Production of Eucalyptus cloeziana cuttings in response to stock plant temperature

Stephen Trueman, Tracey McMahon, Mila Bristow

    Research output: Contribution to journalArticle

    Abstract

    Propagation of tropical and subtropical eucalypts is often limited by reduced production of rooted cuttings in winter. We assessed whether changing the temperature of stock plants of Eucalyptus cloeziana from 28/23 (day/night) to 18/13, 23/18 or 33/28 °C affected the production, nutrient concentrations and percentages of cuttings that subsequently formed roots. Lowering the temperature to 18/13 or 23/18 °C greatly reduced the number of cuttings harvested from stock plants but did not affect the percentage of cuttings that formed roots. However, raising the temperature to 33/28 °C greatly increased the number of cuttings produced by stock plants and the ensuing percentage of cuttings that formed adventitious roots, thereby increasing the final number of rooted cuttings produced from each stock plant. The effects of stock plant temperatures on rooting were not the result of altered nutrient concentrations. However, consistent relationships were found between adventitious root formation and boron concentration. Rooting percentages were very low (1-14%) but rooted cutting production per stock plant (e.g. 12 rooted cuttings over a 14-week period at 33/28 °C) was sufficient to establish field tests for clonal plantation forestry. Pembiakan Eucalyptus di kawasan tropika dan subtropika lazimnya dihadkan oleh kekurangan penghasilan keratan berakar pada musim sejuk. Kami mengkaji sama ada perubahan suhustoktanaman Eucalyptus doezianadaripada 28 °C/23 °C (siang/malam) kepada 18 °C/13 °C, 23°C/18 °C atau 33 °C/28 °C boleh mempengaruhi penghasilan keratan, kepekatan nutrien dan peratusan keratan yang kemudiannya membentuk akar. Penurunan suhu kepada 18 °C/13 °C atau 23 °C/18 °C mengurangkan dengan banyaknya bilangan keratan daripada stok tanaman tetapi ia tidak mempengaruhi peratusan keratan yang membentuk akar. Bagaimanapun, peningkatan suhu kepada 33 °C/28 °C menambah dengan banyaknya bilangan keratan yang dihasilkan daripada stok tanaman dan peratusan keratan yang kemudiannya membentuk akar advenutius. Seterusnya, ini meningkatkan jumlah akhir keratan berakar yang dihasilkan daripada setiap stok tanaman. Namun, hubungan yang konsisten diperhatikan antara pembentukan akar adventitius dengan kepekatan boron. Peratusan pengakaran adalah sangat rendah (1%—14%) tetapi penghasilan keratan berakar setiap stok tanaman (iaitu 12 keratan akar selama tempoh 14 minggu pada 33 °C/28 °C) adalah mencukupi untuk mengasaskan ujian lapangan bagi perhutanan tani klon.
    Original languageEnglish
    Pages (from-to)60-69
    Number of pages10
    JournalJournal of Tropical Forest Science
    Volume25
    Issue number1
    Publication statusPublished - 2013

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