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Screening of varieties of durum wheat triticum durum desf. and bread wheat triticum aestivum l. for drought adaptation by measuring in vivo chlorophyll fluorescence quenching



Screening of varieties of durum wheat triticum durum desf. and bread wheat triticum aestivum l. for drought adaptation by measuring in vivo chlorophyll fluorescence quenching



Agronomie (Paris) 8(3): 193-200



Chlorophyll fluorescence was measured in leaves of 25 varieties and 8 new genotypes of durum wheat (Triticum durum Desf.) and 3 varieties of bread wheat (Triticum aestivum L.) submitted to rapid desiccation in air for 4 h. Leaf dehydration modified the shape of the chlorophyll fluorescence induction curves. In particular, fluorescence quenching from the maximum level P to the pseudo-steady state S (estimated by the (P-S)/S ratio) was inhibited. However, this inhibition was shown to be strongly dependent on the drought tolerance of the wheat varieties: in sensitive varieties, the (P-S)/S ratio was spectacularly reduced whereas it remained almost unchanged in very tolerant varieties. Similarly, the photochemical component of the chlorophyll fluorescenec quenching (qQ), determined at the steady state using a modulated fluorescence technique, was more or less affected, depending on the drought tolerance level of the wheat varieties. The results presented in this paper indicated that easily measurable fluorescence parameters, such as (P-S)/S or qQ, could be used in practice to estimate rapidly the resistance of wheat genotypes to drought conditions.

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