School of Genetics, Tamil Nadu Agricultural University ...

Indian J. Genet., 60(2): 259-260 (2000) Short Communication

POTENTIAL OF INTERSPECIFIC HYBRIDIZATION FOR DEVELOPING RATOONABLE FORAGE SORGHUM

Downloaded From IP - 122.178.189.197 on dated 4-Oct-2013

www.IndianJournals.com

Members Copy, Not for Commercial Sale

M. RAVEENDRAN, S. R. SREE RANGASAMY AND N. SENTIflL

School of Genetics, Tamil Nadu Agricultural University, Coimbatore 641 003 (Received: December, 1998; accepted: May, 2000)

The present study was undertaken with an aim to develop a high yielding, ratoonable fodder sorghum through interspecific hybridization. F1 hybrids were synthesized between CO 27 (2n = 20) and Sorghum halepepse (2n = 40). The F1 hybrids were evaluated along with the parents. In the F1 generation, 20 ear heads were allowed for open pollination and 10 earheads were allowed for self pollination. Collected seeds were raised as 30 F2 families along with the parents. Observations were recorded at 50% flowering on vegetative yield and its components. The statistics like mean, standard error and variance were calculated as per standard procedures. The open pollinated population when compared to selfed population (Table 1) registered desirable value of mean for earliness, number of tillers (20% superiority over selfed ones, 43 plants), leaf lib ratio, plant height, stem girth, biomass yield (5%, 11 plants), decrease in HCN content (SOlo, 9 plants), ratooning ability (30%, 60 plants) and increase in crude protein (20%,42 plants). Considering the mean, variability and heritability together as a criterion for selection, the open pollinated population is preferred for fodder attributes because it registered desired mean with high variability and heritability for traits like number of tillers, plant height, biomass yield and crude protein content. The selection may be postponed to later generations because of low genetic advance for all the fodder traits excepting the biomass yield. The later generations can be raised by making intercrosses among the segregants or allowing them for open pollination. Desirable increase in fodder attributes in later generations was reported by Baktleit [1] in sorghum sudan grass progenies.

M. Raveendran et al.

260

[Vol. 60/ No. 2

Table 1. Estimation of genetic parameters in F2 Mean ± SE

Parameter

c.Y. (%)

Broad sense Expected heritability (%) genetic advance

Days to flowering

a.p S.P. Number of tillers

a.p. S.P. Number of nodes

Downloaded From IP - 122.178.189.197 on dated 4-Oct-2013

www.IndianJournals.com

Members Copy, Not for Commercial Sale

a.p. S.P. Number of leaves

a.p. S.P. Leaf LIB ratio

a.p.

S.P. Plant height (cm)

a.p.

S.P. Earhead LIB ratio

a.p.

S.P. Stem girth (cm)

a.p.

S.P. Biomass yield (g)

a.p.

S.P. Crude protein (%)

a.p.

S.P. HCN content (ppm)

a.p.

62.9 ± 3.7 64.3 ± 3.6

2.5 2.5

48.0 47.0

3.1 3.0

3.4 ± 0.3 2.9 ± 0.6

16.4 12.4

86.0

5.0

8.07 ± 0.6 9.39 ± 0.6

4.6 1.8

45.0 41.0

0.5 0.4

9.11 + 1.1 10.2 ± 1.1

6.9 6.4

68.0 68.0

1.3 1.3

15.4 ± 2.2 14.7 ± 1.3

11.6 9.9

59.0

2.3

269.7 ± 18.5 244 ± 15.4

6.3 5.4

66.0 52.0

21.5 14.1

2.7 ± 0.4 3.0 ± 0.5

5.2 4.8

84.0 89.0

0.7 0.8

4.4 ± 0.4 4.7 ± 0.5

6.1 10.4

77.0 79.0

0.6 0.6

558 ± 235.7 554 ± 103.1

31.0 15.0

92.0 59.2

387.6 107.1

8.8 ± 1.1 9.2 ± 0.8

9.8 4.8

98.0 95.0

1.9 1.3

24.7 21.5

99.0 99.0

54.4 38.7

a.p 91.8 ± 31.2 S.P. 83.8 ± 22.2 = Open pollinated; S.P. = Self pollinated

REFERENCE 1.

B. R. Baktleit. 1990. Response of selection for forage traits in sorghum sudan grass hybrids. Assiut.

J.

Agric. Sci., 21: 53-63.