| Budget Amount *help |
¥1,800,000 (Direct Cost: ¥1,800,000)
Fiscal Year 1990: ¥300,000 (Direct Cost: ¥300,000)
Fiscal Year 1989: ¥1,500,000 (Direct Cost: ¥1,500,000)
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| Research Abstract |
1. Seasonal change of net photosynthesis rate (Pn), transpiration rate (Tr) and stomatal conductance (Gs) in leaves of apples, Japanese pears, peaches and grapes were measured by ADC pontable system in field conditions. It was observed that Pn, Tr and Gs decreased immediately after chemical spray and recovered gradually within a few days.
2. Pn, Tr and Gs in leaves of apples and grapes decreased remarkably by spray of SADH. Especially in young leaves, severe decreases occurred and recovery required several days.
3. Pn, Tr and Gs in leaves of apples decreased slightly by spray of auxintype chemicals to control of preharvest fruit drop, but recovered within a short time.
4. Effect of dust, wettable powder and emulsion of a insecticide "Sumithion" on Pn, Tr and Gs in leaves of Japanese pear was compared. The emulsion induced most severe inhibition among the three chemicals, and the degree of inhibition of the dust was the least.
5. Fluorescence was observed in the stomatal portion of leaves immediately after dipping into a solution of wettable agent by a reflecting fluorescence microscope. In 24 hours after dipping, the fluorescence was observed in the cells of spongy and palisade tissue in the leaves.
6. Closure of stomata was observed immediately after dipping into the solution of chemicals by a scanning electron microscope. The closure became severe after dipping into higher concentrated solutions.
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