N VITRO CULTURE RESPONSE OF APICAL AND AXILLARY SHOOT-TIPS EXCISED FROM CRISPHEAD LETTUCE CORES DEPENDS ON HEAD MATURITY, NOT SHTORAGE TIME

摘要

Successful lettuce (Lactuca sativa L.) breeding requires assessment, selection, and rescue of germplasm from field-grown plants during a limited period of time. Tissue culture methods have proved successful in rescuing selected lettue genotypes and producing seeds in a disease-free environment. The present study was conducted to determine the response of the apical and axillary shoot-tips of lettuce to storage duration prior to in vitro culture. The study focused on core length#