Quantifying Temperature-controlled Leaf Unfolding Rates in ‘Nellie White’ Easter Lily

Abstract

The rate of leaf unfolding was determined for Easter lily (Lilium longiflorum Thunb.) ‘Nellie White’ grown at day and night temperatures ranging from 14° to 30°C. In this temperature range, rate of leaf unfolding was a linear function of average daily temperature; i.e., the effect on rate of leaf unfolding for day temperature was the same as for night temperature. The function determined was: leaves unfolded per day = −0.1052 + (0.0940 × average daily temperature). Isopleth plots were developed to describe day and night temperatures required for specific rates of leaf unfolding under 8-, 10-, and 12-hr day temperature periods.

Quantitative Inheritance of Crop Timing Traits in Interspecific Hybrid Petunia Populations and Interactions with Crop Quality Parameters

“…Petunia species produce a single leaf per node, therefore node appearance rate and leaf unfolding rate can be used interchangeably as quantifications of development rate. Leaf unfolding rate is temperature responsive, increasing with higher temperatures up to a genotype-specific maximum temperature (Tollenaar et al 1979;Karlsson et al 1988Karlsson et al , 1989Truong and Duthion 1993) and declining if temperature exceeds the maximum. However, different species and even different cultivars of a species exhibit different rates at the same temperature (Tollenaar et al 1984;Padilla and Otegui 2005), suggesting that it should be possible to breed for individuals with faster development rate.…”

Temperature and Photosynthetic Photon Flux Influence Chrysanthemum Shoot Development and Flower Initiation under Short-day Conditions

“…This rate of increase in leaf unfolding per I o increase in ADT is comparable to pea with 0.020 leaves/°C per day (Balvoll and Bremer, 1965) and to sunflower with 0.022 leaves/°C per day (Rawson and Hindmarsh, 1982). However, the rate of leaf unfolding was five times slower than Easter lily at 0.094 leaves/ °C per day (Karlsson et al, 1988) and four times slower than maize at 0.067 leaves/°C per day (Tollenaar et al, 1979).…”

“…Rate of leaf appearance in several species has been found to increase linearly to a maximum rate as temperature increases (Friend et al, 1962;Balvoll and Bremer, 1965;Tollenaar et al, 1979;Rawson and Hindmarsh, 1982;Karlsson et al, 1988). Cockshull et al (1981) reported that leaf appearance in chrysanthemum was also an average daily temperature (ADT) response.…”