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继研究了夏季高温下不同根温处理对番茄植株生长和对叶片气孔的影响后,再深入研究不同根温处理对番茄叶片显微结构的影响。以番茄为试验材料,采用营养液循环栽培法,分别对根系进行(23±1)、(28±1)和(33±1)℃3个不同的根温处理,采用石蜡切片法对植株叶片的显微结构进行观察与测量。结果表明:随着根温的升高,处理植株的叶片厚度、栅栏组织厚度、海绵组织厚度均在减小;表皮厚度、栅栏组织/海绵组织的厚度比增大。因此,根温升高对植株构成了干旱胁迫,植株为了适应高温干旱的环境而改变了自身的结构特征。
After studying the effect of different root temperature treatments on tomato plant growth and leaf stomatal conductance under high temperature in summer, the effects of different root temperature treatments on the microstructure of tomato leaves were further studied. Tomato was used as experimental materials and three treatments of root temperature (23 ± 1), (28 ± 1) and (33 ± 1) ℃ were conducted by nutrient solution cycling cultivation method. The microstructure was observed and measured. The results showed that with the increase of root temperature, leaf thickness, palisade tissue thickness and sponge tissue thickness of treated plants decreased. Epidermal thickness and palisade / sponge tissue thickness ratio increased. Therefore, the root temperature increased plant drought stress, plants in order to adapt to high temperature and drought environment and changed its own structural characteristics.