早熟番茄苗期光合特性的研究

研究结果表明，早熟番茄苗期同一片真叶上不同部位侧生裂片的光合、蒸腾速度不同，其大小依次为中部〉顶部〉基部，叶温和气孔阻力正好相反。４个早熟品种净光合速率表现为秦粉２号〉西粉３号〉秦粉５号〉早丰，蒸腾速率为早丰〉秦粉２号〉秦粉５号西粉３号。秦粉２号、西粉３号两品种光合速率及品变化为单峰型，无午休现象，其日变化趋势与有效光强变化平行或一致。

Photosynthetic Characteristics of Early maturing Tomato in Seedling Stage

The results of this research showed that photosynthetic rate and transpiration rate of different parts of the same foliage of early-maturing tomato seedling are different,the rate is high in the middle part,moderate in the tip and lower in the base part,but the leaf temperature and stomatal resistance is on the contrary.Photosynthetic characteristics of four early-maturing varieties have also differences.In the same environmental conditions,the daily changes of photosynthesis and transpiration of two early-maturing varieties tomato seedling are single peak curve,no noon break.The trend of daily changes is identical with the trend of photosynthetically active radiation change,which indicated that light intensity is primary fact or affecting its daily changes.