Physiological and pollen-based screening of shrub roses for hot and drought environments

Rose plants growing under natural conditions are exposed to unfavorable environmental such as high temperature and drought, particularly around the blooming stage. This can reduce reproductive potential aesthetic value of commercial rose cultivars, which often more sensitive harsh conditions. Plants adjust adverse environments by regulating several morpho-physiological biochemical processes, key tolerance mechanisms. Thus, examine genetic 22 roses, we characterized 18 traits: gas exchange, leaf biophysical, pigments, pollen germination characteristics using field-grown roses at A broad variability (P < 0.001) in all measured traits suggests that comprise heat- drought-adaptive traits. weak correlation between viability or tube length 38 °C signifying complexity processes. However, three Moje Hammarberg, Carefree Spirit, Lavender Meidiland had better germination-related (25 %) along with photosynthetic capacity (24 pigment (22 compared cultivars. The generated phenotypic data, reliable phenotyping methods identified candidate would help develop enhanced resilience stress for dry hotter climates.