Water relation, photosynthetic ability and growth of thai jasmine rice (Oryza sativa L. ssp. indica cv. KDML 105) to salt stress by application of exogenous glycinebetaine and choline

  • Cha-Um S
  • Supaibulwatana K
  • Kirdmanee C
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Abstract

Rice reportedly possesses a very low capacity to accumulate
glycinebetaine (Glybet), but may be accumulated by the exogenous
application of Glybet or Choline (Cho) as ail alternative way to improve
its salt-tolerant ability. The aim of this research was to determine
whether Glybet accumulation could be induced in Thai jasmine rice by the
exogenous application of Glybet and Cho, and to determine the effects of
Glybet and Cho treatment on various growth parameters of seedlings
cultured under salt-stress conditions. Thai jasmine rice seeds were
aseptically germinated in vitro on solidified Murashige-Skoog media,
supplied with either Glybet or Cho in the culture media for 12 days and
then treated with 342 mm NaCl (salt stress) for 4 days. GlyBet content,
water relation, photosynthetic capabilities and growth characteristics
of salt-stressed seedlings were measured. The addition of Glybet or Cho
to plant culture media containing 342 mm NaCl resulted in increased
accumulation of Glybet in rice seedlings. Increased Glybet accumulation
was strongly associated with a high efficiency of water usage (r =
0.96), which in turn correlated with increased maximum quantum yield of
PSII (F(v)/F(m)) (r = 0.86). Moreover, the pigment concentrations of
seedlings cultured under salt stress were maintained by a function of
Glybet, led to high efficiency of photochemical and non-photochemical
quenching of PSII as well as to exhibit on net photosynthetic rate.
Thus, our results suggest that the addition of either Glybet or Cho to
the plant growth media can improve growth performance under salt stress
conditions by increasing the salt tolerance of Thai jasmine rice. The
exogenous application of Glybet and/or Cho to culture media may be an
effective method of improving resistance to salt stress via the
promotion of Glybet accumulation with in rice seedlings.

Author-supplied keywords

  • Chlorophyll a fluorescence
  • Glycinebetaine
  • Growth
  • Salt stress
  • Thai jasmine rice
  • Water use efficiency

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