ArticleBMC plant biology2025
Deciphering the ecodormancy and survival strategies of tropical water lily in northern subtropical environments.
Article in BMC plant biology, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
backgroundTropical water lilies, vital aquatic ornamental plants, face significant challenges in overwintering outdoors in northern subtropical climates, which limits their ornamental and application values. This study investigates the mechanisms underlying the survival and adaptation strategies of tropical water lilies Nymphaea 'Eldorado', during cold periods, focusing on physiological, morphological, and ecological responses.
resultOur research findings reveal that 'Eldorado' tubers, regardless of their ecodormancy state, can swiftly resume growth under favorable temperature conditions, indicating that the dormancy pattern of 'Eldorado' is characterized by ecodormancy. Investigations using paraffin sectioning of 'Eldorado' tubers demonstrate that accelerated cortical cell division and increased starch granule accumulation contribute to tuber enlargement for entering ecodormancy. Low-temperature experiments reveal that mid-ecodormant tubers of tropical water lilies are less cold-tolerant than fully ecodormant ones; after one month underwater at 4 °C, mid-ecodormant tubers showed no sprouting within seven days, while fully ecodormant tubers had an 80% sprouting rate after two months. Transcriptomic analysis of tubers at various ecodormancy stages revealed that differentially expressed genes are enriched in pathways related to secondary metabolite biosynthesis and plant hormone signaling. Combined with hormone content analysis, we propose that ABA, GA, JA, ETH, and BR are key factors inducing ecodormancy in 'Eldorado'. Shortened photoperiod treatments effectively induced ecodormancy, with treated tubers showing greater enlargement and starch content compared to controls, alongside reduced new leaf count and soluble sugar content, indicating enhanced growth and nutrient accumulation. Furthermore, under a 5-hour light/19-hour dark photoperiod, the application of 100 µM JA significantly promoted tuber enlargement, while 50 µM ABA facilitated moderate enlargement, simultaneously supporting the induction of ecodormancy.
conclusionThese findings deepen our understanding of plant dormancy and propose strategies to improve the overwinter survival and reproductive success of tropical water lilies in non-native climates, with implications for horticultural practices and biodiversity conservation.
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