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Genetic Variation and Association of Some Physiological Traits Affecting Grain Formation in Sparing Wheat

Md. Shamiul Alam
MS Student
Genetics and Plant Breeding, Bangladesh Agricultural University, Mymensingh

Abstract/ Executive Summary:

The present research work was carried out with 18 spring wheat genotypes in the field laboratory of the Department of Genetics and plant Breeding, Bangladesh Agricultural University, Mymensingh, during November, 2000 to March, 2001 . The main aim of the present study was to asses genetic variation among the genotypes for some physiological characters. yield and yield components. heritability. genetic advance and association of different characters. Data on leaf relative water content excised leaf water loss, straw weight plant^-1, biomass plant^-1 and yield and yield components were recorded. A wide range of genetic variability was observed for leaf relative water content, excised leaf water loss. straw weight plant^-1 biomass plant^-1 and yield components. The magnitude of genotypic and phenotypic coefficient of variation was high for excised leaf water loss, biomass plant^-1 spikes plant^-1 and grains spike•', and moderate for leaf relative water content and spikelets spike^-1. High heritability and high genetic advance were recorded for straw weight plant^-1 biomass plant^-1 spike plant^-1 spikelets spike^-1 grains spike^-1 100 grain weight and yield plant^-1; Leaf relative water content had moderate heritability and moderate genetic advance. Excised leaf water loss showed positive correlation with spikes plant^-1 and significant negative correlation with 100 grain weight and yield plan^-1 Leaf relative water content had positive correlation ith excised leaf water loss, spikes plant^-1 biomass plant^-1 and yield plant^-1; Spikes plant^-1 showed positive correlation with straw weight plant^-1 biomass plant^-1 and yield plant^-1 and negative correlation with spikelets spike^-1 (significant) and grains spik^-1 Spikelets spike^-1 was positively correlated with grains spike^-1 Grains spike^-1; was found to have significant negative correlation with 100 grain weight but positive correlation with yield plant ^-1 The relationship between straw weight and biomass plant^-1 was significant and positive. Biomass plant^-1 had positive relationship with yield plant^-1.

Keywords: Genetic variation, Wheat, Physiological traits, Physiological characters

Location: Department of Genetics and Plant Breeding, Bangladesh Agricultural University, Mymensingh

Start Date: 00-11-2000

End Date: 00-03-2001

Program Area: Variety and Species

Commodity: Wheat

Objectives:

i) Asses genetic variation among the genotypes for physiological characters, yield and yield components,

ii) Estimate genetic parameters related to their prediction of inheritance,

iii) Examine the relationship of physiological traits with yield and yield components and finally

iv) To identify the high yield potential genotypes of wheat.

Methodology:

The experiment was conducted at the field laboratory of the Department of Genetics and Plant Breeding, Bangladesh Agricultural University, Mymensingh at Nov. 2000- March, 2001. The materials of the experiment consisted of 18 genotypes of spring wheat. These were collected from Wheat Breeding Project of the Department of Genetics and Plant Breeding, BAU, Mymensingh. The experiment was set up in a randomized complete block design with three replications. The plot size was aet up in a randomized complete block design with three replication. Data on leaf relative water content, excised leaf water loss, biomass plant^-1, straw weight plant^-1, spikes plant^-1, spikclets spike^-1, grains spike^-1, 100-grain weight and yield plant¹ were recorded. Ten randomly selected plants from the middle two rows were used for post harvest observations.

Source of Information: MS Thesis, Nov. 2011, Department of Genetics and Plant Breeding, Bangladesh Agricultural University (BAU)

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

The result of path coefficient revealed the considerable amount of negative direct effect of excised leaf water loss at 4 hours after excision on yield plant^-1. This trait also showed considerable amount of negative indirect effect on yield plant^-1 via 100-grain weight. The direct effect of spikes plant^-1; on yield plant^-1 was positive. This trait had low magnitude of indirect positive effect on yield plant^-1; through leaf relative content, straw weight plant^-1 and biomass plant^-1. The direct effect of spikelets spike^-1; on yield plant^-1; was small and positive. Grains spike^-1; had a positive direct effect on yield plant^-1 and the magnitude of this effect was high. Hundred grain weight showed negative direct effect on yield plant^-1; This trait displayed low magnitude of negative indirect effect on yield plant^-1 through leaf relative water content, spikelets spike^-1, straw weight plant^-1 and biomass plant^-1. Straw weight plant^-1 had positive direct effect on yield plant^-1 and magnitude of this effect was low.

Knowledge Management: Thesis