Basic HTML Version
Plant Gene and Trait, 2013, Vol.4, No.2, 4
-
8
http://pgt.sophiapublisher.com
6
Table 3 Mean inter and intra cluster distances
for recombination breeding. The cluster V, which had
constituted only two genotype (Nilakottai Local and
Annamalai), was found to exhibit minimum values for
plant height, fruit circumference, calyx length and
fruit borer infestation and maximum in number of
branches per plant, fruit length, fruit pedicel length,
number of fruits per plant and ascorbic acid content.
The clusters differed with respect to their per se
performance. A close look at Table 4 reveals that the
clusters excelled in respect of different characters.
Cluster
Ⅱ
and
Ⅴ
were more diverse with very high
fruit yield per plant and solitary in nature. Cluster
Ⅳ
and
Ⅵ
were also solitary in nature comprising early
genotypes with respect to days to flowering. Cluster
Ⅱ
was good for fruit yield and related characters.
Cluster
Ⅳ
was also good having high phenol content
and lower incidence of liitle leaf incidence.
The cluster mean for fruit yield per plant was highest
in cluster
Ⅱ
(Alavayal Local and Palamedu Local)
followed by cluster
Ⅴ
(Nilakottai Local and Annamalai)
and
Ⅲ
(Sedapatty Local (Green), Melur local, Keerikai
Local, Sedapatty Local (Blue) and KKM 1). High cluster
mean for most of the yield contributing traits coupled
with inter cluster distance was found in cluster V and
cluster
Ⅱ
which indicate the possibility of obtaining
high heterotic vigour and selection of superior segre-
gants by inter crossing genotypes from these clusters
as reported by Mehta et al .(2004).
2.4 Contribution of characters to genetic divergence
In addition to the knowledge on the degree of
divergence, the study also revealed the contribution of
different characters studied towards total genetic
divergence (Table 5). The character that appears the
maximum number of times ranks first and greater is
its contribution to genetic divergence. In the present
investigation, an assessment of the contribution of
different characters indicated that, the character fruit
yield per plant was the maximum contributor for
genetic divergence, followed by little leaf incidence,
fruit circumference, total phenol content, shoot borer
infestation and fruit borer infestation. The importance
of fruit circumference in genetic divergence of brinjal
had been observed by Dhankar et al. (1978), Babu and
Patil (2004) and Prabakaran (2010). The relative
contribution of plant height, days to first flowering,
number of branches per plant, fruit pedicel length,
clayx length, number of fruits per plant and ascorbic
acid content for divergence among the genotypes was
Table 4 Cluster means for fifteen characters in brinjal
Clusters/
Characters
X1
X2
X3
X4
X5
X6
X7
X8
X9
X10
X11
X12 X13 X14 X15
Ⅰ
91.26 77.84 18.42 6.72 5.00 12.44 3.78 29.11 43.53
26.39
39.24 16.70 13.09 48.29 1.26
Ⅱ
88.75 75.92 20.58 7.63 5.33 16.12 3.54 24.65 73.98
21.10
34.56 14.66 12.30 62.79 1.81
Ⅲ
89.91 75.24 20.78 6.97 4.67 11.99 4.11 30.30 54.83
22.72
40.59 19.28 12.02 59.90 1.64
Ⅳ
96.51 72.28 17.94 6.74 5.40 14.64 3.31 30.16 42.64
22.17
34.23 11.25 12.22 64.14 1.26
Ⅴ
79.54 74.38 22.95 10.91 5.57 10.40 3.19 31.68 52.95
22.28
34.04 16.18 14.10 44.87 1.69
Ⅵ
79.93 73.32 18.50 6.85 4.75 14.77 4.41 30.93 50.34
23.08
42.61 19.75 13.82 29.46 1.56
Note: X1 – Plant height (cm); X2 – Days to first flowering; X3 – Number of branches per plant; X4– Fruit length (cm); X5 – Fruit
pedicel length (cm); X6 – Fruit circumference (cm); X7 – Calyx length (cm); X8 – Number of fruits per plant; X9 – Average fruit weight
(g); X10 – Shoot borer infestation (%); X11 – Fruit borer infestation (%); X12 – Little leaf incidence (%); X13 – Ascorbic acid content
(mg/100g); X14 – Total phenols content (mg/100g); X15 – Fruit yield per plant (kg)
1
2
3
4
5
6
Ⅰ
20.557 80.724 40.481 69.150 68.848 35.138
Ⅱ
30.037 89.912 41.737 107.502 69.922
Ⅲ
50.089 82.374 67.767 50.969
Ⅳ
43.947 98.056 67.607
Ⅴ
54.685 78.221
Ⅵ
0.000