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STUDIES ON HYBRID VIGOUR AND INBREEDING DEPRESSION IN CMS-BASED PIGEONPEA [Cajanus cajan (L.) Millspaugh] HYBRIDS

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Title STUDIES ON HYBRID VIGOUR AND INBREEDING DEPRESSION IN CMS-BASED PIGEONPEA [Cajanus cajan (L.) Millspaugh] HYBRIDS
 
Creator KHIN LAY KYU
 
Contributor SAXENA, K. B
 
Subject hybrids, heterosis, pigeonpeas, fertilizers, yields, developmental stages, genes, planting, inbreeding, inbreeding depression
Cajanus cajan (L.) Millspaugh, HYBRIDS
 
Description An investigation was carried out during kharif (monsoon) season of 2010-11 at
ICRISAT, Patancheru, Hyderabad, to study (i) relative mid-parent heterosis,
heterobeltirosis, and standard heterosis in medium duration disease resistant pigeonpea
hybrids, (ii) inbreeding depression from F1 to F2 generations for important economic
traits, and (iii) genetics of fertility restoration. A total of 22 hybrids were synthesized by
hand pollinating five CMS-lines with 14 restorers during 2009 kharif season. The F1
plants of each hybrid were selfed to obtain F2 seeds. Genetics of fertility restoration was
studied by using F1, F2, and BC1F1 data in four crosses.
Hybrid ICPH 2671 showed higher negative heterosis indicating exploitable
hybrid vigour for earliness. For maturity, six hybrids ICPH 2671, ICPH 3461, ICPH
3762, ICPH 3763, ICPH 4022, and ICPH 4024 exhibited significant negative heterosis.
For plant height ICPH 2671 (11.35%), ICPH 3933 (23.94%), and ICPH 3759 (8.28%)
showed significant positive heterosis over mid parent. Hybrids ICPH 2671, ICPH 2751,
and ICPH 3759 expressed positive heterosis for number of primary branches. Hybrids
ICPH 2671 and ICPH 3933 showed significant positive heterosis over mid and better
parents for pod clusters. A considerable amount of heterosis for number of pods plant-1
ranged from -38.40 to 113.46%, -21.88 to 120.47% and -24.44 to 149.19% over better,
mid and standard parent, respectively. Five hybrids ICPH 2671, ICPH 2740, ICPH
3359, ICPH 3477, and ICPH 4017 exhibited higher positive heterosis at all the three
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bases of estimation. Hybrids ICPH 3477 and ICPH 3758 had significant positive
heterosis over better and mid parents for seed size. Wide range of positive and negative
heterosis was observed for seed yield, hybrid ICPH 2671 (148.94-208.44%) exhibited
the high heterosis in seed yield followed by ICPH 2740 (49.89-121.45%), ICPH 3477
(48.54-119.45%), ICPH 3491 (50.99-134.17%), ICPH 4017 (55.82-184.90%), and
ICPH 4022 (127.23-155.64%) at different levels of heterosis, respectively.
There was no significant inbreeding depression for days to flower and maturity
and plant height. In case of number of pod cluster plant-1, inbreeding depression ranged
from -64.50% (ICPH 3494) to 68.44% (ICPH 4012). For number of pods plant-1 ICPH
2671, ICPH 2740, ICPH 3359, ICPH 3461, ICPH 3758, ICPH 3933, ICPH 4012, and
ICPH 4017 exhibited high heterosis and inbreeding depression. Seventeen out of 22
hybrids, demonstrated significant inbreeding depression for seeds pod-1. For 100-seed
weight, significant inbreeding depression was found in ICPH 3359 (19.61%). For seed
yield plant-1, 14 hybrids showed 44.69 to 73.28% inbreeding depression. These results
indicated the predominance of non-additive gene action. For plot yield, 12 hybrids
exhibited positive heterosis and inbreeding depression ranging from 7.64 to 52.33%. The
results on inbreeding depression suggested that the genes affecting yield showed both
additive and non-additive gene action.
The fertility restoration in pigoenpea hybrids appeared to be governed by two
genes with epistatic interaction. ICPH 2671 and ICPH 2740 which have the same
restorers but different male sterile lines segregated in the ratio of 12:3:1 in F2 and 2:1:1
in BC1 generation showing digenic dominant epistatic interaction, respectively. ICPH
3359 showed a segregation ratio of 9:6:1 and 1:2:1 in F2 and BC1 generation indicating
two major genes governing fertility restoration showing epistasis with incomplete
dominance while ICPH 4012 segregated in the ratio of 9:3:4 and 1:1:2 in F2 and BC1
generations for pollen fertility/sterility.
 
Date 2016-06-09T12:06:08Z
2016-06-09T12:06:08Z
2011
 
Type Thesis
 
Identifier http://krishikosh.egranth.ac.in/handle/1/67090
 
Language en
 
Relation D8864;
 
Format application/pdf
 
Publisher ACHARYA N.G. RANGA AGRICULTURAL UNIVERSITY