Cotton Improvement for Natural
Colour Fibre: Green Lint
Parinya sebunruang
E-mail:
psebunruang@yahoo.com
…………………………………
Cotton improvement for natural-colour
fibre is not only adding value to fibre product but also environmental friendly
in reducing nature pollution from dye process. Thus in 2000, the long staple (fibre or lint) Takfa 2 cotton
was crossed to a green-short staple cotton variety; thereafter (2001-2002),
backcrossing to Takfa 2 and selection for good green-lint yielding cotton
plants for four generations was made. In each backcrossing, seed (after ginning
or separation from seed cotton) was collected in bulk from individual green-
lint cotton plants exhibiting the same plant type as that of
Takfa 2 but having green fibre. The seeds of BC4F1 were then sown
or planted in 2003, plants with green fibre or lint were selected and their
seeds were used for planting as BC4F2 in 2004 for
pedigree method of selection or pure line selection. From all planted BC4F2 plants, 574
plants were individually selected from this generation. Then 574 families of BC4F3
seeds or lines were used for further planting for selection (in the
plant-to-row pattern) in 2005. Two
hundred and eight green-lint yielding rows with the plant type or canopy
similar to Takfa 2 were selected, in which 675 plants were selected for fibre
quality examination. Sixty-six
plants (from 30 rows) had a standard fibre quality with the average of 24%
ginning out turn fibre percentage), 1.24-inch fibre length, 18.3 g tex-1
fibre strength, 47 uniformity and 0.9 micronaire fibre fineness. In 2006, seeds of 66 selected
plants were then planted as 66 rows (plant-to-row) of BC4F4 families
or lines. Only 18 rows or lines with good plant type uniformity were selected,
their mean fibre qualities were 24% ginning out turn, 1.21-inch fibre length,
19 g tex-1 fibre strength, 47 uniformity and 0.6 micronaire fibre
fineness. The bulk-collected seeds
of 18 individual lines were planted as BC4F5 lines in
2007. The lines with uniformity in
good plant type and green fibre quality will be evaluated for yield potential
in 2008.
greenfibre