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Cotton Genomics and Genetics
69
amount is transpired through the aerial parts of the
plants. Thus, only 5 per cent of the absorbed water is
retained in the plants and remaining 95 per cent is lost
through aerial parts the leaves are most important for
transpiration.
Heterosis of F
1
over mid parent (MP) and commercial
check (MRC 6918 and DCH 32) were calculated by
methods of Turner (1953) and Hayes et al. (1955) as
given below.
Per cent heterosis in F
1
over mid parent (MP) =
(
---
F
1
-
----
MP)/MP × 100
Where, Mid parent (MP) = (P
1
+P
2
)/2
Per cent heterosis in F
1
over commercial check (CC)=
(F
1
-CC)/CC × 100
Where, MP = Mid parent, CC = Commercial check
Mean sum of squares due to error from RBD analysis
was considered to compute standard error (S.E.) of
estimated heterosis as follows.
S.E. for heterosis over mid parent
S.E. (Hmp) = [(3/2 × EMS)/r]
0.5
S.E. for heterosis over commercial check
S.E. (Hcc) = (2 × EMS / r)
0.5
Where, EMS = Error mean sum of squares
The critical difference values in each case were
worked out by multiplying their corresponding S.E.
values with table ‘t’ value at error degree of freedom
at 5 and 1 per cent levels of significance.
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Cotton Genomics and Genetics