Role of auxins, polyamines and ethylene in root formation and growth in sweet orange

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The primary objective of this work was to investigate the role of polyamines (PAs) on root formation and growth in two sweet orange (Citrus sinensis L. Osb.) cultivars Pineapple and Pêra. Adventitious shoots (30-d-old) derived from epicotyl explants were transferred to root induction medium containing Murashige and Skoog salts at different strengths and supplemented with different concentrations and combinations of auxins. Root formation and development decreased in both sweet orange cultivars concomitant with the reduction of medium strength. The α-naphtaleneacetic acid was important during the root differentiation phase, but its combination with indole-3-butyric acid was essential for root elongation. The addition of PAs significantly improved root formation and/or growth, depending on their concentration, whereas the presence of inhibitor of PAs biosynthesis α-difluoromethylornithine (DFMO) inhibited these processes. The rooting impairment caused by DFMO was partially reversed by the supplementation of putrescine. Aminoethoxyvinylglycine AVG and AgNO3 also inhibited in vitro rooting in both sweet orange cultivars, indicating that ethylene was likewise important for rhizogenesis in sweet orange … celý popis

Podrobná bibliografie

Další autoři

A. F. S. Mendes

Typ dokumentu

Články

Publikováno v

Biologia plantarum. -- ISSN 0006-3134. -- Vol. 55, no. 2 (2011), s. 375-378

Témata

pomerančovník

odrůdy rostlin

fytohormony

polyaminy

ethylen

kořeny rostlin

růst rostlin

rooting

putrescine

spermidine

spermine

auxiny

více… méně…

Popis jednotky

Rubrika: Brief communication