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Plant Gene and Trait, 2013, Vol.4, No.2, 4
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Table 1 Clustering pattern of 14 genotypes of brinjal
Cluster
Number of
genotypes
Genotypes
Sources
Ⅰ
2
Kariapatty Local
Kariapatty, Virdhunagar D.t, Tamil Nadu
Alagarkovil Local
Alagarkovil, Madurai D.t, Tamil Nadu
Ⅱ
2
Alavayal Local
Alavayal, Madurai D.t ,Tamil Nadu
Palamedu Local
Palamedu, Madurai D.t, Tamil Nadu
Ⅲ
5
Sedapatty Local (Green)
Sedapatty, Madurai D.t, Tamil Nadu
Melur local
Melur, Madurai D.t, Tamil Nadu
Keerikai Local
Sempatty, Dindigul D.t, Tamil Nadu
Sedapatty Local (Blue)
Sedapatty, Madurai D.t, Tamil Nadu
KKM 1
Agricultural College and Research Institute, Tuticorin, Tamil Nadu
Ⅳ
2
Singampunari Local
Singampunari, Sivagangai D.t, Tamil Nadu
EP 65
Vegetable Research Station, Palur, Tamil Nadu
Ⅴ
2
Nilakottai Local
Nilakottai, Dindigul D.t, Tamil Nadu
Annamalai
Vegetable Research Station, Palur, Tamil Nadu
Ⅵ
1
Punjab Sadabahar
Tamil Nadu Agricultural university, Coimbatore
origin. Geographic diversity, though appear as an
important factors it seems that it is not the only factor
determining the genetic divergence. It also indicates
that the factors other than geographical diversity may
also be responsible for such grouping types. Singh and
Prasad (1991) opined that the geographical distribution
need not directly be related to genetic diversity as
estimated by D
2
statistics. A similar finding was reported
by Parmanick et al. (1992), Tambe et al. (1992) and
Yadav et al. (1996). In contrast, the other clusters
Ⅰ
,
Ⅱ
,
Ⅳ
and
Ⅴ
had two genotypes each coming from
different geographical origin. Whereas, Cluster
Ⅲ
had five genotypes and among five genotypes, two
which was from same geographical location.
2.2 Intra and Inter cluster distances
Average intra and inter cluster D
2
values of fourteen
genotypes have been studied (Table 2; Table 3). Among
the six clusters, the clusters
Ⅱ
,
Ⅲ
,
Ⅳ
and
Ⅴ
were
found to be highly divergent from the others, as it had
constituted two genotypes. The values show that the
cluster
Ⅴ
had the maximum intra D
2
value, followed
by cluster III. This is indicative of the fact that the
genotypes included in these clusters are very diverse.
The inter cluster D
2
value was found to be maximum
between cluster
Ⅱ
and
Ⅴ
followed by
Ⅳ
and
Ⅴ
.
The genotypes belonging to clusters
Ⅱ
,
Ⅲ
,
Ⅳ
and
Ⅴ
could have greater genetic divergence and hence
intermating between the genotypes belonging to them
would give more transgressive segregates in advanced
generations. Selection of genotypes belonging to
clusters with maximum inter cluster distance had also
been proposed by Mehta et al. (2004), Patel et al.
(2004) and Prabakaran (2010) in brinjal.
2.3 Cluster mean for different characters
The cluster mean values serve for selection of parents
Table 2 Mean inter and intra cluster D
2
values
1
2
3
4
5
6
Ⅰ
422.609
6 516.429
1 638.744
4 781.773
4 740.012
1 234.649
Ⅱ
902.229
8 084.151
1 742.012
11 556.582
4 889.085
Ⅲ
2 508.924
6 785.456
4 592.343
2 597.796
Ⅳ
1 931.351
9 614.953
4 570.679
Ⅴ
2 990.482
6 118.501
Ⅵ
0.000