Monogenic inheritance has been established for the following characters of the jute plant:

Bitter-non-bitter taste (Tb-tb) inC. capsularis.

Yellow-light yellow anther colour (Ay-ay) inC. capsularis.

Yellow-light yellow corolla-anther colour (Py_o-py_o) inC. olitorius.

The following linkage relationships have been established:

Bitter taste and branching habit factor pairs are linked with 22·2% crossing-over value.

The corolla and anther colour factor pairs inC. capsularis are completely linked, while inC. olitorius corolla colour and anther colour expression is probably controlled by the same factor pair.

The genes ofC. capsularis described here have been shown to be located in five groups.

The corolla-anther factor pair inC. olitorius has been shown to be independent of the anthocyanin multiple allelomorphs.

Three leaf blade pigment patternsviz., purple (Strain CP.12), purple wash (Strain CH.17) and faint purple wash (Strain CH.17mutant) have been described.

The mode of inheritance of anthocyanin pigmentation in the leaf blade has been studied by making inter-crosses between the three pigmented types and between these pigmented and several green leaf blade types. A six factor hypothesis showing the role of each gene and its relationship with others is presented to explain this inheritance.

TheF₂ segregation of 13:3, 55:9 and 229:27 of green: purple leaf, obtained in crosses between CP.12 × HS.22, CP.12 × T.1029/2 or CP.12 × T.786 and CP.12 × T.136 respectively is due to two, three and four gene differences respectively between the parents crossed; one of these genes is an inhibitory factor which suppresses the expression of purple pigment.

The 9:7 and 27:37 ratios of purple wash: green in crosses between CH.17 and green leaf blade varieties are due to the interaction of two and three complementary genes respectively.

TheF₂ segregation of 39 purple wash:12 purple:13 green obtained from the cross CP.12 × CH.17 (purple × purple wash) is shown to be due to interaction of complementary factors and presence of an inhibitory geneIlp, the latter being epistatic over geneLp for purple colour. The four factor segregation of 117PW: 36P: 48FPW: 55G in the cross CP.12 × CH.17mutant, is shown to be due to interaction of four complementary genes one of which is a lower alleleLd′ and the other an inhibitory factorIlp.

The monogenic segregation obtained from the cross CH.17 × CH.17mutant is shown to be due to a single factor differenceLd-Ld′.

The occurrence of purple wash leaf blade phenotype along with the faint purple wash and green leaf blade phenotypes in theF₂ of the cross AC.16 × CH.17mutant (G × FPW) has been explained as being due to the presence of the higher alleleLd in AC.16 as against the lower alleleLd′ present in CH.17mutant.

Some of the anomalous ratios like 3 green: 1 purple, 10 green: 1 purple and 8.3 green: 1 purple reported by previous workers have been explained on the basis of the six factor hypothesis.