Hi Arshad,

Attached is an article regarding the F1 hybrid seed production of tomatoes from AVRDC ( AVRDC.org ). Good luck on your research.

Regarding your second question:

In the sense of F1 hybrid seed production to answer your question:

1. P1 x P2 = F1 seeds

2. Inbred P1 x Inbred P2 = F1 hybrid seeds (where both Parents are with high level of homozygosity)

Hi,

F1 can occur naturally if conditions are right (a natural cross, for instance, between two wild varieties). However, the F1 hybrid seeds (from pure lines pair-wise crosses) are different from wild crossed seeds in that their resultant plants have reproducible and predictable characteristics that can be duplicated over and over. Not so for most wild crosses.

You can find some useful information about Chemical Hybridization Agents (CHA) suitable for commercialhybrid seed production in specific vegetable crops from https://ru.scribd.com/doc/62470606/Chemical-Hybridizing-Agents-Report1 

P1 x P2= F1

Parents P1 & P2 must be homozygous and genetically dissimilar