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Journal of Experimental Botany, Vol. 54, No. 386, pp. 1415-1420, May 1, 2003
© 2003 Oxford University Press

Physiological characterization of ‘stay green’ mutants in durum wheat

Received 27 September 2002; Accepted 5 February 2003

G. Spano5,1,2, N. Di Fonzo1, C. Perrotta3, C. Platani1, G. Ronga1, D. W. Lawlor4, J. A. Napier2 and P. R. Shewry2

1 Experimental Institute of Crop Research, S.S 16 km 675-71100 Foggia, Italy
2 Long Ashton Research Station, Department of Agricultural Sciences, University of Bristol, Long Ashton, Bristol BS41 9AF, UK
3 Department of Biological Science, University of Lecce, 73100 Lecce, Italy
4 Rothamsted Research, Harpenden, Hertfordshire AL5 2JQ, UK

5 To whom correspondence should be addressed. Fax: +39 0881 713150. E-mail: g.spano{at}unifg.it

Four mutants with delayed leaf senescence were selected from seed of durum wheat mutagenized with ethylmethane sulphonate. Changes in net photosynthetic rate, efficiency of photosystem II and chlorophyll concentration during the maturation and senescence of the flag leaves of both mutant and parental plants were determined under glasshouse conditions. The four mutant lines maintained photosynthetic competence for longer than the parental line and are therefore functionally ‘stay green’. The mutant lines also had higher seed weights and grain yields per plant than the parental line.

Key words: Photosynthesis, stay green, Triticum durum, yield.


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