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Standardization of in vitro hardening strategies for tissue cultured wine grape (Vitis vinifera L) genotypes

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A study was carried out to establish efficient hardening strategy for in vitro raised plantlets of four grape genotypes. In vitro grown plantlets of Pusa Navrang, Hybrid 76-1 (Hur x Cardinal), Pearl of Csaba and Julesky Muscat were hardened in vitro using hardening medium consisting coco peat + vermiculite + perlite (2:1:1) ratio and two different types of hardening pots viz. glass jars with polypropylene cap (GJPP) and plastic pots with polyethylene cover (PPPC). The glass jar containing coco peat + vermiculite + perlite (2:1:1) was found the most effective strategy for hardening in vitro raised plantlets which gave the highest survival (85.97%) and earliest duration for acclimatization of plantlets (23.56 days). Plastic pot with the coco peat + vermiculite + perlite (2:1:1) (T2) was found non-significant since it required a longer duration for acclimatization (27.93) and also giving lower survival rate (63.46%). | Standardization of in vitro hardening strategies for tissue cultured wine grape (Vitis vinifera L) genotypes