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The peppers which were treated at ice-temperature for 6 hours and 1 mmol/L spermidine for 10 min, followed by cold storage (4℃ ± 1℃) respectively were investigated. The results indicated that the chilling injury was delayed and reduced by ice-temperature and spermidine treatments. Comparing with control group, ice-temperature and spermidine exerted significant effects on reduction of ascorbic acid (Vc) and chlororphyll contents, relatively high activity of superoxide dismutase (SOD), accumulation of malondialdehyde (MDA) as well as the increase of cell membrane penetrability. The results indicated that the spermidine and ice-temperature induced the activity of antioxidant enzyme SOD and maintained higher defence-related compound Vc as well as lower levels of membrane lipid peroxidation, which may be associated with chilling injury alleviation. There was a difference between ice-temperature treatment and spermidine treatment after 30 days. The results suggested that spermidine was more effective in reducing chilling sensitivity and prolonging storage of peppers.
Hybrid millet Zhang
and its parental cultivars were studied for their potassium (K) uptake and
accumulation characteristics and related physiological
mechanisms. Hydroponic culture was performed with two K levels (i.e., high and low) set up. At high K
level, hybrid millet showed heterobeltiosis in K accumulation and leaf K
content, and it also had higher H+-ATPase activity, respiration rate,
root oxidant activity and root K+ influx rate than its parental cultivars. All these lay the physiological
foundation of heterosis for potassium uptake of hybrid millet. At low K level,
the hybrid millet had a lower H+-ATPase activity and a higher K
efflux rate than its parental cultivars, thus heterobeltiosis in K accumulation
or leaf K content was not observed. Therefore, high level K fertilizer application
is recommended for hybrid millet cultivation as it is favorable for hybrid
millet to display heterosis in K uptake and K accumulation.