Eight cases are reanalysed. In all cases new genetic patterns are found.
2. Analysis of Jones’ data from the cross of Caloro, an entirely green variety, with a wholly purple type, Niro-vialone, indicated that five genes are concerned in the production of purple colour in 12 parts, linked in four groups. The genes are, chromogen gene C; purple anthocynin gene Av, red anthocynin gene Ar and the two extension genes of purple colour, Exp1 and Exp2. The ratio of the four colours is 786 full purple: 81 striped purple: 144 red or pink: 313 green.
3. The reinterpretation of the F2 data, derived from the cross of Kairo bozu (green) and Murasaki-Ine (purple), made by Nagao, revealed that five colour genes and an inhibitor are involved. These are the chromogen gene, an allelic pair of anthocynin genes, AvAr, which is responsible for producing purple and red colour, respectively. Besides, these, there are duplicate sheath blade genes and an inhibitor which prevents spread of colour in the leaf blade in all cases and in the case of one combination of in the sheath also. The differential behaviour of the inhibitor results in modifying the ratios of the two characters, which, without the inhibitor, are the same. With the inhibitor the combined ratio of sheath and blade becomes: 405: 162: 201: 135: 45: 76.
4. Reexamination of Chakravorty's figures from four crosses, between three green varieties and two purple types, shows that purple colour over the whole plant can be caused by complementary action of two, three and even four genes and the spread of purple colour over the leaf blade can be suppressed by an inhibitor.
5. The composition of the sub-classes of green bladed plants disclosed that the colour genes, which act as complementary to produce purple colour all over the plant, individually have different capacities to produce anthocyanin pigment in various parts of the plant and the inhibitor suppresses development of colour of some of them. This is illustrated by examples from Chakravorty, D, Cruz and Kadam's previous reports.
6. The significance of scoring subclasses in the green bladed, coloured plants has been pointed out.
