An aquaglyceroporin is abundantly expressed early in the development of the suspensor and the embryo proper of loblolly pine

Ciavatta Vincent T., Morillon Raphaël, Pullman Gerald S., Chrispeels Maarten J., Cairney John. 2001. An aquaglyceroporin is abundantly expressed early in the development of the suspensor and the embryo proper of loblolly pine. Plant Physiology, 127 : 1556-1567.

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Résumé : In contrast to angiosperms, pines and other gymnosperms form well-developed suspensors in somatic embryogenic cultures. This creates a useful system to study suspensor biology. In a study of gene expression during the early stages of conifer embryogenesis, we identified a transcript, PtNIP1;1, that is abundant in immature loblolly pine (Pinus taeda) zygotic and somatic embryos, but is undetectable in later-stage embryos, megagametophytes, and roots, stems, and needles from 1 year-old seedlings. Analysis ofPtNIP1;1 transcript in embryo proper and suspensor tissues by reverse transcription-polymerase chain reaction suggests preferential expression in the suspensor. Based on comparisons of derived amino acid sequences, PtNIP1;1 belongs to the nodulin-like members of the major intrinsic protein superfamily branch of the aquaporin (major intrinsic protein) superfamily. Through heterologous expression in Xenopus laevis oocytes and the yeast (Saccharomyces cerevisiae)fps1 − mutant, PtNIP1;1 has been shown to be an active aquaglyceroporin.

Mots-clés Agrovoc : Pinus taeda, Embryogénèse somatique, expression des gènes, Transcription inverse, Xenopus laevis, Saccharomyces cerevisiae

Mots-clés complémentaires : aquaporine

Classification Agris : F30 - Génétique et amélioration des plantes
F60 - Physiologie et biochimie végétale

Auteurs et affiliations

• Ciavatta Vincent T., Institute of Paper Science and Technology (USA)
• Morillon Raphaël, UC (USA)
• Pullman Gerald S., Institute of Paper Science and Technology (USA)
• Chrispeels Maarten J., UC (USA)
• Cairney John, Institute of Paper Science and Technology (USA) - auteur correspondant

Source : Cirad-Agritrop (https://agritrop.cirad.fr/597495/)

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