Water loss and postharvest characteristics of cut roses grown at high or moderate relative air humidity

Stomatal Responses to Drought Stress and Air Humidity

“…When roses are cultivated in high relative humidity environments in greenhouses they develop large, malfunctioning stomata, similar as the malfunctioning stomata produced under in vitro conditions (Torre and Fjeld, 2001;Torre et al, 2003). When these plants are moved to a dryer environment the stomata are unable to close, which results in high water loss and less stress tolerant plants that quickly lose their ornamental value (Torre and Fjeld, 2001). The shorter shelf life of plants developed under high humidity is a major problem in the greenhouse industry.…”

“…Furthermore, much of the plant breeding is done in greenhouses, particularly when it comes to ornamentals. Roses developed under high relative humidity (>85%) have 6-8 days shorter shelf life and greater water loss than plants grown under lower humidities (Mortensen and Fjeld, 1998;Torre and Fjeld, 2001). When roses are cultivated in high relative humidity environments in greenhouses they develop large, malfunctioning stomata, similar as the malfunctioning stomata produced under in vitro conditions (Torre and Fjeld, 2001;Torre et al, 2003).…”

“…Roses developed under high relative humidity (>85%) have 6-8 days shorter shelf life and greater water loss than plants grown under lower humidities (Mortensen and Fjeld, 1998;Torre and Fjeld, 2001). When roses are cultivated in high relative humidity environments in greenhouses they develop large, malfunctioning stomata, similar as the malfunctioning stomata produced under in vitro conditions (Torre and Fjeld, 2001;Torre et al, 2003). When these plants are moved to a dryer environment the stomata are unable to close, which results in high water loss and less stress tolerant plants that quickly lose their ornamental value (Torre and Fjeld, 2001).…”

“…In these greenhouses the ventilation is reduced to a minimum, which consequently results in increased relative air humidity inside. This increase in air humidity affects the plants in different ways and might result in plants that are less tolerant to water stress (Torre and Fjeld, 2001). In this review different plant responses to water stress will be discussed, with most attention to drought and the role for abscisic acid (ABA) as a plant stress hormone.…”

Responses of Dendrobium 'darrenn glory' and Mokara 'calypso jumbo' orchids to 1-methylcyclopropene and aqueous ozone postharvest treatments

“…A high number of bacteria in the vase solution are mostly responsible for the vascular blockage (Kazemi & Ameri, 2012;Robinson et al, 2009). To inhibit microbial growth in the vase solutions, many chemicals have been tried such as silver nitrate (Torre & Fjeld, 2001), silver thiosulphate (Van Doorn, 1998), hydroxyquinoline citrate (Van Doorn, 1998), sodium hypoclorite (Torre & Fjeld, 2001) and aqueous ozone (Robinson et al, 2009).…”