论文部分内容阅读
以烤烟云烟87为材料,研究了不同光照强度(100%、88%、72%、62%自然光强)对苗期烤烟光合作用及干物质生产的影响.结果表明:烟苗在晴天中午100%自然光强下会产生光合抑制现象,适度遮光(88%自然光强)会消除光抑制,其日光合总量显著高于其他处理.遮光降低了烟苗光饱和点和光补偿点,增加了表观量子效率和弱光时的净光合速率,提高了叶绿素a和叶绿素b含量,降低了叶绿素a/b和类胡萝卜素含量.在88%自然光强下,烟苗具有较高的光饱和点和较低的光补偿点,对光照变化的适应性较强,其光合同化潜力有所提高.100%自然光强处理更有利于干物质和可溶性总糖向茎部转移,88%自然光强处理更有利于干物质和可溶性总糖向根部转移.在本试验条件下,苗期适当遮光(88%自然光强)可以提高烟苗的成苗素质.
The effects of different light intensities (100%, 88%, 72%, 62% of natural light intensity) on photosynthesis and dry matter production of flue-cured tobacco at seedling stage were studied using the flue-cured tobacco Yunyan 87. The results showed that: % Natural light will produce photosynthesis inhibition, moderate light (88% of natural light) will eliminate light inhibition, the total amount of photosynthesis was significantly higher than other treatments. Shading reduce light saturation point and light compensation point, increase Apparent quantum efficiency and net photosynthetic rate in low light increased the contents of chlorophyll a and chlorophyll b, and decreased the content of chlorophyll a / b and carotenoids. Under the natural light intensity of 88%, the seedlings had higher light saturation Point and lower light compensation point, strong adaptability to light changes, and its potential for photo-assimilation increased.100% natural light treatment is more conducive to dry matter and soluble total sugar to the stem transfer, 88% of natural Light treatment is more conducive to dry matter and total soluble sugar to the root transfer under the conditions of this experiment, the appropriate light-shielding seedling (88% of natural light) can improve seedling quality of tobacco seedlings.