Effects of cultivar norin 10 and tom thumb dwarfing genes on morphology physiology and abscisic acid production in wheat triticum aestivum

King, R.W.; Gale, M.D.; Quarrie, S.A.

Annals of Botany 51(2): 201-208


ISSN/ISBN: 0305-7364
Accession: 005297596

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The pleiotropic effects of 3 genetically related dwarfing genes were investigated in near-isogenic lines of wheat. The cv. NORIN 10 semi-dwarfing alleles, Rht 1 and Rht 2, and the cv. Tom Thumb allele, Rht 3, were assessed for effects on some vegetative morphological and physiological characters. The Rht alleles affected leaf size with a resultant decrease in leaf area of the whole plant. Rht 3, which had the most marked effects reduced leaf area in young plants by as much as 30%. Although flag leaf dimensions and stomatal distributions of the flag leaf were altered, the gene had no effect on its area, stomatal conductance or net CO2 exchange rate. Comparisons of Rht and tall plants revealed no differences in the abscisic acid (ABA) levels of either turgid or partially dehydrated leaves.