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Standardization of in vitro pollen germination medium for Luffa species. Data presented in vertical bars represent mean ± SE. Significant differences (P ≤ 0.05) in pollen germination are presented by different alphabets analyzed by Duncan’s Multiple Range Test. The optimum in vitro pollen germination medium is provided in the orange and yellow boxes below each species. Representative images for pollen germination at different sucrose concentrations are provided for L. cylindrica.
