Abstract
Amongst the various abiotic stresses, cold is an essential factor that limits crop productivity worldwide. Low temperature affects the growth, development, and distribution of agronomic species around the world. To improve the understanding of the physiological and genetic properties and functions affecting potato cold tolerance, in this study, transcriptomic analysis was performed on two potato cultivars (HZ88 and LS6) with different cold tolerances that were treated at low temperature for 0, 1, 3, and 6 h. Transcriptomic analysis showed large differences between HZ88 and LS6 regarding the expression levels of low-temperature responsive genes. Notably, HZ88 responds to low-temperature stress via genes primarily enriched in plant hormone signal transduction, cutin, suberine, and wax biosynthesis, and photosynthesis-antenna proteins. By comparison, the most significant low-temperature responsive genes of LS6 were determined to be enriched in plant-pathogen interactions, zeatin biosynthesis, and plant hormone signal transduction. The cuticle, a horny waxy layer, is an important protective barrier formed by plants to resist biotic and abiotic stresses during the long-term ecological adaptation. This may be a physical defence employed by HZ88 to strengthen its cold resistance. In the LS6 cultivar, potatoes tend to cope with cold stress by strengthening their immune system and regulating hormone signal transduction. In addition, hormone pathway-related genes such as ABA, ICE-CBF signalling pathway-related genes, and genes encoding transcription factors all exhibited different expression patterns between HZ88 and LS6. To the best of our knowledge, this study is the first to elucidate the genetic mechanisms underlying the differences in cold resistance between the cold-tolerant LS6 and cold-sensitive HZ88, thereby establishing the foundation for further analysis and genetic breeding of potatoes.
Abstract
Amongst the various abiotic stresses, cold is an essential factor that limits crop productivity worldwide. Low temperature affects the growth, development, and distribution of agronomic species around the world. To improve the understanding of the physiological and genetic properties and functions affecting potato cold tolerance, in this study, transcriptomic analysis was performed on two potato cultivars (HZ88 and LS6) with different cold tolerances that were treated at low temperature for 0, 1, 3, and 6 h. Transcriptomic analysis showed large differences between HZ88 and LS6 regarding the expression levels of low-temperature responsive genes. Notably, HZ88 responds to low-temperature stress via genes primarily enriched in plant hormone signal transduction, cutin, suberine, and wax biosynthesis, and photosynthesis-antenna proteins. By comparison, the most significant low-temperature responsive genes of LS6 were determined to be enriched in plant-pathogen interactions, zeatin biosynthesis, and plant hormone signal transduction. The cuticle, a horny waxy layer, is an important protective barrier formed by plants to resist biotic and abiotic stresses during the long-term ecological adaptation. This may be a physical defence employed by HZ88 to strengthen its cold resistance. In the LS6 cultivar, potatoes tend to cope with cold stress by strengthening their immune system and regulating hormone signal transduction. In addition, hormone pathway-related genes such as ABA, ICE-CBF signalling pathway-related genes, and genes encoding transcription factors all exhibited different expression patterns between HZ88 and LS6. To the best of our knowledge, this study is the first to elucidate the genetic mechanisms underlying the differences in cold resistance between the cold-tolerant LS6 and cold-sensitive HZ88, thereby establishing the foundation for further analysis and genetic breeding of potatoes. Leer más
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