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Over-expression of PttEXPA8 gene showed various resistances to diverse stresses.

Abstract：

:Expansins play a pivotal role in plant adaptation to environmental stress via cell wall loosening. To evaluate the roles of expansin in response to different environmental stress conditions, the expansin gene PttEXPA8 from Populus tomentosa was transformed into tobacco. Analysis of physiological indices demonstrated the transgenic plants with improved resistance to heat, drought, salt, cold, and cadmium stress but to different extents. In mature plants, PttEXPA8 exerted the greatest effect on heat stress, with a response index value of 137.46%, followed by drought, cadmium, cold, and salt stress with response index values of 101.04%, 70.61%, 69.95%, and 54.68%, respectively. Over-expression of PttEXPA8 resulted in differential responses in physiological indices to the stresses. Soluble sugar content showed the highest response to the stresses, with an average response index value of 29.29%, whereas the absolute response index value for malondialdehyde content, relative electrolyte leakage, chlorophyll content, and superoxide dismutase activity ranged from 11.01% to 19.21%. The present results provide insight into the roles of expansin in stress resistance in Populus.

journal_name

Int J Biol Macromol

journal_title

International journal of biological macromolecules

authors

Zhang H,Liu H,Yang R,Xu X,Liu X,Xu J

doi

10.1016/j.ijbiomac.2019.02.115

subject

Has Abstract

pub_date

2019-06-01 00:00:00

pages

50-57

eissn

0141-8130

issn

1879-0003

pii

S0141-8130(18)34173-4

journal_volume

130

pub_type

杂志文章

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