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Gibberellin mediates the development of gelatinous fibres in the tension wood of inclined Acacia mangium seedlings

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† Background and Aims:
Gibberellin stimulates negative gravitropism and the formation of tension wood in tilted Acacia mangium seedlings, while inhibitors of gibberellin synthesis strongly inhibit the return to vertical growth and suppress the formation of tension wood. To characterize the role of gibberellin in tension wood formation and
gravitropism, this study investigated the role of gibberellin in the development of gelatinous fibres and in the changes in anatomical characteristics of woody elements in Acacia mangium seedlings exposed to a gravitational stimulus.

† Methods:
Gibberellin, paclobutrazol and uniconazole-P were applied to the soil in which seedlings were growing, using distilledwater as the control. Three days after the start of treatment, seedlingswere inclined at 45 8 to the vertical and samples were harvested 2 months later. The effects of the treatments on wood fibres, vessel elements and ray parenchymacells were analysed in tension wood in the upper part of inclined stems and in the opposite wood on the lower side of inclined stems.

† Key Results:
Application of paclobutrazol or uniconazole-P inhibited the increase in the thickness of gelatinous layers and prevented the elongation of gelatinous fibres in the tension wood of inclined stems. Bycontrast, gibberellin stimulated the elongation of these fibres. Application of gibberellin and inhibitors of gibberellin biosynthesis had only minor effects on the anatomical characteristics of vessel and ray parenchyma cells.

†Conclusions:
The results suggest that gibberellin is important for the development of gelatinous fibres in the tension
wood of A. mangium seedlings and therefore in gravitropism.

Key words: Acacia mangium, gelatinous fibres, gibberellin, gravitropism, paclobutrazol, tension wood,
uniconazole-P.

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Informasi Detail

Judul Seri

Annals of Botany

No. Panggil

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Penerbit

Oxford : Oxford University Press on behalf of the Annals of Botany Company., 2013

Deskripsi Fisik

Annals of Botany 112: 1321–1329, 2013

Bahasa

English

ISBN/ISSN

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Klasifikasi

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Tipe Isi

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Tipe Media

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Tipe Pembawa

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Edisi

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Subjek

EKOFISIOLOGI TANAMAN

Info Detail Spesifik

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Pernyataan Tanggungjawab

agus

Versi lain/terkait

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