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Physiological Research on the Relationship between Repeated Cutting and Rooting of Larix

  • Received Date: 2011-09-14
  • The process of adventitious root development of original and partial ortet cuttings of Larix was investigated in the experiment. The effect of repeated cutting on cuttings’ rooting was studied, and the changes of endogenous hormones content in different stages of adventitious root development were analyzed. The results showed that 13-31 days after cottage were the period key to rooting, the formation rate of callus and the growth speed of young roots of partial ortet cuttings were higher than that of the original ones. The effect of repeated cutting on cuttings’ rooting was remarkable, especially the low-rooting percentage ortets, the rooting traits were remarkably improved. The repeated cutting impacted on the self-owned hormone contents, especially IAA, which was obviously higher than that in original ortet cuttings. The hormone ratio of(IAA+GA3+ZR)/ABA of partial ortet cuttings was higher than the original ones during adventitious root development, and the trend was similar to the change trend of rooting ability, which could be used as an index of rooting ability between original and partial ortet cuttings.
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Physiological Research on the Relationship between Repeated Cutting and Rooting of Larix

  • 1. Research Institute of Forestry, Chinese Academy of Forestry, Key Laboratory of Tree Breeding and Cultivation, State Forestry Administration, Beijing 100091, China

Abstract: The process of adventitious root development of original and partial ortet cuttings of Larix was investigated in the experiment. The effect of repeated cutting on cuttings’ rooting was studied, and the changes of endogenous hormones content in different stages of adventitious root development were analyzed. The results showed that 13-31 days after cottage were the period key to rooting, the formation rate of callus and the growth speed of young roots of partial ortet cuttings were higher than that of the original ones. The effect of repeated cutting on cuttings’ rooting was remarkable, especially the low-rooting percentage ortets, the rooting traits were remarkably improved. The repeated cutting impacted on the self-owned hormone contents, especially IAA, which was obviously higher than that in original ortet cuttings. The hormone ratio of(IAA+GA3+ZR)/ABA of partial ortet cuttings was higher than the original ones during adventitious root development, and the trend was similar to the change trend of rooting ability, which could be used as an index of rooting ability between original and partial ortet cuttings.

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