Add time:09/04/2019         Source:sciencedirect.com

Endogenous IAA and 4-chloroindole-3-acetic acid (4-C1-IAA) were analysed in vegetative and reproductive tissues of the garden pea (Pisum sativum) using GC-MS selected ion monitoring in the presence of stable-isotope labelled internal standards. In fruit collected 3–8 days after anthesis (DAA) conjugates of both auxins were more abundant than the free hormones. Auxin levels (ng g−1 fr. wt) in the seeds were higher by 1–2 orders of magnitude than in the pericarps. However, as seeds are small at this stage, the pericarp nevertheless contains a substantial fraction of the overall quantity of IAA and 4-C1-IAA. While, in young fruit tissues, IAA was more abundant than 4-C1-IAA, the opposite was true for seeds at the ‘table-ready’ stage and for roots of nine-day-old seedlings. Our data suggest that both IAA and 4-C1-IAA are required to coordinate the vegetative and reproductive growth of pea plants. © 1997 Elsevier Science Ltd

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