Table 4. Conventional crossing between N. occidentalis and two progenitors of N. tabacum.

Cross combination	No. of flowers pollinated	No. of capsules obtained	No. of seeds sown	No. of hybrids obtained
N. occidentalis ♀×N. sylvestris ♂	20	19	160	119
N. sylvestris ♀×N. occidentalis ♂	20	0	–	–
N. occidentalis ♀×N. tomentosiformis ♂	17	10	157	140
N. tomentosiformis ♀×N. occidentalis ♂	20	0	–	–
N. sylvestris	–	–	120	117
N. tomentosiformis	–	–	120	114