Legume Genomics and Genetics 2015, Vol.6, No.4, 1-7
6
Meha/ DMS 01-34-2. These findings agreed with the
reports of Singh et al. (2006), Aliyu et al. (2007) and
Khodambashi et al. (2012) for most of the traits. The
duplicate type of epistasis interaction generally hinders
the improvement by practicing the selection. Hence,
higher magnitude of duplicate type of interaction effect
would not be desirable. It may give promising lines for
respective traits when selection should be made in
delayed after several generations of selection through
single seed decent (SSD) till fixation for accumulating
the favourable genes. The biparental approach is
suggested for the exploitation of these important
complex inherited agro-morphological traits to
recover/ develop the high yielding mungbean. Besides,
NMS exhibited [h] gene effect in both crosses,
indicating the dominance gene action in governing
NMS, may helpful through recombination breeding for
mungbean improvement. NSP in Meha/ DMS 03-17-2
and NSBP in Meha/ DMS 01-34-2 exhibited [d] gene
effect, indicating the additive gene action in governing,
may give transgressive segregants in early generations.
Spreading growth habit was found dominant over
erect in both crosses (Table 4). F
2
and back cross
population score also fit the expected 3: 1 and 1:1,
respectively for growth habit, indicating that these
traits are under the monogenic control and could be
easily exploited in mungbean improvement progr-
amme. Similar findings were also observed earlier by
Khattak et al. (1999) and Sriphadet et al. (2010).
It is observed that the inheritance of yield and its
component traits is too much complex and gene action
is highly influence by type of genetic/ breeding
material used to develop the crosses. The present
study suggests the biparental mating and/ or diallel
selective mating might be rewarding for mungbean
improvement. The monogenic inheritance of growth
habit indicated that possibility to develop the ideal
plant type for high yield from developed population.
3 Materials and Methods
Genetics of some important agro-morphological traits
of mungbean were studied using the F
1
, F
2
, BC
1.1
and
BC
1.2
of a cross between Meha
(spreading growth
habit) as female parent (P
1
) and DMS 03-17-2 and
DMS 01-34-2 (erect growth habit) as male parent (P
2
).
The parents were selected from previous experiment
(Singh et al.,
2013) and crossed in to obtain the
crosses during
kharif,
2012. The F
1
seeds were
subjected to back crossing and selfing during
summer,
2013. These six basic generations were sown in
randomized complete block design (RCBD) with three
replications during
kharif,
2013. 10 competitive
random plants from P
1
, P
2
& F
1
; 15 plants from BC
1:1
& BC
1:2
; 60 plants from F
2
population were randomly
selected from each family in each replications, to
record the observations for agro-morphological traits
viz.,
plant height (PH), number of primary branches
per plant (NPBP), number of secondary branches per
plant (NSBP), number of pods per plant (NPP), pod
length (PL), number of seeds per pod (NSP), seed
index (SI), biological yield per plant (BYP), harvest
index (HI) and seed yield per plant (SYP). The traits
viz.,
days to first flower open (DFFO) and days to
maturity (DM) were computed on plot basis.
Table 4: Segregation ratio for growth habit in two mungbean crosses
Population
Total
Spreading
Erect
Observed
Expected
χ2
Meha
62
62
0
--
--
--
DMS 03-17-2
60
0
60
--
--
--
F
1
57
57
0
--
--
--
F
2
1034
773
261
2.96:1
3:1
0.03
B
1:1
64
31
33
0.93:1
1:1
0.06
B
1:2
59
59
0
--
--
--
Meha
64
64
0
--
--
--
DMS 01-34-2
60
0
60
--
--
--
F
1
53
53
0
--
--
--
F
2
864
659
205
3.21:1
3:1
0.75
B
1:1
68
33
35
0.94:1
1:1
0.06
B
1:2
57
57
0
--
--
--
