PHOTOSYNTHESIS OF THE RICE PLANT UNDER WATER STRESS
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概要
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Leaf-resistance values sharply decreased after sunrise, remained low during daytime, and increased sharply toward sunset. This general pattern was modified by weather conditinos and soil-water stress. On a cloudy day, leaf resistance remained low (3-5 s/cm) during daytime regardless of the soil-water regime. No increase in leaf resistance equaivalent to "midday closure of stomates" was observed under flooded conditions on a sunny day. Under water stress and on a sunny day, leaf resistance began to increase in the morning or afternoon, depending on the degree of water stress. Both the light intensity at which the leaf photosynthetic rate reached light-saturation and the maximum value of the photosynthetic rate became lower as water stress became more severe. A simulation model revealed that crop photosynthesis was almost identical (17-18 g・m^<-2>・day^<-1>) for both water-stressed and well-watered crops on a cloudy day when solar radiation was 200 cal・cm^<-2>・day^<-1>. On a sunny day, when solar radiation was 600 cal・cm^<-2>・day^<-1>, however, crop photosynthesis under water stress reached its maximum at about 8 a.m., after which it declined with time and became almost zero after 12 noon. Under flooded conditions, diurnal changes in crop photosynthesis were similar to those of incident solar radiation. As a result, crop photosynthesis was about 33 g・m^<-2>・day^<-1> under flooded conditions and only about 10 g・m^<-2>・day^<-1> under water stress. Thus, crop photosynthesis under water stress was greater by 70% on a cloudy day than on a sunny day. This suggests that a partly shaded environment favors crop growth under water stress.
- 社団法人日本土壌肥料学会の論文
著者
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Yoshida Shouichi
The International Rice Research Institute
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SHIOYA Michi
The International Rice Research Institute
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Yoshida Shouichi
The Internationa Rice Research Institute
関連論文
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- EFFECTS OF TEMPERATURE ON GROWTH OF THE RICE PLANT (Oryza sativa L.) IN A CONTROLLED ENVIRONMENT
- EFFECTS OF AIR TEMPERATURE AND LIGHT ON GRAIN FILLING OF AN INDICA AND A JAPONICA RICE (Oryza sativa L.) UNDER CONTROLLED ENVIRONMENTAL CONDITIONS
- NITROGEN NUTRITION, LEAF RESISTANCE, AND LEAF PHOTOSYNTHETIC RATE OF THE RICE PLANT
- PHOTOSYNTHESIS OF THE RICE PLANT UNDER WATER STRESS
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- EFFECTS OF MINERAL NUTRITION ON TILLERING OF RICE
- WATER UPTAKE BY DRYLAND RICE ROOT SYSTEM DURING SOIL DRYING CYCLE
- EFFECTS OF NITROGEN, PHOSPHORUS, AND POTASSIUM ON PHOTOPHOSPHORYLATION IN RICE IN RELATION TO THE PHOTOSYNTHETIC RATE OF SINGLE LEAVES
- AN ASSESSMENT OF THE EFFECTS OF SILICATE APPLICATION ON RICE BY A SIMULATION METHOD
- EFFECTS OF DIFFERENT METHODS OF ZINC APPLICATION ON GROWTH AND YIELDS OF RICE IN A CALCAREOUS SOIL, WEST PAKISTAN
- PARTIAL REPLACEMENT OF POTASSIUM BY SODIUM IN THE RICE PLANT UNDER WEAKLY SALINE CONDITIONS
- EFFECTS OF CO_2 ENRICHMENT AT DIFFERENT STAGES OF PANICLE DEVELOPMENT ON YIELD COMPONENTS AND YIELD OF RICE (Oryza sativa L.)