Plant Molecular Biology

, Volume 33, Issue 4, pp 641–651

Cloning and characterization of tomato leaf senescence-related cDNAs

Authors

  • Isaac John
    • Department of Physiology and Environmental ScienceThe University of Nottingham
    • Biology DepartmentThe University of Michigan
  • Rachel Hackett
    • Department of Physiology and Environmental ScienceThe University of Nottingham
  • Wendy Cooper
    • Department of Physiology and Environmental ScienceThe University of Nottingham
    • National Institute of Agricultural Botany
  • Rachel Drake
    • Department of Physiology and Environmental ScienceThe University of Nottingham
    • Jealott's Hill Research StationZENECA Plant Science
  • Aldo Farrell
    • Department of Physiology and Environmental ScienceThe University of Nottingham
  • Don Grierson*
    • Department of Physiology and Environmental ScienceThe University of Nottingham
Article

DOI: 10.1023/A:1005746831643

Cite this article as:
John, I., Hackett, R., Cooper, W. et al. Plant Mol Biol (1997) 33: 641. doi:10.1023/A:1005746831643

Abstract

Senescence-related cDNA clones designated SENU1, 4, 5 (senescence up-regulated) and SEND32, 33, 34, 35 and 36 (senescence down-regulated) isolated from a tomato leaf cDNA library [9] were characterized. Southern analysis showed that SEND32 is encoded by a single-copy gene while SEND33, 34, 35, 36 and SENU1 and SENU5 are members of small gene families. DNA and protein database searches revealed that SEND32, SEND35, SENU1 and SENU5 are novel cDNAs of unknown function. SEND33 encodes ferredoxin, SEND34 encodes a photosystem II 10 kDa polypeptide and SEND36 encodes catalase. The SENU4 sequence is identical to the P6 tomato protein previously reported to be pathogenesis-related [46]. The mRNA levels of SENU1, 4 and 5 increased during leaf senescence and SENU1 and SENU5 were also expressed at high levels during leaf development and in other plant organs. The SENU4 mRNA was associated more specifically with leaf senescence, although low expression was also detected in green fruit. The mRNAs for all SEND clones decreased during tomato leaf development and senescence and all except SEND32 were expressed at low levels in other plant organs. The accumulation of mRNA homologous to SENU4 and the decrease in abundance of SEND32 provide good molecular markers for leaf senescence.

cDNA cloningenvironmental factorsgene expressionleaf senescenceorganstomato

Copyright information

© Kluwer Academic Publishers 1997