In vitro hardening of red raspberry through CO2 enrichment and relative humidity reduction on sugar-free medium

carbon dioxide crecimiento croissance cultivo in vitro culture in vitro culture media dioxyde de carbone durcissement endurecimiento enracinement enraizamiento estoma growth hardening humedad relativa in vitro culture medio de cultivo micropropagation milieu de culture photosynthese photosynthesis relative humidity rooting rubus idaeus saccharose shoots stems stomata stomate sucrosa sucrose tallo tige