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首页> 外文期刊>Acta Horticulturae >Root zone temperature effects on potted Dahlia production
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Root zone temperature effects on potted Dahlia production

机译：根区温度效应盆栽大丽花生产

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摘要

Dahlias (Dahlia x hybrida) have been a popular greenhouse crop in recent years, as increased dahlia breeding and selection has led to a new generation of dahlias, with enhanced disease resistance, leading the way for a renewed interest in the horticulture market. Vegetative or clonal dahlia production has become more popular with many new dahlia series available to producers and consumers (e.g. 'XXL', 'Karma', 'Gallery', 'Dahlietta', 'Dalaya', etc.). It has been observed and reported that periodic significant crop loss (complete crop loss in some cases) of vegetative dahlia crops during greenhouse production in North America in late spring, shortly before market. It is hypothesized that elevated root zone temperatures (RZT) may be to cause, rather than disease problems. The main objective of this research was to evaluate and characterize elevated RZT effects on vegetative dahlia production on different dahlia lines and cultivars. Elevated RZT treatments were applied using a hot water bath. Dahlia plants (6 replications) were subjected to one of 5 RZT treatments; 18 (control; ambient), 35, 40, 45, or 50°C. Plants were treated 5 weeks after plugs were transplanted, when significant rooting was observed. Treatments were considered 'applied' when thetemperature in the root zone of the pot (~2.5 cm from the edge of the pot; ~5 cm from the top of the media). Root ratings based on a predetermined scale (0=brown, dead; 4=white, active) were collected before treatments were applied and weekly after treatments. Our results showed that temperature affects were cultivar dependent. One week after treatment, with the exception of the controls, for most temperature treatments, root ratings decreased in 'Dalaya Shiva', 'XXL Sunset', and 'Dalaya Yogi'. The cultivar XXL Veracruz did not respond to treatments. For 'Karma Naomi', 'Karma Sangria', 'Melody Gypsy' and 'Melody Sincerity', RZT treatments of 45 and 50°C resulted in decreased root ratings, one week post treatment. After 2 and 3 weeks, some root ratings increased, indicating root recovery across the treatments. These results provide insight into the effects of elevated RZTs. However, treatments did not result in complete crop losses, suggesting additional factors need to be considered to explain the phenomenon.
机译：大丽亚（大丽花X Hybrida）近年来一直是一个受欢迎的温室作物，因为大丽花养殖和选择增加了新一代大丽花，具有增强的疾病抵抗，导致在园艺市场的重新兴趣。植物人或克隆大丽花生产变得更加受欢迎，众多新的大丽花系列可供生产者和消费者（例如'XXL'，'Karma'，'画廊'，'Dahlietta'，'Dalaya'等）。已经观察到并报道了在春季北美北美北美的温室生产期间，营养大丽花作物的定期显着的作物丧失（完全作物损失）在春季延迟市场前期市场。假设升高的根区温度（RZT）可能是引起而不是疾病问题。本研究的主要目标是评估和表征对不同大丽花系和品种的植物大丽花产量的RZT影响升高。使用热水浴施加升高的RZT处理。大麻植物（6次复制）受到5个RZT治疗中的一种; 18（控制;环境），35,40,45或50℃。在观察到显着生根时，塞子被移植后5周处理植物。当罐的根区域中的温度（距离罐边缘〜2.5厘米〜2.5厘米的〜2.5厘米;距离介质顶部的〜5厘米）时被认为是“施用”。在处理处理之前收集基于预定刻度（0 =棕色，死亡; 4 =白色，活性）的根额定值。我们的研究结果表明，温度影响依赖于品种。治疗后一周后，除了对照组，对于大多数温度治疗，在'Dalaya Shiva'，'XXL日落'和'Dalaya Yogi'中，根部率降低。品种XXL Veracruz没有响应治疗。对于'Karma Naomi'，'Karma Sangria'，'旋律吉普赛人'和'旋律真诚'，45和50°C的RZT治疗导致了根本降低，治疗后一周。 2至3周后，一些根部评级增加，表明在治疗中的根本恢复。这些结果提供了对升高的RZT的影响。然而，治疗没有导致完全的作物损失，表明需要考虑额外的因素来解释这种现象。

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