关键词: 柑橘, 幼苗, 微量元素, 症状, 光合特性, 诊断, 结球甘蓝, 抗病, 抗逆, 遗传育种

Abstract: To ascertain the symptoms，photosynthetic characteristics and nutrient status of‘Nanfeng’ tangerine under Fe，Mn，Zn deficiency，pot experiment was conducted. The results showed that，after 210 d of Fe deficiency treatment，yellow-green interveinal chlorosis symptom was observed，but the veins are still green in the primary new leaves of‘Nanfeng’tangerine，while the secondary new leaves were primrose yellow，even the new leaves and veins were white，and the secondary new leaves become small and narrow. After 210 d of Mn deficiency treatment，convex and concave leaf with yellow colour appeared in the primary new leaves，while the secondary new leaf veins are green reticulate and interveinal chlorosis，even some leaves show brown spots. In the Zn deficiency treatment，yellow spots were found in primary new leaves，and these spots become bigger and irregular yellow areas were appeared in the end of this experiment，while the whole secondary new leaves were yellowing with a lot of yellow spots，and the rosetting leaves were small and narrow. Photosynthetic pigment was decreased significantly under Fe，Mn，Zn deficiency treatments，but the decreasing amplitude was Fe > Mn > Zn. Photosynthesis of both old leaves and primary new leaves were inhibited by Fe deficiency，but only in primary new leaves under Mn，Zn deficiency conditions. Fe，Mn，Zn deficiency treatments significantly influenced not only the Fe，Mn，Zn concentration，but also other mineral nutrient concentrations of‘Nanfeng’tangerine.

Key words: citrus；seedling, micronutrient, symptom, photosynthetic characteristics, diagnosis, cabbage, disease resistance, stress resistance, genetics and breeding