Comparative study of root systems in citrus macrophylla seedlings and microcuttings propagated in vitro

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Abstract

Citrus macrophylla is very important as rootstocks for lemons. The in vitro propagation reduces the propagation time, and uses less quantities of seed. Seedlings root system was compared to in vitro rooted microcuttings. MS salt mixtures was used, with 1,5 mg l-1 IBA, 0,25 g l-1 activated charcoal, 7,5 g l-1 agar and 25 g 1-1 sucrose. After in vitro phase, the plantlets were put in minirhizotron (Riedaker, 1974), under a greenhouse with natural photoperiod. This is a non-destructive system to do direct observations of the roots, in a mixture of peat moss and vermiculite (2:1 v/v). Growth rate was evaluated for 8 weeks. Root system architecture of the seedlings was a typical "pivotant" type. Microcuttings presented a multiplex adventitious pattern (3-4 roots), with one of them taking a major role, assessing a natural seedlings-pattern; in addition, this main root had a gravitropic growth rate, while one of them other presented a plagiotropism and lower growth rate. Main root microcutting, without difference in the others, that presented a fibrous type. In conclusion, the in vitro formed adventitious roots are most efficient that the controls.

Original languageEnglish
Title of host publicationIII International Symposium on In Vitro Culture and Horticultural Breeding
PublisherInternational Society for Horticultural Science
Pages591-596
Number of pages6
ISBN (Print)9789066059092
DOIs
StatePublished - 1997
Externally publishedYes

Publication series

NameActa Horticulturae
Volume447
ISSN (Print)0567-7572

Keywords

  • Citrus macrophylla
  • In vitro
  • Microcutting and adventitious root
  • Seedlings

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