Abstract
Summer-to-autumn-flowering small-flowered spray-type (SAFS) chrysanthemums (Chrysanthemum morifolium Ramat.) are commercially important in Japan, and there is an occasional increased demand for these flowers. However, under current cultivation methods, the quality of spray formations is compromised in order to maintain a sufficient production rate at times of peak demand. This study investigated the effect of interrupted lighting (IL), the intercalation of a period of long days (by night interruption) into the natural day length (NDL) period of growing, in order to regulate spray formations in SAFS chrysanthemum cultivars 'Haruka' and 'Subaru', in which lighting can markedly delay flowering. The effects of the NDL period before IL and those of the IL period were investigated. First, we investigated the effect of 2–12 days of NDL followed by 12 days of IL. Plants subjected to 2–6 days of NDL had longer flower clusters and a greater number of flower buds on the upper lateral flower stems and developed a broom-like spray. Next, we investigated the effect of 4– 20 days of IL after 4 days of NDL. Plants subjected to 8–20 days of IL had longer flower clusters, more flower buds on the upper lateral flower stems, and broom-like sprays. These changes were more pronounced when the IL periods were prolonged. Our results showed that spray formation in SAFS chrysanthemum cultivars 'Haruka' and 'Subaru' can be regulated by controlling the timing and period of IL.
| Original language | English |
|---|---|
| Pages (from-to) | 264-271 |
| Number of pages | 8 |
| Journal | Horticulture Journal |
| Volume | 85 |
| Issue number | 3 |
| DOIs | |
| Publication status | Published - Dec 16 2016 |
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Keywords
- Flower cluster length
- Light culture
- Long day
- Number of flower buds
- Short day
ASJC Scopus subject areas
- Horticulture
- Plant Science
Cite this
Effects of interrupted lighting on the spray formation of summer-toautumn-flowering small-flowered spray-type chrysanthemum cultivars 'Haruka' and 'Subaru'. / Mori, Yoshio; Sumitomo, Katsuhiko; Hisamatsu, Tamotsu; Goto, Tanjuro.
In: Horticulture Journal, Vol. 85, No. 3, 16.12.2016, p. 264-271.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Effects of interrupted lighting on the spray formation of summer-toautumn-flowering small-flowered spray-type chrysanthemum cultivars 'Haruka' and 'Subaru'
AU - Mori, Yoshio
AU - Sumitomo, Katsuhiko
AU - Hisamatsu, Tamotsu
AU - Goto, Tanjuro
PY - 2016/12/16
Y1 - 2016/12/16
N2 - Summer-to-autumn-flowering small-flowered spray-type (SAFS) chrysanthemums (Chrysanthemum morifolium Ramat.) are commercially important in Japan, and there is an occasional increased demand for these flowers. However, under current cultivation methods, the quality of spray formations is compromised in order to maintain a sufficient production rate at times of peak demand. This study investigated the effect of interrupted lighting (IL), the intercalation of a period of long days (by night interruption) into the natural day length (NDL) period of growing, in order to regulate spray formations in SAFS chrysanthemum cultivars 'Haruka' and 'Subaru', in which lighting can markedly delay flowering. The effects of the NDL period before IL and those of the IL period were investigated. First, we investigated the effect of 2–12 days of NDL followed by 12 days of IL. Plants subjected to 2–6 days of NDL had longer flower clusters and a greater number of flower buds on the upper lateral flower stems and developed a broom-like spray. Next, we investigated the effect of 4– 20 days of IL after 4 days of NDL. Plants subjected to 8–20 days of IL had longer flower clusters, more flower buds on the upper lateral flower stems, and broom-like sprays. These changes were more pronounced when the IL periods were prolonged. Our results showed that spray formation in SAFS chrysanthemum cultivars 'Haruka' and 'Subaru' can be regulated by controlling the timing and period of IL.
AB - Summer-to-autumn-flowering small-flowered spray-type (SAFS) chrysanthemums (Chrysanthemum morifolium Ramat.) are commercially important in Japan, and there is an occasional increased demand for these flowers. However, under current cultivation methods, the quality of spray formations is compromised in order to maintain a sufficient production rate at times of peak demand. This study investigated the effect of interrupted lighting (IL), the intercalation of a period of long days (by night interruption) into the natural day length (NDL) period of growing, in order to regulate spray formations in SAFS chrysanthemum cultivars 'Haruka' and 'Subaru', in which lighting can markedly delay flowering. The effects of the NDL period before IL and those of the IL period were investigated. First, we investigated the effect of 2–12 days of NDL followed by 12 days of IL. Plants subjected to 2–6 days of NDL had longer flower clusters and a greater number of flower buds on the upper lateral flower stems and developed a broom-like spray. Next, we investigated the effect of 4– 20 days of IL after 4 days of NDL. Plants subjected to 8–20 days of IL had longer flower clusters, more flower buds on the upper lateral flower stems, and broom-like sprays. These changes were more pronounced when the IL periods were prolonged. Our results showed that spray formation in SAFS chrysanthemum cultivars 'Haruka' and 'Subaru' can be regulated by controlling the timing and period of IL.
KW - Flower cluster length
KW - Light culture
KW - Long day
KW - Number of flower buds
KW - Short day
UR - http://www.scopus.com/inward/record.url?scp=84980007072&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84980007072&partnerID=8YFLogxK
U2 - 10.2503/hortj.MI-072
DO - 10.2503/hortj.MI-072
M3 - Article
AN - SCOPUS:84980007072
VL - 85
SP - 264
EP - 271
JO - Horticulture Journal
JF - Horticulture Journal
SN - 2189-0102
IS - 3
ER -