Articles
HIGH TEMPERATURE AND DROUGHT STRESS SUPPRESS THE PHOTOSYNTHESIS AND CARBOHYDRATE ACCUMULATION IN ‘SATOHNISHIKI’ SWEET CHERRY
Article number
618_43
Pages
371 – 377
Language
English
Abstract
Effects of air temperature and soil moisture level on the photosynthesis and carbohydrate accumulation in Satohnishiki sweet cherry were studied.
Trees were grown under moist [soil moisture tension (SMT) <6 kPa] and dry (SMT <40 kPa) conditions in sunlit growth chambers controlled at 25/15 °C and 35/25 °C from early July to mid-September.
Leaf photosynthetic rates under moist soil conditions were considerably higher than those under dry soil conditions throughout the experimental period.
Under both soil conditions, low temperatures slightly increased the photosynthetic rate compared to high temperatures.
Both high temperatures and dry soil conditions accelerated leaf abscission, and considerably reduced the dry weight of the trees harvested in winter.
Starch concentration of the trees grown under low temperature conditions and high temperature/wet soil conditions was higher than that under high temperature/dry soil condition.
These results revealed that high temperature combined with dry soil moisture in summer reduces the photosynthetic activity, and results in decreasing the carbohydrate accumulation.
However, it is also indicated that even at high temperatures, if the trees are irrigated sufficiently, photosynthetic rate is relatively high and nonstructural carbohydrate concentration is almost the same level as that at low temperatures.
Trees were grown under moist [soil moisture tension (SMT) <6 kPa] and dry (SMT <40 kPa) conditions in sunlit growth chambers controlled at 25/15 °C and 35/25 °C from early July to mid-September.
Leaf photosynthetic rates under moist soil conditions were considerably higher than those under dry soil conditions throughout the experimental period.
Under both soil conditions, low temperatures slightly increased the photosynthetic rate compared to high temperatures.
Both high temperatures and dry soil conditions accelerated leaf abscission, and considerably reduced the dry weight of the trees harvested in winter.
Starch concentration of the trees grown under low temperature conditions and high temperature/wet soil conditions was higher than that under high temperature/dry soil condition.
These results revealed that high temperature combined with dry soil moisture in summer reduces the photosynthetic activity, and results in decreasing the carbohydrate accumulation.
However, it is also indicated that even at high temperatures, if the trees are irrigated sufficiently, photosynthetic rate is relatively high and nonstructural carbohydrate concentration is almost the same level as that at low temperatures.
Authors
K. Beppu, T. Suehara, I. Kataoka
Keywords
Prunus avium, controlled temperature, water stress, assimilation, nonstructural carbohydrate
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