Basic HTML Version
Triticeae Genomics and Genetics 2014, Vol.5, No.2, 1-11
http://tgg.biopublisher.ca
3
significant and 12 were non-significant. Maximum
positive heterobeltiosis was shown by the cross
Maya/Pavon×Shalimar-88 with a value of (7.26%)
followed by Shalimar-88×Maya/Pavon (6.73%).
Maximum negative value was shown by the cross
combination Inqilab-91 × Shalimar-88 (-5.47%).
As far heterobeltiosis is concerned under stress
environment 24 crosses showed highly significant but
negative heterobeltiosis over better parental values.
Among these 24 crosses Weebli-1×Maya/Pavon
showed the highest value of negative heterobeltiosis
(-14.41%) followed by (-12.02%) by cross combination
Punjab-85×Uqab-2000 and Maya/Pavon×Chenab-2000
(-11.76%). Three crosses showed significant but
negative values. While 9 crosses showed negative and
non-significant results. Five crosses showed positive
but non-significant results and one cross i.e.
Punjab-85×Shalimar-88 showed significant and
positive heterobeltiosis.
1. 4 Heterosis for peduncle length under normal
and heat stress conditions
Heterosis studies for peduncle length showed that
under normal conditions out of 42 crosses only 9
combinations showed positive results in which only 1
cross showed highly significant heterosis and 1 cross
showed significant results. While 7 crosses showed
positive and non-significant results. Thirty three
crosses revealed negative heterosis. Highly significant
negative heterosis was shown by 8 crosses and 9
crosses showed significant results, while 16 crosses
showed negative and non-significant results.
Maximum positive heterosis was shown by the cross
combinations Maya/Pavon × Shalimar-88 (13.67%)
followed by the cross combination Punjab-85×
Shalimar-88 (9.46%). However, maximum decrease
was shown by the cross combination Weebli-1 ×
Chenab-2000 (-18.22%) followed by the cross
Uqab-2000×Inqilab-91 (-15.33%). For heterotic
effects of peduncle length under heat stress conditions
30 crosses showed negative values in 42 crosses
studied. Among these 30 crosses 18 showed highly
significant results, 3 were significant and 9 were
negative and non-significant. Among remaining 12
crosses which showed positive results 1 cross showed
positive and highly significant results while 2 crosses
were positive and significant and 9 were
non-significant. Following crosses i.e., Maya/Pavon×
Weebli-1 (-28.02%) followed by Uqab-2000 ×
Inqilab-91 (-20.60%) and Inqilab-91×Weebli-1
(-20.14%) showed maximum negative values.
However, maximum positive heterosis was shown by
the cross Weebli-1×Chenab-2000 (14.36%) followed
by Chenab-2000×Punjab-85 with a value of (12.11%).
1.5 Heterobeltiosis for peduncle length under
normal and heat stress conditions
Percent increase or decrease of first filial generation
crosses as compared to their better parental values
under normal conditions indicated that 39 out of 42
crosses showed decrease in heterobeltiosis values.
However, 12 crosses were negative and highly
significant, 11 were significant and 16 were negative
and non-significant. Among remaining 3 crosses only
one cross was positive and highly significant
Maya/Pavon×Shalimar-88 (12.64%) and 2 were
non-significant. Among crosses showing maximum
decrease were Weebli-1×Chenab-2000 (-22.80%)
followed by the cross combination Uqab-2000 ×
Punjab-85 (-21.98%).
Heterobeltiosis studies for stress environment revealed
that 40 crosses showed negative values. Among these
40 crosses 26 showed negative but highly significant
results and 10 crosses showed negative and
non-significant results. Among the highly significant
crosses Maya/Pavon × Weebli-1, Maya/Pavon×
Chenab-2000 and its reciprocal cross showed the
highest negative values of (-39.52%), (-35.69%) and
(-34.83%) respectively, followed by the cross
Weebli-1×Maya/Pavon (-32.74%). Positive and
non-significant heterobeltiosis was shown by the
crosses Chenab-2000 × Punjab-85 (3.44%) and
Weebli-1 × Uqab-2000 (0.17%).
1.6 Heterosis for Tillers per plant under normal
and heat stress conditions
Percentage increase or decrease of F
1
over mid
parental value under normal conditions showed that
for tillers per plant under normal conditions only 5
crosses showed positive heterosis over mid parental
values. Out of these 5 crosses 3 crosses showed highly
significant heterosis and 2 crosses showed
non-significant heterosis. Only one cross showed no
heterosis. Remaining 36 crosses showed negative
heterosis. Out of them 24 crosses were negative and
highly significant, 2 crosses were significant and 10