Non-ionic surfactants improved microspore embryogenesis and plant regeneration of recalcitrant purple flowering stalk (Brassica campestris ssp. chinensis var. purpurea Bailey). - Gao, Yiming; Jia, Junxiang; Cong, Jialin; Ma, Yuying; Feng, Hui; Zhang, Yun (In Vitro Cellular & Developmental Biology Plant, 2020)