Environmental Engineering Reference
In-Depth Information
Chapter 8
C
OMPARATIVE
S
TUDY OF
S
ALT
P
HYSIOLOGY FOR
S
OYBEAN
S
PECIES
:
O
SMOTIC AND
I
ONIC
S
TRESSES
Peng Chen
1,3,
#
, Xiaoli Tang
1,3,
#
,
Hongyan Wang
1,3
and Hong-Bo Shao
1,2,
1
Key Laboratory of Coastal Biology and Bioresources Utilization,
Yantai Institute of Coastal Zone Research (YIC),
Chinese Academy of Sciences (CAS), Yantai, China
2
Institute for Life Science, Qingdao University of Science and Technology (QUST),
Qingdao, China
3
The Graduate University of Chinese Academy of Sciences, Beijing, China
A
BSTRACT
Osmotic and ionic stresses were the primary and instant damage produced by salt
stress. Moreover, they can also bring about other secondary stresses. Soybean is an
important economic crop and the wild soybean is arousing increasing attention for its
excellent performance in salt resistance. It is because of this reason that we choose to
compare the different performances of
Glycine max
L. (ZH13) and
Glycine soja
L.
(BB52) in both young and mature seedlings, hoping to clarify the specific mechanism.
Our research revealed that compared to the cultivated soybean, the wild soybean was able
to maintain higher water potential, accumulate more amount of proline and glycine
betain, reduce the Na
+
and Cl
-
concentrations, cut down the efflux of the K
+
as well as
keep higher K
+
/Na
+
ratio. And what is more, almost all the excellent behaviors became
particularly obvious at higher NaCl concentration (300 mM). Therefore, according to all
the detections and comparisons, we concluded that the wild soybean possessed better
tolerance mechanisms and salt resistance. It is able to act as eminent germplasm resource
to enhance the resistant ability of cultivated soybean or even other crops.
Keywords:
Ionic stress, wild soybean, salt resistance, glycine betain, K
+
/Na
+
ratio
E-mail: shaohongbochu@126.com (HB SHAO); Tel.: +86-0532-84023984; Fax: +86-0532-84023984.
