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Humid incubation period and plantlet age influence acclimatization and establishment of micropropagated grapes

  • Micropropagation
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Summary

In vitro rooted grape (Vitis vinifera L.) plantlets (4 or 8 wk from culturing microcuttings) were plantedex vitro in polythene sachets (24×12 cm) filled to one-third their height with planting mixture. The sachets were misted, closed, and incubated at ambient temperature (25–30°C) under 16 h photoperiod (40–50 μ E·m−2.·sec−1) for 1,2, or 3 wk before opening. Maximum establishment with no or minimum damage toin vitro formed leaves was obtained with 3 wk of closed sachet incubation in both age groups. Opening the sachet at 2 wk from planting resulted in marginal scorching of lower leaves and some reduction in establishment and vigor. Opening at 1 wk led to severe leaf scorching and significant reduction in establisment particularly in 4-wk-oldin vitro plantlets while growth was more affected in 8-wk-old ones. Relative humidity ofin vitro culture vessel was 68–75% while closed sachets had RH values of 45–77% depending on length of incubation and ambient RH. Diurnal variation in RH of sachet in relation to ambient RH was the major factor that facilitated acclimatization rather than the overall fall in RH during the period of closed incubation. Satisfactory acclimatization of plantlets to withstand the open sachet RH (50–55%) by 3 wk and the ambient RH (30–40%) by 4 wk was achieved. Monitoring water loss from detached leaves of plantlets showed a significant reduction between the date of planting and Week 3, and again between Weeks 3 and 4. Comparison of growthin vitro andex vitro suggested that shifting toex vitro earlier was more beneficial. This observation was confirmed by transferring 3-, 4-, and 5-wk-old plantlets fromin vitro rooting medium toex vitro and recording the growth at 8 wk fromin vitro culturing when 3 wkin vitro plus 5 wkex vitro combination showed maximum vigor. The leftover stumps after subculturing of 1–4-mo.-old stock cultures could also be effectively used forex vitro establishment.

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  1. Division of Biotechnology, Indian Institute of Horticultural Research, Hessaraghatta Lake, 560 089, Bangalore, India

    Pious Thomas

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Thomas, P. Humid incubation period and plantlet age influence acclimatization and establishment of micropropagated grapes. In Vitro Cell.Dev.Biol.-Plant 34, 52–56 (1998). https://doi.org/10.1007/BF02823123

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  • DOI: https://doi.org/10.1007/BF02823123

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