Cold treatments enhance responsiveness to gibberellin in stock (Matthiola incana (L.) R. Br.) |
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Authors: | T Hisamatsu |
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Institution: | National Research Institute of Vegetables, Ornamental Plants and Tea, 360 Kusawa, Ano, Age, Mie, 514-2392 Japan |
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Abstract: | SummaryEndogenous GAs have been suggested as regulators of stem elongation and flowering of cold-requiring plants. Here, the relationship between temperature conditions and responsiveness to GA4 on stem elongation and flowering of stock (Matthiola incana) was investigated. The optimum temperature for induction of flower bud initiation was 10°C, and the minimum duration was 20 d in the late flowering cv. Banrei; the type of cold treatment effect on flowering was classified as a “direct effect”. Stem elongation was markedly promoted by cold treatment regardless of flower bud initiation. The cold treatment amplified the stem elongation response to GA4. The GA4 level necessary for flower bud initiation was lower in the 10°C treatment than in the 15°C treatment, and it became lower at longer durations of cold treatment. These results indicate that the cold treatments enhance responsiveness to GA4 not only in the stem elongation process but also in the flower bud initiation process and that the development of responsiveness to GA4 may correlate with the temperature and duration of cold treatment. |
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