Developmental responses to vernalization in wheat deletion lines for chromosomes 5A and 5D |
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| Authors: | E. M. Whitechurch J. W. Snape |
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| Affiliation: | Departamento de Production Vegetal, Facultad de Agronomia, Universidad de Buenos Aires, Avenue San Martin 4453, 1417 Buenos Aires, Argentina. E-mail:;John Innes Centre, Norwich Research Park, Colney, Norwich NR4 7UH, UK |
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| Abstract: | The aim of this investigation was to test the developmental patterns of deletion lines, generated for chromosome arms 5AL and 5DL in the variety ‘Chinese Spring’ (CS) under vernalized and non‐vernalized treatments. Plants were grown in controlled conditions under saturating daylength. Time to heading and the duration of particular phases before flowering were recorded, and leaf and spikelet production rates and numbers were analysed. The lines lacking Vrn‐A1 and Vrn‐D1 were delayed in time to heading under non‐vernalized conditions, because of the lengthening of the emergence to floral initiation phase (EM‐FI) and the terminal spikelet to heading phase (TS‐H). Differences in final leaf numbers corresponded to longer durations of the EM‐FI phase. The absence of Vrn‐A1 and Vrn‐D1 apparently decreased the number of spikelets by a lower primordium production rate, even though the duration of the FI‐TS phase was longer or equal to CS. The sensitivity to vernalization in lines where the Vrn genes were deleted was much higher. |
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| Keywords: | Triticum aestivum deletion lines flowering time phase duration vernalization |
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