1. Abeles FB, Morgan PW, Saltveit ME (1992) Ethylene in plant biology. Academic Press, San Diego
2. Aboshama HMS (2011) Direct somatic embryogenesis of pepper (Capsicum annuum L.). World Agric Sci 7(6):755–762
3. Agrawal S, Chandra N (1983) Differentiation of multiple shoot buds and plantlets in cultured embryos of Capsicum annuum L. var. Mathania. Curr Sci 52:645–646
4. Ahmadi B, Shariatpanahi ME, Ojaghkandi MA, Heydari AA (2014) Improved microspore embryogenesis induction and plantlet regeneration using putrescine, cefotaxime and vancomycin in Brassica napus L. Plant Cell Tissue Organ Cult 118:497–505
5. Altman A (1989) Polyamines and plant hormones. In: Bacharach U, Heimer YM (eds) The physiology of polyamines, vol 2. CRC Press, Boca Ratón, pp 121–145