Physiological and biochemical influences of plant growth regulators(6-BA and GA3) on red-stem Dendrobium officinale seedlings under salt stress were performed. The results showed that low concentration of 6-BA and GA3 remarkably increased stem growth rate of red-stem D. officinale under salt stress, but reduced root growth rate. And GA3 had more effects than 6-BA in root growth rate. With the increase of 6-BA concentration, the chlorophyll contents in leaves of red-stem D. officinale displayed a high-low trend, and the carotenoid contents displayed a low-high-low trend, while high concentration of GA3 increased the contents of chlorophyll and carotenoid; Low concentration of 6-BA increased the content of soluble sugar in leaves of red-stem D. officinale under salt stress, while other concentrations of 6-BA and GA3 reduced the contents of soluble sugar. The results revealed that treatments of appropriate concentrations of exogenous plant hormones can protect the seedlings of red-stem D. officinale from hurt caused by salt stress by improving the photosynthetic pigment synthesis and soluble sugar accumulation.
QIN Jie-ming
,
HE Han-jie
,
ZHANG Dang-quan
,
CHEN Li-li
,
LIU Huan
. Physiological and Biochemical Influences of 6-BA and GA3 on Red-stem Dendrobium officinale under Salt Stress[J]. Subtropical Plant Science, 2016
, 45(01)
: 27
-31
.
DOI: 10.3969/j.issn.1009-7791.2016.01.006
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