The incidence and the disease index of alfalfa powdery mildew with 75kg/hm2 were lower than those of 45kg/hm2 and 105kg/hm2.The variation of some biochemical index of alfalfa cultivars such as the content of chlorophyll, the activity of peroxidase (POD) and activity of phenylalnine ammonia-lysae were analyzed by testing alfalfa seedling whose leaves have been inoculated and uninoculated.
T3 had the lowest content of photosynthetic pigment; T1 and T2 did not differ from CK in the content of chlorophyll and carotenoid.
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The ratio of chlorophyll a to b in the four groups ranged from 2.04 to 2.69 and the ratio of chlorophyll to carotenoid from 3.08 to 4.51.
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Net photosynthetic rate was not significantly related to the contents of chlorophyll and carotenoid, the ratio of chlorophyll to carotenoid, relative air humidity and intercellular CO2 concentration.
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Effects of different concentrations of nitrogen and phosphorus on chlorophyll biosynthesis, chlorophyll a fluorescence, and photosynthesis in Larix olgensis seedlings
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The effects of nitrogen and phosphorus supply on chlorophyll biosynthesis, total nitrogen content, and photosynthetic rate were studied.
The result of the present investigation shows that the sudden wilting or death of the Rose geranium in summer in South China is mainly due to the mechanical injury fo its root system from the storms prevailing at this season. The water balance of the plant is then destroyed, its leaves are severely wilted and death may follow. In addition, the growth of the plant is also inhibited by the higher temperature, with the increase of ultra-violet rays in summer, the chlorophyll content of the leaves decreas...
Surface sterilized wheat leaf segments infected with rusts (chiefly P. triticina) were found to be capable of producing large amounts of uredospores in complete darkness when sufficient nutrients were furnished. Sporulation continued for 40-50 days in culture and finally some rust mycelia were found to extend from within the leaf segments on to surrounding media. It was proved through TTC staining, plasmolysis test and microscopic examination that host tissues remained alive only for about 10 days. These ob...
Field and laboratory tests were conducted during 1980~1982 to eva- lute the compensation of rice plants to larval damage by the rice leaffol- der,Cnaphalocrocis medinalis(Guene'e),the rice variety used being 68~11。 The results indicated that rice plants have the ability to compensate for flag leaf damage by increasing the area and photosynthesis rates of the second leaf (next to flag leaf),when the flag leaf damaged over 50±5%,there was no significant yield reduction,but when the damage reached over 90%,the...