摘要:棉株作为一个统一的生物个体,在研究高温胁迫时很难将高温对源能力和库能力的影响分离开来。因此,设计一种使用化学试剂对叶柄进行阻断的实验技术,在棉花抗高温研究中具有重要的意义。本试验于20XX年在江苏南京试验点进行,选用三氯乙酸作为阻断剂,设置不同浓度(5%、10%、15%、20%、25%、30%),分别于上午9时和傍晚18时左右进行涂抹处理,取样后观察并测定SPAD值及净光合速率,确定最适浓度和最佳处理时间。通过对花后15天棉铃对位叶韧皮部进行最优实验条件下的阻断处理后,分析相关物质含量变化,明确该条件下对韧皮部运输的阻断效果。数据显示,用15%的TCA于傍晚18:00左右处理阻断效果最佳。韧皮部阻断后,棉铃对位叶的蔗糖、淀粉含量显著升高,且日变化幅度显著降低。该结果表明,三氯乙酸有效地阻断了棉铃对位叶光合产物的输出,该化学阻断方法可以应用于棉花的抗高温研究。26199
毕业论文关键词:棉铃对位叶;三氯乙酸;最适浓度;最佳处理时间;光合产物输出
Effects of Trichloroacetic Acid on the Photosynthate Export from the Subtending Leaf of Ball
Abstract: Cotton is a unified organism, and it is hard to study the effect of high temperature on the ability to source and library separately. Therefore, figuring out a technique which uses chemical reagent to block petioles has great significance in the study of cotton resistance to high temperature. This study is conducted in the research site of Nanjing Agricultural University in 2016. We choose trichloroacetic acid as a blocker and set different concentrations.Then we smear it on petioles at 9 am and 6 pm respectively. After observing and measuring the sample,we determine the optimum concentration and the best processing time. Then we block the phloem of subtending leaf of cotton balls which are 15 days after flowering under the optimal condition. By analyzing the changes of sugar content, we clear the blocking effect under the condition. The data shows that treating with 15% TCA around 6 pm is best. After blocking, the soluble sugar content of the subtending leaf significantly increased and the daily changing range decreased dramaticlly. According to the test results, trichloroacetic acid block the photosynthate export from the subtending leaf of ball effectively,and it can be applied in the study of cotton resistance to high temperature.
Key words: subtending leaf of cotton boll;trichloroacetic acid;optimal concentration;the best processing time;photosynthate export
目 录
摘要1
关键词1
Abstract1
Key words1
引言1
1 材料与方法2
1.1 试验设计 2
1.2 测定内容及方法 3
1.2.1 净光合速率和SPAD值的测定3
1.2.2 棉铃对位叶中蔗糖和淀粉含量的测定3
1.2.3 13C丰度的测定3
1.2.4 数据处理与分析3
2 结果与分析3
2.1 阻断效果随阻断处理时长的变化3
2.2 最佳处理时机的确定4
2.3 三氯乙酸对棉铃对位叶糖代谢的影响5
2.3.1 三氯乙酸对棉铃对位叶外观的影响5
2.3.2 三氯乙酸对棉铃对位叶蔗糖含量的影响6
2.3.3 三氯乙酸对棉铃对位叶淀粉含量的影响6
2.3.4 三氯乙酸对棉铃对位叶糖代谢的影响7
2.4 韧皮部阻断处理的阻断效率8
2.4.1 叶片淀粉含量日变化表征阻断效率8
2.4.2 运用同位素标记表征阻断效率8
3 讨论9
致谢10
参考文献10
三氯乙酸对棉铃对位叶光合产物输出的影响研究
尽管棉花起源于热带干旱地区、性喜温,但因棉花品质形成关键期为一年中最热的季节,因此生产上仍常受高温胁迫的影响,已有研究表明高温胁迫易导致棉花产量品质下降。随着温室化效应的日趋加剧,极端气候,特别是夏季高温,发生将更为频繁,夏季高温胁迫必将成为我国各地区棉花生产上最为严重的自然灾害之一。 三氯乙酸对棉铃对位叶光合产物输出的影响研究:http://www.youerw.com/shengwu/lunwen_20297.html