- Fruits harvested on green variety and germinating with green sprouts are true-to-type green variety; those giving brown sprout are natural hybrids between green and red varieties.
- Fruit harvested on the red-orange variety and germinating with red-orange sprouts are true to type red-orange variety.
- All fruits with brown sprouting will be natural hybrids.
Use of genetic markers at nursery stage to select good varieties
Some coconut varieties can usefully be identified at the nursery stage by looking at the color of the sprout of germinating seedlings. This color genetic marker, well known by many farmers for instance in India, is of crucial importance because it allows to differentiate between varieties before planting them.
The most common use by farmers is to recognize, within the progenies of red and yellow dwarfs, the pure red and yellow dwarf seedlings from the few natural Dwarf x Tall hybrids. The main color segregation is genetically based on a simple determinism involving two couples of independent alleles (Bourdeix, 1988).
The varietal mix illustrated in Figure 1 was planted in two isolated small islands of Samoa. For instance, if a green variety is planted together with red or orange varieties, as shown in Figure 1, the color of the sprout will be used as follow:
Posted by Dr Roland Bourdeix