Northeast China is the major soybean production area in China where the growth period traits, such as the days from
sowing to maturity, are the major ecological traits varying from region to
region. The maturity group (MG) system of the soybeans was firstly established
in the US and then accepted internationally to characterize the cultivars for
exchanging materials and planning breeding schedules.
Source: Baidu
In this research, a collection of soybean varieties composed of 361 landraces
and released cultivars used in soybean production during the historical decades
were tested with a group of American and domestic MG standard checks (MG000-MG
III) at nine regions in Northeast China in 2011-2012 in order to establish a
local MG grouping system and determine the MGs of the local varieties in
Northeast China.
The grouping procedure was as the following. At each location each year, the
class limits of a MG were determined as the average days to maturity plus and
minus half distance between the neighboring two MGs.
All the MGs limit at all
locations in all years were accordingly determined. Then the MG for each
variety at each environment was nominated and finally the MG for each variety
was determined according to its most counts among locations and years.
Here we used the days from sowing to maturity (R8) to group MGs which has been
the international usual way rather than the others such as days from emergence
to R7, because after the seeds sown in the soil, they start water absorption
and metabolism in early spring and days from R7 to R8 were different among the
varieties in Northeast China.
The results obtained were as follows:
(1) The MG class limits for various locations/sub-regions were determined and
the best locations for each MG were nominated, such as Beian and Zhalantun for
MG000 and MG00, Keshan and Mudanjiang for MG0 and MG I, Tieling for MG II and
MG III;
(2) The 361 Northeast spring soybean varieties were classified into six groups,
MG000-MGIII, respectively;
(3) The distribution of the various MGs in sub-regions in Northeast China was
revealed, such as MG000-MG00 mainly in Northern Heilongjiang and Northern Inner
Mongolia, MG0-MG I mainly in Central and Southern Heilongjiang Province, MG II
mainly in Jilin Province, and MG III mainly in Liaoning Province;
(4) A number of the local MG standard checks in Northeast China were nominated
for local utilization;
(5) A local MG grouping procedure in Northeast China was suggested, the first
step to assign an introduction with a preliminary MG through comparison with
MG-known varieties and then test and determine its MG at the best locations for
MG testing.
This article comes from Seed China News 1606, CCM
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Tag: soybean