Pre-chilling promotes flowering in Paeonia lactiflora ‘Taebaek’ without flower bud abortion

Comprehensive Application of Different Methods of Observation Provides New Insight into Flower Bud Differentiation of Double-flowered Paeonia lactiflora ‘Dafugui’

“…They also found that the number of days to shoot induction in a greenhouse decreased significantly by delaying forcing time from early to late December. Park et al (2015) found that more than 85% of flower buds aborted when rootstocks were chilled at 0°C for 8 weeks before mid-September. Zhou (2012) studied the effects of different temperature regimes on 'Dafugui', and found that buds proceeded to the petal differentiation stage only when rootstocks were chilled at 0°C for 4 weeks, thereby promoting flowering without flower bud abortion.…”

“…Kamenetsky et al (2003) suggested that the best treatment to release dormancy of P. lactiflora 'Sarah Bernhardt' was 2°C for 60 d or 6°C for 70 d. Rhie et al (2012) found that chilling for 6 weeks at 0 and 9 weeks at 5°C was needed to break dormancy and to induce flowering in P. lactiflora 'Taebaek' and 'Mulsurae', respectively. Thus, the effectiveness of temperatures must be determined for the regulation of flowering for annual commercial production (Dole, 2003;Park et al, 2015).…”

“…Temperature is strictly correlated with flowering in the spring, as well as the geographic distribution of plants (Hall et al, 2007;Walton et al, 2007). The floral transition of plants and other developmental processes depend on changes in photoperiod and low temperature (Park et al, 2015;Zhao et al, 2012). Prolonged chilling before forcing at warm temperatures promotes the release of dormancy, but it is commonly accepted that low temperature is sensed by the shoot apical meristem only after the bud reaches a certain stage of development (Barzilay et al, 2002).…”

Evaluating the Comprehensive Performance of Herbaceous Peonies at low latitudes by the Integration of Long-running Quantitative Observation and Multi-Criteria Decision Making Approach

“…For example, the aborted flower number and OMA (Supplementary Tables S10 and S11) were two valuable morphologies but were not included in the evaluation system. The abortion of floral organs is a frequent and troublesome problem in peony cultivation and greatly inhibits flower production 20,57,58 . The number of aborted flowers would decrease, while healthy flowers would increase correspondingly if the environment was appropriate and the nutrient transformation was normal.…”

“…Compared with the hot summer, the warm winter causes more profound and multiple negative influences to herbaceous peony 3,10 . Warming winters hinder the fulfillment of the chilling requirement (CR), which is a decisive trait for both herbaceous and tree peonies that are to be successfully planted in low latitudes 1,24,58,65,66 . The lack of chilling accumulation during the last winter negatively affects all subsequent growth and development in the following spring, such as an incomplete overwintering bud dormancy release, uneven sprouting, abnormal growth and poor blooming 3,25,57,66,67 .…”