Jain is married to Kusum Lata and the couple has two children, Neera and Reena.
Legacy
Jain's early researches on Lilium, a genus of herbaceous plants, and its meiotic cell division revealed the correlation between the chromosome condensation and nucleolar synthesis.[4] After joining IARI, he and his colleagues worked on the cytological mechanisms of genetic recombination, on Delphinium, a perennial flowering plant genus. His work contributed to the development of a protocol for controlling the interchromosome level, which was experimentally evidenced by subsequent researches by others.[2] Later, he worked on tomato and Drosophila (popularly known as fruit flies) and his studies assisted in the discovery of chemical mutagen specificity. He headed the wheat development programs of IARI and initiated three such programs to develop high-yielding varieties of wheat. Ribosomal synthesis in plant cells was another area of his researches. He is credited with developing the concept of national multilineal complex of varieties and the proposal of the multiple and inter-cropping patterns, later popularized by the Indian Agricultural Research Institute.[11] He authored five books[12] which included Plant Breeding: Mendelian to Molecular Approaches[13]Genetics: Principles, Concepts and Implications,[14] and Green Revolution: History, Impact and Future[15] and several articles which document the body of his work.[16]
H. K. Jain (1999). Genetics: Principles, Concepts and Implications. Science Pub Inc. p. 438. ISBN978-1578080540.
H. K. Jain (1985). Indian Agriculture in 2000 AD. Indian National Science Academy. p. 45. LCCN85904176.
H. K. Jain (1989). Organization and structure in national agricultural research systems. International Service for National Agricultural Research. p. 49. LCCN90129370.
H. K. Jain (2010). Green Revolution: History, Impact and Future. The Green Revolution: History. ISBN978-1-933699-63-9.
H.K. Jain; M.C. Kharkwal (2012). Plant Breeding: Mendelian to Molecular Approaches. Springer Science & Business Media. ISBN978-94-007-1040-5.