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Gene Action for Grain Moisture at Harvest in Maize (zea Mays) L.

S. C. Debnath
Department of Genetics and Plant Breeding, Bangladesh Agricultural University, Mymensingh

Abstract/ Executive Summary:

The genetics of grain moisture at harvest was investigated over locations in a 9X9 diallel set of crosses involving elite maize inbreds. Graphical analysis revealed wide genetic diversity among the parents and partial to complete dominance complicated by some sort of epistasis in the inheritance of this trait. Variance component analysis indicated the importance of additive genetic variance as well as partial dominance in the inheritance of the character, more or less symmetrical distribution of dominant and recessive genes in the parents, and asymmetry of loci exhibiting dominance. The character was observed to be controlled by two to four genes or gene groups exhibiting dominance. Almost equal number of dominant genes were positive and negative in the inheritance of the character. The influence of the environment in the character was drastic.

Keywords: Diallel, Gene, Maize

Location:

Start Date:

End Date:

Program Area: Variety and Species

Commodity: Maize

Objectives:

The purpose of the present study was to study the genetic architecture of grain moisture at harvest in maize over two environments of India.

Methodology:

Nine elite inbreds of maize viz . Eto 25 (P_I), CM 201 (P₂), CM 105 (P₃), Eto 18 (P₄), Eto 297 (P₅), Eto 182-C (P₆), Syn C8b (P₇), Cuba 43 CP₈). and CM110 (P₉). were crossed in all possible combinations during Rabi season of 1978-79. 36 F₁s along with nine parents were grown following randomized block design with three replications. Harvesting of all parents and hybrids was done in a single day when the stalks along with cobs of parents and hybrids dried up indicating that the crop had reached its maturity. Moisture percent- age in grains was determined by Universal Moisture Tester, immediately after harvest, by taking adequate grain sample from two rows of each of five randomly selected ears in each plot: Experimental data were subject to graphical as well as variance component analysis was done.

Source of Information: Bangladesh J. Agtil. Sci. 12 (1) : 43-48 : 1985

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

The analysis of variance showed significant difference among the parents and their crosses. The mean performance of the parents and their hybrids for grain moisture at harvest in percentages. It is evident from that the parent P_I exhibited the lowest grain moisture at harvest followed by the cross P_IX P₆ , indicatinq their superiority with respect to earliness in maturity. is apparent from graphical and component of variance analysis that partial to complete dominance was involved in the inheritance of grain moisture at harvest in the present set of materials. Partial dominance as well as importance of additive genetic variance in the inheritance of this character was also noted. Epistasis was also reported. Since the additive variance was found to be important in the present materials, it can be proposed that any breeding procedure that can exploit the additive portion of genetic component of variation can be used to achieve improvement for early maturity in the present set of materials,

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