Effect of Photoperiod after Bolting on the Expression of Gynomonoecy in Spinacia oleracea L.
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Accession number;06A0224889
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| Title;Effect of Photoperiod after Bolting on the Expression of Gynomonoecy in Spinacia oleracea L. |
| Author;
HATA NAOKI
(Okayama Univ., Okayama, Jpn)
MURAKAMI KENJI
(Okayama Univ., Okayama, Jpn)
YOSHIDA YUICHI
(Okayama Univ., Okayama, Jpn)
MASUDA MASAHARU
(Okayama Univ., Okayama, Jpn)
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Journal Title;Journal of the Japanese Society for Horticultural Science
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Journal Code:F0626A
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ISSN:0013-7626
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VOL.75;NO.2;PAGE.141-147(2006)
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| Figure&Table&Reference;FIG.2, TBL.3, REF.14 |
| Pub. Country;Japan |
| Language;English |
| Abstract;To shorten the breeding cycle in spinach, the effect of photoperiod after bolting on the expression of gynomonoecy was investigated by employing selfed-progeny of a gynomonoecious spinach plant. Seedlings were induced to bolt by an initial exposure to 16-h photoperiod under 140 .MU.mol m'-2' s'-1' PPFD and 20.DEG.C. in a growth chamber for 3 weeks after sowing. When transferred to an 8-h photoperiod of the same PPFD, flower stalk elongation and flowering were severely inhibited; the frequency of gynomonoecious plants decreased to about a half of those under 12- and 16-h photoperiods. Under the short-day treatment, a few nodes with hermaphroditic flowers developed; the frequency of hermaphroditic flowers on gynomonoecious plants was 30, 39, and 63% under 8-, 12-, and 16-h photoperiod, respectively. Even when the light intensity under the 8-h photoperiod was doubled, the flower stalks elongated little, while 46% of the plants did not flower. When 8-h photoperiod under 280 .MU.mol m'-2' s'-1' PPFD was extended to 16-h, by using an incandescent lamp with an intensity of 10 .MU.mol m'-2' s'-1'PPFD, the seedlings produced flower stalks that were longer than those grown under 16-h photoperiod and 140 .MU.mol m'-2' s'-1' PPFD, and all plants flowered. There was no difference in the frequency of gynomonoecious plants and hermaphroditic flowers in both 16-h photoperiodic regimes. Extending the photoperiod to 24-h (constant light) from 8-h photoperiod at 280 .MU.mol m'-2' s'-1' with incandescent lights promoted flower stalk elongation more than did that by extending it to 16-h. However, the frequency of hermaphroditic flowers was almost the same in both the 16- and 24-h photoperiodic regimes. Thus, the expression of gynomonoecy after bolting in spinach was inhibited strongly under a short photoperiod and was promoted significantly by extending the photoperiod to 16-h, but extending the photoperiod to 24-h had no further effect.... (author abst.) |
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