dependent. The relationship between leaf N content and ABTS and FRAP tests was highly negative. The antioxidant properties of kiwiberry leaves were found to be closely related to the plant development phase and affected by soil N fertility.

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The complete chloroplast genome sequence of Actinidia arguta var. giraldii

Mitochondrial DNA Part B ◽

10.1080/23802359.2020.1870884 ◽

2021 ◽

Vol 6 (2) ◽

pp. 413-414

Author(s):

Fangbing Ding ◽

Lei Zhang ◽

Yaling Wang ◽

Yongpeng Wu ◽

Fengwei Wang ◽

...

Keyword(s):

Chloroplast Genome ◽

Genome Sequence ◽

Complete Chloroplast Genome ◽

Actinidia Arguta ◽

Chloroplast Genome Sequence

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The AaCBF4-AaBAM3.1 module enhances freezing tolerance of kiwifruit (Actinidia arguta)

Horticulture Research ◽

10.1038/s41438-021-00530-1 ◽

2021 ◽

Vol 8 (1) ◽

Author(s):

Shihang Sun ◽

Chungen Hu ◽

Xiujuan Qi ◽

Jinyong Chen ◽

Yunpeng Zhong ◽

...

Keyword(s):

Cold Stress ◽

Freezing Tolerance ◽

Luciferase Reporter ◽

Dna Interactions ◽

Functional Protein ◽

Actinidia Arguta ◽

Protein Dna Interactions ◽

Similar Phenotype ◽

Reporter Assays

AbstractBeta-amylase (BAM) plays an important role in plant resistance to cold stress. However, the specific role of the BAM gene in freezing tolerance is poorly understood. In this study, we demonstrated that a cold-responsive gene module was involved in the freezing tolerance of kiwifruit. In this module, the expression of AaBAM3.1, which encodes a functional protein, was induced by cold stress. AaBAM3.1-overexpressing kiwifruit lines showed increased freezing tolerance, and the heterologous overexpression of AaBAM3.1 in Arabidopsis thaliana resulted in a similar phenotype. The results of promoter GUS activity and cis-element analyses predicted AaCBF4 to be an upstream transcription factor that could regulate AaBAM3.1 expression. Further investigation of protein-DNA interactions by using yeast one-hybrid, GUS coexpression, and dual luciferase reporter assays confirmed that AaCBF4 directly regulated AaBAM3.1 expression. In addition, the expression of both AaBAM3.1 and AaCBF4 in kiwifruit responded positively to cold stress. Hence, we conclude that the AaCBF-AaBAM module is involved in the positive regulation of the freezing tolerance of kiwifruit.

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