chapter 8 Plant Hormone
chapter 8 Plant Hormone
平平 tare hormones The definition(定义) for plant hormone:an organIc(有机) compound synthesized(合 Fi) in one part of a plant and can be translocated(运输) to other parts, where in very low concentrations(浓度) it causes a physiological response
What are hormones? The definition (定义） for plant hormone: an organic （有机） compound synthesized（合 成） in one part of a plant and can be translocated （运输） to other parts, where in very low concentrations （浓度）it causes a physiological response
Six recognized groups of plant hormones HORMONE STRUCTURE PRECURSOR SoURCE MAJOR ROLES Abscisic Acid isopentenylmany seed deve opment pyrophosphate tissues dormancy (PP) stomata closure 脱落酸 甲瓦龙酸 Auxin COol chorismate shoot apex . cell elong ( tryptophan cell division precursor root initiation 生长素 H3ndn色氨酸 Brassinosteroids isopentenyl cell elongation and (Brassinolide pyrophosphate tissues divsion inhibit root growth 菜素内酯 甲瓦龙酸 Cytokinins pentenyl oot apical· cell division (zeatin) pyrophosphate meristems . shoot initiation release apical dominance 5 AMP and 细胞分裂素 甲瓦龙酸 Ethylene methionine truit opening ssues senescence TIrene 甲硫氨酸 aking 乙烯 Gibberellins isopentenyl seeds cell elongation and (GA3) division (IPP) buds and· germinati 赤霉素 甲瓦龙酸
油菜素内酯 脱落酸 生长素 细胞分裂素 乙烯 赤霉素 Six recognized groups of plant hormones 5‘AMP and 甲瓦龙酸 甲瓦龙酸 甲瓦龙酸 甲瓦龙酸 色氨酸 甲硫氨酸
Learning objectives Understand historical aspects related to the discovery of the five hormones Know the basic synthesis and degradation ofthese hormones Understand the action mechanism for hormone action Know examples ofhormone function in plants
Learning objectives Understand historical aspects related to the discovery of the five hormones Know the basic synthesis and degradation of these hormones Understand the action mechanism for hormone action Know examples of hormone function in plants
Auxin family AuxIn.Greek word auxin, means to ncrease) 9 Principle auxin in plants is indole-acetic acid (IAA) 9 Auxin family includes structural lIly similar inco看3欲ekld tchloroindole 3-acet acd 0AA (A COAL compounds( some are吲哚乙酸 4-氯-吲哚乙酸 synthetic) 的二t-ot-coo a Somewhat similar in 吲哚丁酸 hdele-3-butyric si their function Three natural auxins
Auxin family Three natural auxins Auxin : Greek word auxein, means to increase) 吲哚乙酸 吲哚丁酸 4-氯-吲哚乙酸