Results showed that crossability between the two species was low.
Falusi, OA., Salako, EA., Ishaq, MN. 2001, 'Interspecific Hybridization between Sesamum indicum L. and Ceratotheca sesamoidesEndl', Tropiculturahttp://www.tropicultura.org/text/v19n3/127.pdf. Retrieved from DOAJ CC BY 4.0 (https://creativecommons.org/licenses/by-sa/4.0/legalcode)
Crossability barriers between these two species were overcome by using ovule culture.
Cláudia Silva da Costa Ribeiro, Leonardo de Britto Giordano 2001, 'Método de obtenção de híbridos interespecíficos entre Lycopersicon esculentum e L.peruvianum Interspecific hybrids between Lycopersicon esculentum and L. peruvianum',Pesquisa Agropecuária Brasileirahttp://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2001000500009. Retrieved from DOAJ CC BY 4.0 (https://creativecommons.org/licenses/by-sa/4.0/legalcode)
As a final conclusion, crossing time and proper style length can improve the intraspecific crossability in the species, considerably.
Alireza Valdiani, Mihdzar Abdul Kadir, Mohd Said Saad, Daryush Talei, Vahid Omidvar,Chia Sok Hua 2012, 'Intraspecific Crossability in Andrographis paniculata Nees: A Barrier against Breedingof the Species', The Scientific World Journalhttp://dx.doi.org/10.1100/2012/297545. Retrieved from DOAJ CC BY 4.0 (https://creativecommons.org/licenses/by-sa/4.0/legalcode)