Physiological responses and differential expression of cold resistance-related genes of six varieties of Magnoliaceae under low temperature stress

Ruixue, 李瑞雪 Li; Xiaoling, 金晓玲 Jin; Xijun, 胡希军 Hu; Jieming, 汪结明 Wang; Feng, 罗峰 Luo; Fangjing, 张方静 Zhang

doi:10.5846/stxb201801230185

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“…Low temperature is not only an abiotic stress but also an environmental signal necessary for plant growth (Li, Jin, et al, 2019) which plays a major regulatory role in the initiation, maintenance, and release of bud dormancy in perennial trees and is one of the most important environmental factors regulating perennial trees (Campoy et al, 2011). Japanese apricot is a subtropical deciduous fruit tree.…”

Section: Introductionmentioning

confidence: 99%

Allelic variation of PmCBF03 contributes to the altitude and temperature adaptability in Japanese apricot (Prunus mume Sieb. et Zucc.)

Huang,

Gao,

Zhou

et al. 2024

Plant Cell & Environment

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Japanese apricot is an important subtropical deciduous fruit tree in China, widely distributed in different altitude areas. How does it adapt to the different temperature environments in these areas? In this study, we identified a low‐temperature transcription factor PmCBF03 on chromosome 7 through adaptive analysis of populations at different altitudes, which has an early termination single nucleotide polymorphism mutation. There were two different types of variation, PmCBF03A type in high‐altitude areas and PmCBF03T type in low‐altitude areas. PmCBF03A gene increased the survival rate, Fv/Fm values, antioxidant enzyme activity, and expression levels of antioxidant enzyme genes, and reducing electrolyte leakage and accumulation of reactive oxygen species in transgenic Arabidopsis under low temperature and freezing stress. Simultaneously, PmCBF03A gene promoted the dormancy of transgenic Arabidopsis seeds than wild‐type. Biochemical analysis demonstrated that PmCBF03A directly bound to the DRE/CRT element in the promoters of the PmCOR413, PmDAM6 and PmABI5 genes, promoting their transcription and enhanced the cold resistance and dormancy of the overexpressing PmCBF03A lines. While PmCBF03T gene is unable to bind to the promoters of PmDAM6 and PmABI5 genes, leading to early release of dormancy to adapt to the problem of insufficient chilling requirement in low‐altitude areas.

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Section: Introductionmentioning

confidence: 99%