Positive regulatory role of strigolactone in plant responses to drought and salt stress

These results indicate that cross-talk between SL and abscisic acid plays an important role in integrating stress signals to regulate stomatal development and function

C. V. Ha

2013

Scholarcy highlights

  • Chien Van Haa,b, Marco Antonio Leyva-Gonz√°lezc,1, Yuriko Osakabed, Uyen Thi Trana, Rie Nishiyamaa, Yasuko Watanabea, Maho Tanakae, Motoaki Sekie, Shinjiro Yamaguchif, Nguyen Van Dongb, Kazuko Yamaguchi-Shinozakig, Kazuo Shinozakid, Luis Herrera-Estrellac,2, and Lam-Son Phan Trana,2
  • By using different molecular and physiological approaches, we provide compelling evidence that, in Arabidopsis, SL acts as positive regulator of plant responses to drought and salt stress, which was associated with shoot- rather than root-related traits
  • Two independent lines from each of the SL-biosynthetic max3 and max4 mutants, as well as the SL-signaling max2 mutant, were subjected to a drought tolerance assay in which water was withheld from 3-wk-old plants growing in soil
  • Considerable research has been carried out in the past 20 y to elucidate the functional role of various hormones in plant responses to environmental stress and the molecular events involved in hormone-mediated adaptation to abiotic stress
  • S1 and S2), implicating the involvement of SL as a positive regulator in abiotic stress responses. This premise was further supported by the rescue of the drought-sensitive phenotype of SL-deficient max3 and max4 mutants but not of the SL-response max2 mutant, and the enhancement of drought tolerance of WT plants by exogenous application of SL to the plants
  • No significant differences in root growth were observed in nutrient medium grown mutant and WT plants subjected to salinity and osmotic stress treatments
  • It is worthy to note that no remarkable change in shoot branching phenotype of the WT plants was observed during exogenous SL treatment, which is in agreement with previous findings
  • A large portion of the identified SL signaling-mediated photosynthesis- and flavonoid biosynthesis-related genes were down- and up-regulated, respectively, by dehydration in an abscisic acid-independent mechanism, suggesting that SL controls stress response in an ABA-dependent

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