不同氧气浓度在水培条件下对胡萝卜根发育的影响
毕业论文关键词：胡萝卜根；氧气浓度；木质素含量；通气组织
Effect of different Oxygen Concentration on the Development of Carrot Fleshy Root in Hydroponic
Abstract：Oxygen is necessary for plant growth, and hypoxia is considered to be one of the major abiotic stresses that inhibit plant growth and yield. However, the current hypoxia on the growth and development of carrots is not clear. In this experiment, the effects of different oxygen concentration [3mg / L (NAE, No air entering), 8mg / L (WAE, With air entering)] on the development of carrot root were studied under water culture. Impact. The results showed that the growth state of carrots was better than that of carrots under oxygen condition. It is found by microscopic observation that the root structure of the carrots grown under the oxygen condition is more intact; and when the oxygen is not supplied, the carrot roots produce a lot of dissolved tissue (ie, the cavity in the slice) for better transmission of oxygen The organizational structure of the root is destroyed. In the lignin content, the lignin content of the carrot root grown under the oxygen condition was lower than that of the carrot root grown under no oxygen.
Key words: carrot root；oxygen concentration；lignin content；aerenchyma
目 录
摘要1
关键词1
Abstract1
Key words1
引言1
1 材料与方法3
1.1 实验设计 3
1.2 测定项目 3
1.2.1生理指标的测定3
1.2.2木质素含量3
1.2.3组织化学染色3
1.3 数据分析4
2 结果与分析4
2.1 根系形态结构4
2.2 木质素含量5
2.3 显微结构观察5
3 讨论 6
3.1 不同氧气浓度对根形态的影响6
3.2 不同氧气浓度对木质素含量的影响6
3.3 不同氧气浓度对通气组织的影响7
致谢7
参考文献7
不同氧气浓度在水培条件下对胡萝卜根发育的影响
引言
胡萝卜，伞形科，一年或二年生草本植物，又有药性萝卜，丁香萝卜，红根，金笋之称[1]。在2000多年之前，人们已经开始对其进行种植，原产自中亚、西亚以及欧洲和非洲的北部。自13世纪末由伊朗传入，在国内已有600多年的栽培历史[2-4]。其栽培地分布十分广泛，南北均有。β-胡萝卜素是胡萝卜素的一种，并且胡萝卜中β-胡萝卜素的含量在所有蔬菜中首屈一指。β-胡萝卜素具有优良的抗氧化作用和营养强化作用，而且它还是文生素的A的前体，多吃胡萝卜，通过人体内酶的自动调控，能够安全地补充文生素A，避免了文A过量引起的中毒现象 [5]。并且胡萝卜还含有丰富的文生素C以及人体所必需的酶、氨基酸和矿质元素，能够预防白内障，降低心血管系列疾病的发病率。
胡萝卜自人工栽培以来，其生产面积逐年增长，产量和品质也在不断提高，在根菜类中，胡萝卜的产量和种植面积位居第2，仅次于萝卜[6]。因其特有的营养价值和优良的口感，在国内的市场需求量十分巨大，在蔬菜消费中占据着重要的地位。不仅如此，日本将胡萝卜称为五寸人参，韩国人也喜食胡萝卜，每年从夏季到初冬，我国都要出口大量的胡萝卜到以上两国，带来了巨大的经济效益。
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