Dual induction rather than intermediate daylength response of flowering in <i>Echinacea purpurea</i>

Heide, Ola M.

doi:10.1111/j.0031-9317.2004.0228.x

Cited by 6 publications

(3 citation statements)

References 7 publications

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“…Although all these three species technically qualify for the classification as intermediate daylength plants, the underlying interference with dormancy renders such a classification rather artificial. The rationale for maintaining intermediate day length plants as a specific and genuine flowering response group has been seriously challenged also for other reasons [12].…”

Section: Examples Of Interference Between Dormancy and Flowering Indumentioning

confidence: 99%

Dormancy Interferes with Flowering in Perennial Plants with Short Day Regulation of Both Processes: A Mini-Review

Heide¹,

Sønsteby²

2015

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In many perennial woody plants growing in the temperate and cold regions, regulation of seasonal growth cessation and floral initiation are closely integrated, both taking place in photoperiods shorter than a critical length. In the temperate shrub black currant (Ribes nigrum L.), the two processes proceed harmoniously in parallel under naturally decreasing autumn photoperiods, whereas an abrupt shift to photoperiods well below the critical length results in an immediate growth cessation and premature dormancy. As a result, floral initiation is suppressed and arrested. Other perennial plants such as hop (Humulus lupulus), which have the same dual short day responses, behave in the same way. In such plants, optimal flowering takes place at near-critical photoperiods, which are short enough to induce flowering and still long enough to prevent premature dormancy. These responses deviate from the situation in annual plants, which have predominated in studies on photoperiodic control of flowering. Another example of linkage between flowering and dormancy responses is the well-known dual effects of chilling temperature on vernalization and its relation to dormancy. Elucidation and disentangling of these networks of integrated processes are now awaiting joint research efforts in the areas of molecular genetics and experimental plant physiology.

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Section: Examples Of Interference Between Dormancy and Flowering Indumentioning

confidence: 99%

Dormancy Interferes with Flowering in Perennial Plants with Short Day Regulation of Both Processes: A Mini-Review

Heide¹,

Sønsteby²

2015

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“…A dual daylength requirement for sequential SD and LD, or LD and SD enables a plant to distinguish between spring and autumn when photoperiodic conditions are identical. Because the sequence of inductive conditions is crucial, dual induction photoperiodic plants will not flower in either constant SD or constant LD conditions and, hence, they are distinct from daylength neutral species (Heide 2004). Such a dual daylength response is also not to be confused with intermediate daylength responses where LD and SD inputs may be satisfied simultaneously (Runkle et al 2001).…”

Section: The Regulation Of Flowering Involves Multiple Adaptations Tomentioning

confidence: 99%

Seasonal flowering and evolution: the heritage from Charles Darwin

King

Heide

2009

Functional Plant Biol.

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Abstract. To survive, plants optimise their seasonal flowering time and set seed to avoid extremes of the environment including frost, heat and drought. Additionally, pollination may need to be tightly regulated in time so that it coincides with flowering of other individuals and/or with the presence of bird or insect pollinators. It is now clear that plants use seasonal changes in natural light intensity, daylight duration and temperature to achieve reproducible timing of flowering year-inyear-out. In more recent studies, genetic and molecular approaches are beginning to provide a basis for understanding heritability, an essential component of Darwin's concept of evolution.

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“…Flowering requirements of Hatiora are comparable to a number of noncactus plants. Other plants with similar short-long-day flowering activity in which SD may be replaced or enhanced by vernalization include Campanula medium (Wellensiek, 1960(Wellensiek, , 1985, Coreopsis grandflora (Ketellapper and Barbaro, 1966;Runkle, 1996), Echinacea purpurea (Heide, 2004), Dactylis glomerata (Heide, 1987), Festuca rubra (Heide, 1990), and other temperate grasses (Heide, 1994). The critical temperature for heading in Festuca pratensis was 15°C under SD and 12°C under LD (followed by LD) (Heide, 1988), which is very similar to Hatiora.…”

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Daily Light Integral, Prevernalization Photoperiod, and Vernalization Temperature and Duration Control Flowering of Easter Cactus

Rohwer¹,

Heins²

2007

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Experiments were performed on Hatiora gaertneri (Regel) Barthlott ‘Jan’ and ‘Rood’ and H. ×graeseri (Wedermann) Barthlott ‘Evita’ to determine their flowering responses to 1) daily light integral (DLI) before and during vernalization; 2) 0 to 6 weeks of short-day (SD) or long-day (LD) photoperiods before vernalization at 10, 12.5, or 15 °C; 3) propagation from April to July; 4) timing of leveling before or during inductive treatments; and 5) SD photoperiods before vernalization under darkness at 0 to 10 °C. ‘Jan’ grown under elevated DLI before vernalization and low DLI during vernalization flowered more prolifically than plants grown under low DLI before vernalization or high DLI during vernalization at 15 °C. Six weeks of SD photoperiods before vernalization increased the number of buds per flowering phylloclade after vernalization at 10 °C and increased flowering uniformity when vernalization duration was insufficient at 10 °C or vernalization temperature was 12.5 or 15 °C. For plants flowering in January, propagation the previous April produced better flowering than propagation in May, June, or July. Removal of apical phylloclades during prevernalization SD or during vernalization was deleterious to flowering. Vernalization in the dark produced marginal flowering, but SD treatment before vernalization increased the percentage of apical phylloclades flowering, buds per flowering apical phylloclade, and percentage of plants flowering after dark vernalization. ‘Evita’ flowered more poorly than either ‘Jan’ or ‘Rood’. Collectively, the most uniform flowering in January occurred when plants were exposed to a sequence of 4 to 6 weeks of SD, vernalization at 7.5 to 15 °C for 8 weeks, then growth under LD for 7 weeks.

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Dual induction rather than intermediate daylength response of flowering in Echinacea purpurea

Cited by 6 publications

References 7 publications

Dormancy Interferes with Flowering in Perennial Plants with Short Day Regulation of Both Processes: A Mini-Review

Dormancy Interferes with Flowering in Perennial Plants with Short Day Regulation of Both Processes: A Mini-Review

Seasonal flowering and evolution: the heritage from Charles Darwin

Daily Light Integral, Prevernalization Photoperiod, and Vernalization Temperature and Duration Control Flowering of Easter Cactus

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