Genetic diversity, combining ability and stability studies in Sorghum.
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Date
1996
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Mahatma Phule Krishi Vidyapeeth, Rahuri.
Abstract
The investigation was undertaken during the period
from 1993 to 1995 at Rahuri to study genetic diversity in two
types of soil viz., light and medium soil in rabi season and
combining ability and stability analysis in kharif season
under light and medium soil and rabi season under light and
medium soil in respect of eleven characters in sorghum. The D statistic showed that there was adequate
2 diversity among the genotypes with D values ranging from
11.40 to 2501.22 (light soil type condition) and from 13.79 to
2 2297.07 (medium soil type condition). On the basis of D
values, 50 genotypes were grouped into 13 and 16 clusters
under light and medium soil type conditions, respectively.
Clustering pattern of these genotypes did not necessarily
follow the geographical distribution. On the basis of inter
cluster distance, cluster mean and p_e_r s_e performance IS-9318,
IS-3578, SPV-1221, RSLG-17, RSLG—49, SPV-1209, SPV-1211 and
RSLG-12 genotypes have been identified for hybridization
programme under both light and medium soil type conditions,
while the genotypes viz. , 15-9318:.-, IS-4993, IS-517, IS-3578,
IS-5031, SPV-1221, RSLG-17, RSLG-49, SPV-1209, SPV-1211 and
RSLG-12 for light soil and IS-9318, IS-3578, SPV-1209,
Lokhandi, SPV-1211, RSLG-3, RSLG-12, RSLG-17, RSLG-43, RSLG
49, SPV-1221, SPV-1219 and RSLG-19 for medium soil have been
identified for hybridization programme.
The studies on combining ability indicated that
there was considerable amount of genetic variability among the parents for all the characters under study. The male sterile
lines 116A, 36642A, 117A and 42A and restorers SPV-475, SPV
938, SPV-462, SPV-1010, SPV-655, SPV-1090, Sel.3 and CSV-14R
were found to be good general combiners for majority of the
important characters. The crosses 116A x SPV-475, 116A x SPV
462, 36642A x SPV-1010, 36642A x SPV-946, 36642A X SPV- 475,
36642A X SPV- 1025, 42A x SPV-655, 42A x SPV-475, 42A x SPV
462 and 36542A x CSV-14R exhibited good sea effects for grain
yield and most of its components. Additive gene action was
found to be predominant for days for 50 per cent flowering,
plant height and panicle length in medium soil during kharif
season and days for maturity in light soil during rabi season.
While, non-additive gene action was found to be predominant
for flag leaf area, number of leaves per plant, panicle
breadth, 1000-grain weight, grain yield per plant, panicle
weight, fodder yield, plant height and panicle length in
medium soil during kharif season and days for maturity in
light soil during rabi season.
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