QTL location of anthocyanin content and yield in tetraploid pigmented potato Cytological Observation of Microsporogenesis of Hybrid F1 Derived from Male Sterile Line and Transgenic Strong Restorer in Upland Cotton Agronomic Traitsand Cytogenetics of Hybrid F1 Generated from Male Sterile Line of Sorghum and Four Kinds of Sorghum sudanense