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Identifying Extra Long Staple Suitable Lines (
Gossypium barbadense
L) Improved Fiber Qualities
5
maximum value of fiber strength (31.67) followed by
the lines DB 533×DB 534 F
5
IPS 57 (30.80) and DB
533×DB 534 F
5
IPS 10 (30.75), while the line DB
533×DB 534 F
5
IPS 52 recorded minimum value of
fiber strength (26.52) followed by DB 533×DB 534 F
5
IPS 2 (27.08). The
per se
performance of 53
barbadense lines showed that 29 lines had higher
values of fiber strength than Suvin line.
1.2 21 Fiber elongation (%)
The lines DB 533×DB 534 F
5
IPS 101 and DB
533×DB 534 F
5
IPS 57 had maximum values of fiber
elongation (6.94) followed by the lines DB 533×DB
534 F
5
IPS 79 (6.91), DB 533×DB 534 F
5
IPS 19
(6.91) and DB 533×DB 534 F
5
IPS 11 (6.91), while
the line DB 533×DB 534 F
5
IPS 2 (6.18) recorded
minimum value of fiber elongation followed by DB
533×DB 534 F
5
IPS 27 (6.24).
1.2 22 S/L ratio (%)
The line DB 533×DB 534 F
5
IPS 4 had maximum
value of S/L ratio (1.01) followed by the lines DB
533×DB 534 F
5
IPS 96 (0.96) and DB 533×DB 534
F
5
IPS 88 (0.96), while the line DB 533×DB 534 F
5
IPS 52 (0.75) recorded minimum value of S/L. Among
all barbadense lines, 27 lines showed higher value
than Suvin barbadense line.
1.3 Intergeneration (F
3
-F
5
) correlation and regression
analysis for fiber quality
The simple correlation was worked out between
parent F
3
and progeny F
5
mean for all the quality
characters by considering same characters in both the
generations and the results are presented in Table 3.
Table 3 Intergeneration correlation coefficient between F
3
and
F
5
generation for fiber quality
Characters
Barbadense lines (F
3
/F
5
)
2.5% SL (mm)
0.48**
UR %
0.37*
Micronaire value (µg/inch)
0.29*
Maturity Ratio (%)
-0.03
Tenacity (g/t)
0.18
Elongation %
-0.18
Intergeneration correlation values revealed that, the
barbadense
lines in both generations exhibited highly
significant positive correlation for 2.5% SL (0.48) and
significant positive correlation for fiber uniformity
ratio (0.37) and fiber micronaire value (0.29). None of
barbadense in two generations exhibited significant
correlation for fiber maturity ratio, fiber tenacity and
fiber elongation.
1.4 Narrow sense heritability estimates for fiber
quality
The evaluation of parent and progeny provided an
opportunity to compute heritability values following
parent offspring regression method can be utilized for
predicting the response to selection in early and
advanced generations. The results obtained from the
study are presented in Table 4.
Table 4 Estimates of heritability (Narrow sense) for fiber
quality characters in barbadense lines (F
3
/F
5
)
Characters
Barbadense lines (F
3
/F
5
)
2.5% SL (mm)
89
UR %
74
Micronaire value (µg/inch)
63
Maturity Ratio (%)
32
Tenacity (g/t)
41
Elongation %
34
The moderate heritability was noticed for fiber
maturity ratio (32%), fiber tenacity (41%) and fiber
elongation (34%). The high heritability was noticed
for 2.5% SL
(89%), fiber uniformity ratio (74%) and
fiber micronaire value (63%).
2 Discussion
There is a steep rise in production of long staple
cotton, while production of extra long staple, short
staple and even medium staple cotton has come down
drastically. Because of this, India is importing extra
long staple cotton by causing heavy birth on
exchequer and there is a need of improving
performance of interspecific hybrids. This is possible
through genetic improvement of barbadense lines. So
that both productivity and fiber quality of barbadense
improved. An improved barbadense varietal base is
essential for improving performance of interspecific
hybrids. This study also focused attention on
determining whether these barbadense lines can
Cotton Genomics and Genetics