Agriculture Reference
In-Depth Information
Table 5.1
Polyamine metabolism in several cultivated species under water deficit-related
conditions
Plant species
Observed changes in Polyamine levels
Reference
Hordeum vulgare
Decreased Spd in four cultivars. Put and Spm
increased in three cultivars, but decreased in
another cultivar
Turner and Stewart
1986
Populus spp.
PAs decreased in sensitive, whereas PAs
increased in tolerant
Chen et al.
2002
Hordeum vulgare
Increased ADC transcripts level
Öztürk et al.
2002
Triticum aestivum
Increased Spd and Spm in tolerant genotype.
Increased Put in sensitive genotype
Liu et al.
2004
Triticum aestivum
Increased non-conjugated Spd in root
Liu et al.
2005
Oryza sativa
Increased Put, Spd and Spm
Yang et al.
2007
Populus przewalskii
Increased Pas
Lei
2008
Zea mays
Decreased S-adenosylmethionine decarboxylase
activity
Zhuang et al.
2008
Theobroma cacao
Increased ADC, SAMDC, SPDS, and SPMS
activities in roots. Increased ODC and
SAMDC activities in leaves
Bae et al.
2008
Vitis vinifera
Increased PAs
Antolín et al.
2008
Vetiveri a zizanioides
Decreased Put, increased Spd and Spm
Zhou and Yu
2010
Vitis vinifera
Increased PAs in tolerant genotype, whereas Pas
decreased in sensitive genotype
Toumi et al.
2010
Oryza sativa
Increased Spd and Spm associated with higher
tolerance
Basu et al.
2010
Solanum tuberosum
Increased Spm level, as well as ADC and
SAMDC activities
Evers et al.
2010
Capsicum annuum
Increased PAs in leaves. Decreased PAs in root
Sziderics et al.
2010
Vitis vinifera
Increased ADC and SPMS
Liu et al.
2011
Put accumulation and ADC activation occur under unfavorable conditions
(Bouchereau et al.
1999
). However, it has been often observed that drought stress
induces selective accumulation of Put in drought-sensitive plant species, whereas
in drought-tolerant ones, PAs metabolism shifts towards Spd and Spm synthesis.
When wheat (
Triticum aestivum)
plants were stressed with PEG 6000, increased
levels of free-Spd and free-Spm in leaves of a drought-tolerant cultivar were ob-
served, whereas free-Put titer buildup was noticed in a drought-sensitive cultivar of
that crop (Liu et al.
2004
). Yang et al. (
2007
) tested whether rice polyamines were
involved in drought resistance. Six rice cultivars differing in drought resistance
were subjected to well watered and water-stressed treatments during their repro-
ductive period. Water stress increased the activities of ADC, SAMDC, and Spd
synthase in the leaves, in consonance with rises observed in leaf Put, Spd and Spm.
The augmented contents of free Spd, free Spm, and insoluble-conjugated Put under
water stress were significantly correlated with cultivar yield. The authors concluded
that to have incremented levels of free Spd/free Spm and insoluble-conjugated Put,
as well as early accumulation of free PAs during drought is a desirable physiologi-
cal trait for rice during its adaptation to this stress. Basu et al. (
2010
) compared
