"Interaction between dwarf and semidwarf plants in hexaploid wheat (Triticurn aestivum L.) and the effect of dwarfing genes on coleoptile length, seedling growth and yield traits"

Abstract

The present investigation was undertaken to study the intergenotypic competition between dwarf and semidwarf plants of hexaploid wheat ( Tri ticum aestivum L.) and the effect of dwarfing genes on coleopti.le length, seedling growth and yield traits in six different crosses involving three sc����midw1-1.rf Bangladeshi varieties and two grass dwarf .lines. Interaction between dwarf and semidwarf wheats showed no marked variation with the advancement of generations. Signific..ant variances were found for plant height in mse of repJic.-'l.ticn, cross and the interacticn of location x cross x generation. Frl:'quency distribution for plant height of the random lines were found to be diminished for short statured plants compared to that of the semidwarfs. Frequency distribution for yield per plant revealed the changes in generationmean, and variation from F2 to F6 wer.e cissociated with a decrease in the number of dwarf lines and an increase in the frequency of semidwarf lines. Prior to study the effect of dwarfing genes on coleoptile length, seedling growth and yield traits the height reducing genes were determined by observing the plant height in F2 generation. The Bangladeshi varieties J\kbar and Ananda, and Kanchan were found Lo have the height reducing genes Hht1 and Rht1, respectively. The dwarf lines FM-32 and FM-139 ind i C.:"l.,ted the presence of mi11 gene.---------------