分子生物学研究技能 | 关于植物激素研究那些事？Abscisic Acid (ABA)（建议收藏）

结合大家感兴趣的科研问题，接着给大家介绍植物激素。本期明星是脱落酸（Abscisic Acid (ABA)），也是最早研究的五种植物激素之一。结合相关资料一块学习下（敲黑板！！！）

Phytohormones – old timers and newcomers （5+4）

脱落酸（ABA）

ABA controls many plant processes including stress responses, development and reproduction

ABA is synthesized in the plastid and cytoplasm and is derived from zeaxanthin, a plant pigment

NCEDs are part of a large family, but only some are involved in ABA synthesis

Cluster of NCED genes thought to be involved in ABA synthesis

Some are primarily expressed in seeds, and others in vegetative tissues

Transporters enhance ABA movement across membranes

Other putative ABA transporters have been identified

Perception and Signaling

The PYR/RCAR ABA receptors made Science magazines Top 10 list

There are many genes encoding PYR/RCARs

Different PYR/RCARs affect ABA responses slightly differently

PYR/RCAR receptors bind ABA in a complex with ABI1 or other PP2Cs

ABA / PYR1 binding sequesters PP2C and permits SnRK2 activity

Thermal imaging can be used to monitor guard cell responses

Mutants impaired in ABA synthesis (aba2-13) or signaling (ost1-4) show reduced stomatal closure in response to a decrease in humidity, and so are cooler than wild-type plants

Francis Darwin recognized stomatal effects on leaf temperature (1904)

ABA signaling contributed to evolution of drought tolerance in land plants

Transcription factors are major targets of CDPKs and SnRK2s

ABA induces genes that protect cells from desiccation damage

ABA controls seed maturation, dormancy and desiccation

ABA - summary

Conclusions and future directions - Synthesis and Transport

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