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Genetic Diversity in Maize Inbreds Under Excess Soil Moisture Condition

M. Hoque
Bangladesh Agricultural Research Institute (BARI), Gazipur

F. Akhter
Scientific Officer
TCRC, Gazipur

M. Kadir
Principal Scientific Officer
RARS, BARI, Jamalpur

S. Akhter
Scientific Officer
RARS, BARI, Jamalpur

S. Ahmed
Principal Scientific Officer
Plant Breeding Division, BARI, Gazipur, Bangladesh

Abstract/ Executive Summary:

Genetic diversity study was done in 64 maize inbreds grown under excess soil moisture condition.The genotypes were grouped into eight clusters. It was observed that all intercluster distances were larger than all intracluster distances. Such results indicated that genotypes included within a cluster had less diversity among themselves but wider genetic diversity among the inbreds of different clusters. The highest inter cluster distance was observed between cluster IV & VII followed by IV & V , IV & VIII, II & VII and I & IV. The highest intra cluster distance was noticed in cluster V and the lowest was in cluster VII. The highest yield/plant, cob girth, number of rows/ear, number of grains/plant, SPAD value and number of nodes with brace roots were observed in cluster IV. The lowest mean value for yield/plant yield components and dwarf statured plant were observed in cluster VII. The plant height, ear height,days to 50% tasseling and silking, cob length, cob girth, 100 grain weight and SPAD value contributed considerably to total divergence. The genetically diverged genotypes in these distinct clusters could be used as parents in hybridization program for getting desirable hybrid(s).

Keywords: Genetic diversity, Maize, Excess soil moisture condition

Location: At Regional Agricultural Research station, Jamalpur

Start Date: 00-11-2009

End Date: 00-04-2010

Program Area: Variety and Species

Commodity: Maize

Objectives:

To analyze the genetic divergence of maize inbreds under excess soil moisture condition and to develop high yielding and excess moisture tolerant maize hybrids

Methodology:

The experiment was undertaken at Regional Agricultural Research station, Jamalpur during rabi season 2009-10 to estimate genetic diversity among 64 genotypes of maize inbred lines. Seeds of each entry were sown on 08 December 2009 in single sow 2 m long. Spacing was maintained 75 X 20 cm from entry to entry and plant to plant respectively. One plant was kept per hill after thinning. Fertilizers were applied @ 120, 80, 20, 5 and 1 Kg/ ha of N, P₂0₅, K₂O, Zn and B respectively. Other intercultural operations were done according to the necessity to raise the crop uniformly. Irrigations were applied continuously for 7 days maintaining with a ponding depth of 9-11cm induced at knee high stage of maize plants. Genetic divergence was estimated following Mahalanobis (1936) generalized distance (D2) extended by Rao (1952). Tocher’s method (Rao,1952) was followed for determining the group constellations. Canonical analysis was also done according to Rao (1964) to confirm the results of cluster and D2 analysis. Based on D2 values, sixty four inbreds were grouped into clusters using the GENSTAT 5.0 computer software.

Source of Information: Bangladesh J. Agril. Res. 42(2): 379-385, June 2017 ISSN 0258-7122 (Print), 2408-8293 (Online)

Article Link (Online Journal):

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

The crosses between inbred lines of cluster IV with those of cluster VIII are expected to exploit heterosis for yield & short statured plant but crosses between the inbred lines of clusters III & IV are expected to high yielding hybrid maize. Cob length, cob girth, 100 grain weight, plant height, ear height, days to tasseling, days to silking and SPAD value contributed maximum towards divergence. Hence major emphasis should be given on them for selecting parents for hybrids in maize. From this study it can also be concluded that promising results concurring diversed gene pool of desired plant traits could be obtained in this piece of research work.

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