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Development of Cytoplasmic Male Sterile Line A2Sx3197 with Resistance to Head Smut （Sphacetheca reliana clint） and Pollen Abortion in Sorghum vulara Cytological Observation of Anther Development of Photoperiod/Thermo- sensitive Male Sterile Line Huiyou50S in Brassica napus Characteristics and abortion cytological pathways of male sterility of Bupleurum chinense Effect of Triticum spelta 1BS Chromosome on Pollen Development of K-Type Male Sterile Lines of Wheat