Abstract

LASKOWSKI, Libia E; MONERRI, Consuelo; GARCIA-LUIS, Amparo  and  GUARDIOLA, José Luis. Effect of applications of IAA and auxin inhibitors on initial fruit development of Citrus sinensis (L.) Osbeck cv. Salustiana. Bioagro [online]. 2008, vol.20, n.3, pp.167-176. ISSN 1316-3361.

The effect of application of IAA, antiauxin (PCIB), and auxin transport inhibitors (HFCA, TIBA and NPA) on vascular development of pedicel and fruit growth was studied in Citrus sinensis (L.) Osbeck cv. Salustiana. Substances were applied on pedicels of fruits having 19 and 30 mm in diameter (55 and 65 days after anthesis). NPA depressed fruit growth although no effect was detected on pedicel development. No effect was observed on pedicel or fruit growth after TIBA and PCIB applications. The inhibitor HFCA altered the vessel differentiation pattern and fruits were significantly smaller, being higher the effect on the smaller fruits. IAA applications caused inhibition of pedicel vascular tissue development, and induced formation of smaller fruits. These results confirmed the relationship among auxins, pedicel vascular tissue development, and fruit growth.

Keywords : Fruit development; pedicel vascular development; auxin inhibitors.