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Fig. 9 | BMC Plant Biology

Fig. 9

From: Regulation of polar auxin transport in grapevine fruitlets (Vitis vinifera L.) and the proposed role of auxin homeostasis during fruit abscission

Fig. 9

Proposed model for auxin homeostasis dynamics and polar auxin transport regulation during grapevine fruitlet abscission. Polar auxin transport and irreversible IAA conjugation to amino acids decline gradually from 7 to 17 DAF, which should result in IAA accumulation, since less IAA is exported out of the fruit or sequestered into conjugates. However, biosynthesis inactivation from 14 DAF onwards and also IAA oxidation might reduce IAA levels. As a result, IAA levels remain within a range capable to maintain GA biosynthesis activated. GA in turn inhibits polar auxin transport. As a consequence, ethylene sensitivity should be enhanced, producing an increase in fruitlet abscission

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BMC Plant Biology

ISSN: 1471-2229

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