Abstract
In order to reduce the occurrence of hyperhydrated shoots, the response of three sunflower inbred lines was examined on regeneration media containing various concentrations of kinetin, silver nitrate, and casein hydrolysate, calcium nitrate and cobalt nitrate. There were differences among the inbred lines for all the parameters taken into account to outline the in vitro efficiency. Percentage of hyperhydrated primordia, average number of shoots and of primordia per total explants, and percentage of hyperhydrated shoot traits differed among all media. The genotype × culture media interaction was significant for average number of shoots and primordia per total explants, regeneration percentage and percentage of hyperhydrated primordia. Among all media tested, those containing silver nitrate significantly reduced hyperhydricity in a dose-dependent way. The addition of silver nitrate showed to be useful in improving the quality of sunflower micropropagated plants by reducing this undesirable phenomenon.
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