Studies on the flower bud differentiation and development in some ornamental trees and shrubs. V

Kosugi, K.; Kondo, Hideo

doi:10.2503/jjshs.23.264

Cited by 5 publications

(4 citation statements)

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“…In this study, 'Masja' and 'Rosea' were selected as representative cultivars with low and high potential for unseasonal flowering occurrence, respectively. Using these cultivars, floral initiations in axillary dormant buds that developed on the basal part of the plants were studied for floral initiation in November 2018 by dissecting them under a stereomicroscope, and the developmental stage of each apical meristem was determined according to Kosugi and Arai (1960) and Kitamura et al (2018) as follows. 0: vegetative; 1: initial primordium developed; 2: secondary inflorescence branched; 3: tertiary inflorescence branched; 4: quaternary inflorescence branched; 5: highly branched inflorescence.…”

Section: Floral Initiation In Axillary Buds Expected To Develop Into mentioning

confidence: 99%

Relation Between Floral Initiations on Apical Buds of Basal Shoots After the Autumn and Cultivar Differences in Unseasonal Flowering of Hydrangea

2020

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Typically, hydrangea (Hydrangea spp.) plants produce flowers from early to midsummer. However, their basal shoots often continue to produce flowers from late summer to autumn, and we call this unseasonal flowering. The flowering frequencies and flowering period durations of basal shoots were studied using 23 hydrangea cultivars and lines in 2017, 2018, and 2019. The flowering frequencies of basal shoots were relatively high in 'Christmas', 'Endless Summer', 'Ezo', 'Rosea', and 'Sumida-no-hanabi' in each year of the study. The flowering period durations of basal shoots ranged from one to six months among the cultivars and lines studied. Basal shoots of 'Endless Summer' and 'Rosea' continuously flowered during each year of the study period. The basal shoots of 'Hatsushimo', 'Jyogasaki', 'Maihime', 'Masja', 'Ms. Hepburn', 'Uzu', and No. 5 never flowered after August in any of the study years. Using 'Masja' and 'Rosea', axillary buds expected to develop into basal shoots were studied for flower bud initiation in November 2018. Flower bud initiation was observed in 8.9% and 77.4% of axillary buds of 'Masja' and 'Rosea', respectively. The number of nodes produced before flower bud initiation in the buds ranged from 10 to 12 and 8 to 13 in 'Masja' and 'Rosea', respectively. The numbers of nodes corresponded to those of the basal shoots that flowered up to August 2019 in both cultivars. The number of nodes produced by basal shoots of 'Rosea' that flowered after August 2019 ranged from 14 to 19, which was higher than those observed for the axillary buds expected to develop into basal shoots in November 2018. In conclusion, the flowering period duration of hydrangea basal shoots differs among cultivars. The floral initiations on the apical buds of the basal shoots after the previous autumn largely contribute to unseasonal flowering occurrences after August in hydrangea.

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Section: Floral Initiation In Axillary Buds Expected To Develop Into mentioning

confidence: 99%

Relation Between Floral Initiations on Apical Buds of Basal Shoots After the Autumn and Cultivar Differences in Unseasonal Flowering of Hydrangea

2020

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“…2). The number of nodes with fully expanded leaves was Kosugi and Arai (1960). 0: Vegetative; 1: initial primordium developed; 2: secondary inflorescence branched; 3: tertiary inflorescence branched; 4: quaternary inflorescence branched; 5: highly branched inflorescence.…”

Section: Pinch Treatment and Evaluation Of Flower Bud Productionmentioning

confidence: 99%

“…This treatment removed any floral buds that had been produced up to the previous autumn. From May 24 to 26, 2011, 10 apical buds of the developed axillary shoots were dissected under a stereomicroscope (SZ60; Olympus Co., Ltd., Japan), and the developmental stage of each apical bud was determined according to Kosugi and Arai (1960; Fig. 2).…”

Section: Pinch Treatment and Evaluation Of Flower Bud Productionmentioning

confidence: 99%

“…Sections were extended and deparaffinized according to standard procedures and stained with 1:1000 diluted safranin O (Muto Pure Chemicals Co., Ltd., Japan). The cross sections were then observed under an optical microscope (BH2; Olympus Co., Ltd.), and the developmental stage of each apical meristem was determined according to Kosugi and Arai (1960; Fig. 2).…”

Section: Flower Bud Initiation In the Axillary Shootsmentioning

confidence: 99%

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Selection of Hydrangea (<i>Hydrangea</i> spp.) Cultivars with High Potential for Unseasonable Flower Bud Production in Japan

et al. 2018

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Hydrangea (Hydrangea spp.) flower buds usually differentiate from the end of summer through autumn, but some cultivars can also produce flower buds in spring. In the present study, we selected cultivars with high potential for such unseasonable flower bud production in Japan by evaluating the flower bud production on pinch-treatment-induced axillary shoots. We also examined the pinching time and the difference between the two shoot types: previously formed shoots that developed from buds formed in the previous autumn and basal shoots that formed in the current spring. We found that 'Christmas', 'Endless Summer', and 'Rosea' had the highest frequencies of unseasonable flower bud production on the axillary shoots of previously formed shoots (90.0%, 80.0%, and 90.0%, respectively) and basal shoots (90.0% for all three cultivars). When the buds were pinched in mid-April, the axillary shoots that formed on both shoot types flowered from early July to midAugust, which was approximately 1 month later than for seasonably produced flower buds in the same cultivars. In 2011, 98.0%, 90.5%, and 84.0% of the axillary shoots that developed on previously formed shoots flowered in 'Christmas', 'Endless Summer', and 'Rosea', respectively, while in 2012, 63.2%, 54.9%, and 75.3% flowered, respectively. Similar values were seen for the basal shoots, with the exception of 'Christmas' in 2011 and 'Endless Summer' in 2012, which both had lower flowering rates than previously formed shoots. In 'Rosea', flower bud differentiation started just after the pinch treatment, and the frequency of flower bud production decreased when the pinch treatment was conducted after late April. Thus, 'Christmas', 'Endless Summer', and 'Rosea' were considered to have high potential for unseasonable flowering following pinch treatment in early spring. However, unseasonable flower bud production may often be suppressed in pinched basal shoots.

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Isolation and expression pattern of genes related to flower initiation in the evergreen azalea, Rhododendron×pulchrum ‘Oomurasaki’

Cheon

Nakatsuka

Kobayashi

2011

Scientia Horticulturae

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Studies on the flower bud differentiation and development in some ornamental trees and shrubs. V

Cited by 5 publications

References 0 publications

Relation Between Floral Initiations on Apical Buds of Basal Shoots After the Autumn and Cultivar Differences in Unseasonal Flowering of Hydrangea

Relation Between Floral Initiations on Apical Buds of Basal Shoots After the Autumn and Cultivar Differences in Unseasonal Flowering of Hydrangea

Selection of Hydrangea (<i>Hydrangea</i> spp.) Cultivars with High Potential for Unseasonable Flower Bud Production in Japan

Isolation and expression pattern of genes related to flower initiation in the evergreen azalea, Rhododendron×pulchrum ‘Oomurasaki’

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