Stability Analysis in Baby Corn (Zea mays L.) Hybrids
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Date
2020
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MPUT, UDAIPUR
Abstract
The present investigation consisted of a total of 45 hybrids along with 18
parents (15 inbred lines and 3 testers) and 2 checks. A total of 65 entries were
evaluated in randomized block design with three replications over three locations
(Two during Kharif-2019 and one during Rabi 2019-20) at Instructional farm,
Rajasthan College of Agriculture, Udaipur, Rajasthan (Kharif-2019 and Rabi 2019-
2020) and Agriculture Research Sub Station, Vallabh Nagar, Udaipur, Rajasthan
(Kharif-2019). Observations were recorded on eighteen characters for per se
performance, estimates of the extent of heterosis, combining ability, genotype ×
environment interaction and stability parameters.
The pooled analysis of variance revealed that the significant mean sum of
squares due to environments for all the traits except TSS indicating appreciable
variation among the environments selected for this investigation. Highly significant
differences among genotypes were observed for all the characters studied except days
to last cob silking. The material may therefore, be considered as diverse enough for
the study planned. The crosses × environment interactions were significant for all the
characters indicating existence of non-linear response of crosses to the changing
environments. The analysis of variance for individual environment indicated
significant differences among genotypes for all the traits indicating the heritable
nature of inheritance of these traits.
The per se performance indicated that line EIQ-235 expressed maximum mean
value for number of cobs per plant (2.6), husked cob weight (46.2), de-husked cob
weight (8.6), baby corn cob length (8.4), baby corn cob girth (4.6), husked cob yield
per plant (119.4) and de-husked cob yield per plant (22.1) while minimum mean value
in crude protein content (6.9). The maximum mean value was reported by cross EIQ-
* Research Scholar, Department of Genetics and Plant Breeding, Rajasthan College of
Agriculture, MPUAT, Udaipur-313001 (Raj.)
** Professor, Department of Genetics and Plant Breeding, Rajasthan College of Agriculture,
MPUAT, Udaipur-313001 (Raj.)
103 × EI-2156 for number of cobs per plant (2.9), husked cob yield per plant (51.9)
and de-husked cob yield per plant (9.7).
The perusal of estimates of economic heterosis for de-husked cob yield and its
contributing characters revealed that on pooled basis, maximum and significantly
desirable economic heterosis was depicted by cross EIQ-103 x EI-2156 (13.51). The
cross combinations viz., EIQ-103 × EI-2156 (13.51) for de-husked cob yield per plant
, EIQ-180 × EI-2156 (16.02), EIQ-103 × EI-2156(10.54) and EIQ-180 × EI-2518-4
(9.84) for husked cob weight, EIQ-103 × EI-2156 (17.26) for husked cob yield per
plant, EIQ-180 × EI-2156 (16.68) for husked cob yield per plant were identified
suitable for yield and yield contributing traits while crosses viz., EIQ-180 × EI-2518-
4, EIQ-104 × EI-670-2, EIQ-180 × EI-670-2, EIQ-225 × EI-670-2, EIQ-104 × EI-
2518-4 were identified for quality parameters.
The inbred lines viz., EIQ-103 (2.297), EIQ-180 (1.534) and EI-1104-1
(1.510) were good general combiners for yield and its contributing characters in all
the environments and on pooled analysis. Crosses EI-2177-2 × EI-670-2 (3.25), EI-
1104-1 × EI-670-2 (3.41), EI-561-2 × EI-2518-4 (5.08), EI-561-2 × EI-2518-4 (2.15)
expressed maximum and significantly (positive) desirable sca effects in E1, E2, E3 and
on over the environments, respectively for de-husked cob yield.
Crosses EIQ-103 × EI-2156, EIQ-180 × EI-2518-4 and EIQ-103 × EI-670-2
were suitable for different environmental conditions for yield and yield contributing
traits. The cross combinations viz., EIQ-103 × EI-2156 and EI-1104-1 × EI-2156 were
found stable in all kinds of the environments. The crosses EI-2173 × EI-2156 and
EIQ-235 × EI-2518-4 were found suitable for unfavourable environment.
In the present study, one cross viz., EIQ-103 × EI-2156 had high per se
performance (28.10), high standard heterosis (13.51), significant sca effects (1.40)
and showed stability for de-husked cob yield per plant (s2di =0 and bi = unity). Hence,
suitable for different environmental conditions and thus could be included in
multiplication testing programmes to identify the suitability as commercial hybrid in
different growing seasons of Rajasthan.
Description
Stability Analysis in Baby Corn Hybrids
Keywords
Citation
Bangarwa S.K. and Dubey R.B.