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不同施氮量对烟苗生长发育和生理特征的影响 预览 被引量:1

Influences of Various Nitrogen Application Rates on Growth and Physiological Characteristics of Tobacco Seedlings
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摘要 为明确烟草漂浮育苗的适宜氮肥量,以烤烟"K326"品种为材料,研究了不同施氮量对烟苗生长发育和生理特征的影响。结果表明,较低的施氮量有利于烟苗细根数量增加和根系活性提高,从而增强根系吸收能力;同时,低施氮量也显著提高了与抗性相关的过氧化物酶(POD)、多酚氧化酶(PPO)和苯丙氨酸酶(PAL)活性,增强了烟苗对病原物的抵抗力。适宜的施氮量能显著提高烟苗叶片光合速率(Pn)、胞间CO2浓度(Ci)、蒸腾速率(Tr)和水分利用率(WUE)。因此,在烟草漂浮育苗过程中,施氮量以6~11 mg/株为宜,更有利于培育根系发达、抗病性强的健康烟苗。 This study investigated the influence of the application amounts of nitrogen on the growth and physiological characteristics of tobacco seedlings by studying flue-cured tobacco K326,the appropriate amount of nitrogen fertilizer needed for tobacco seedlings grown in floating beds was determined. Results showed that applying small amount of nitrogen increased the number of tobacco seedling roots and improved root activity,thus enhancing root adsorption. Moreover,it also significantly increased the activity of resistance-related peroxidase,polyphenol oxidase,and phenylalanine and reinforced the resistance of tobacco seedlings to pathogens. Applying appropriate amount of nitrogen could significantly increase the photosynthetic rate of tobacco seedling leaves,intercellular CO2 content,transpiration rate,and water use efficiency. The amount of nitrogen appropriate in the process of growing tobacco seedlings on a floating bed was 6 ~ 11 mg / plant,this nitrogen concentration was conducive to the growth of healthy tobacco seedlings with strong roots and resistance.
作者 江厚龙 徐宸 汪代斌 王红锋 杨超 李钠钾 耿莉娜 张均 JIANG Hou-long;XU Chen;WANG Dai-bin;WANG Hong-feng;YANG Chao;LI Na-jia;GENG Li-na;ZHANG Jun(1. Chongqing Tobacco Science Research Institute, Chongqing 400715, China; 2. Henan University of Science and Technology, Luoyang 471003, China)
出处 《江西农业学报》 CAS 2016年第7期63-67,共5页 Acta Agriculturae Jiangxi
基金 重庆市烟草专卖局项目“重庆中高海拔烟区揭膜时期及配套施肥技术研究”(NY201404041070014) “菜籽饼肥快速发酵工艺规程及产品质量标准研究”(NY2014040170016)
关键词 施氮量 烟苗 生长发育 生理特征 Nitrogen application Tobacco seedling Growth and development Physiological characteristics
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