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The quantum yield of photosynthetic electron transport evaluated by chlorophyll fluorescence as an indicator of drought tolerance in durum wheat

Published online by Cambridge University Press:  27 March 2009

Z. Flagella
Affiliation:
Istituto di Produzioni e Preparazioni Alimentari, Università di Bari, Sede di Foggia, via Napoli 25, 71100 Foggia, Italy
D. Pastore
Affiliation:
Dipartimento di Scienze Animali, Vegetali e dell' Ambiente, Università del Molise, 86100 Compobasso, Italy
R. G. Campanile
Affiliation:
Istituto Sperimentale per la Cerealicoltura, SS 16 Km 675, 71100 Foggia, Italy
N. Di Fonzo
Affiliation:
Istituto Sperimentale per la Cerealicoltura, SS 16 Km 675, 71100 Foggia, Italy

Summary

The chlorophyll fluorescence parameters ΔF/Fm′ and Fv′/Fm′, related respectively to the quantum yield of photosynthetic electron transport and to the efficiency of excitation capture by the open centres of photosystem II, have been evaluated as possible indicators of drought tolerance in durum wheat. ΔF/Fm′ and Fv′/Fm′ measurements were carried out on excised leaves, both control and dehydrated, of 25 cultivars. ΔF/Fm′ and Fv′/Fm′ values were obtained at two times after the start of fluorescence measurement: at 14 s, i.e. during the induction curve (ΔF/Fm14s and Fv′/Fm14s) and at 200s, i.e. at steady state fluorescence (ΔF/Fm200s and Fv′/Fm200s).

In dehydrated leaves a mean significant decrease of 20% (P < 0·001) was observed in ΔF/Fm14s values. In contrast, no great differences were observed between control and dehydrated leaves with regard to ΔF/Fm200s, Fv′/Fm14s and Fv′/Fm200s.

The percentage decrease of ΔF/Fm14s after dehydration was correlated with the drought susceptibility index (DSI) of the cultivars, evaluated on a yield basis and a significant correlation (r = 0·72, P < 0·001) was found.

Type
Crops and Soils
Copyright
Copyright © Cambridge University Press 1995

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