TITLE:
Responses of Japanese Soybeans to Hypoxic Condition at Rhizosphere Were Different Depending upon Cultivars and Ambient Temperatures
AUTHORS:
Yutaka Jitsuyama
KEYWORDS:
Ambient Temperature; Converted Field from Paddy; Glycine max Merr.; Hydroponic Culture; Hypoxia; Low Oxygen; Wet Endurance
JOURNAL NAME:
American Journal of Plant Sciences,
Vol.4 No.6,
June
25,
2013
ABSTRACT:
To investigate
the soybean (Glycine max Merr.) wet
endurance, and the affect of the maturity and the ambient temperature to the
response, the plantlet in growth stage ranged from R1 to R2 of 8 Japanese
soybean cultivars which characterized as various wet endurance in a
past report were cultured under hypoxic-hydroponic condition for a month. Two
experiments at different periods differed significantly in temperature of air
and hydroponic solution, but the oxygenic condition were similar each
experiments, as aimed for. And also, control and hypoxia treatments
significantly differed in dissolved oxygenic concentration in each experiments.
The hypoxic condition at higher temperature induced the reduction of survival
of plantlet up to 70%. At higher temperature, the survival rate of late
maturity types “Yuzuru” and “Shirotsurunoko” were decreased
significantly in hypoxic condition than in control. Similarly, the shoot dry
matters of them were also decreased significantly in hypoxia at higher
temperature. The tendency of the decreasing in hypoxia was remarkable in the
pod dry matter, and the symptoms were shown also at the lower temperature. From
these results, soybean’s hypoxic tolerant may be reflected with the wet
endurance, the process of hypoxic damages can be divided to sudden death
symptom and biomass decreasing, and the mechanisms of hypoxic tolerance might
be affected strongly by ambient temperature, and absolutely controlled with the
genetic background.