Scanning Electron Microscopic Observation on Morphogenesis in the Ovule Culture of Citrus An Ultrastructural Study on the In Vitro Parthenogenesis in Sunflower STUDIES IN GETTING HYBRIDS PLANTS OF INTERSPECIFIC\=HYBRIDIZATION THROUGH OVULE CULTURE IN VITRO Microscopical Observations on the Embryoid Formation in Cultured Unfertilized Ovules of Helianthus annuus L. Production and Identification of Interspecific Hybrids between Chinese Cabbage and Purple Cabbage REGENERATION OF PLANTLETS IN VITRO CULTURED UNFERTILIZED OVULES OF SUNFLOWER (HELIANTHUS ANNUUS. L. ) EXPERIMENTAL STUDIES ON SEVERAL FACTORS AFFECTING UNFERTILIZED OVULE CULTURE IN SUNFLOWER Inducement of Fiber Cell Elongation from Ovule of Lintless Mutant (Ligon Cotton, Gossypium hirsutum L.) in vitro with IAA and GA3 Histochemical Studies on in Vitro Parthenogenesis in Helianthus annuus L. Regulation of In Vitro Parthenogenesis and Somatic Proliferation in Sunflower by Several Factors Primary Report of Studies on Overcoming the Interspecific Incompatibility and Hybrid Abortion between Series A and B in the Section Batatas of Genus Ipomoea Production of Virus-tree Nucellar Plantlets from Unfertilized Ovules of Citrus in vitro A High-frequency in vivo-in vitro Experimental System for Embryogenesis Study