Plant stress physiology
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Plant Stress Physiology. 了解逆境等概念、植物抗性机理,从而为提高抗性增加产量服务。. 影响植物生长发育的各种环境因子示意图. 11.1 抗性生理通论. 11.1.1 逆境与植物的抗逆性 1、 逆境( environmental stress) 指对植物生长和发育不利的各种环境因素的总称,又简称胁迫( stress)。 逆境的种类是多种多样的,根据环境的种类,逆境可分为生物逆境( biotic stress) 和理化因素逆境又称非生物逆境( abiotic stress)( 图11.1 )。

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Plant Stress Physiology

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Plant Stress Physiology



11.1

11.1.1

1environmental stress(stress)(biotic stress)(abiotic stress)11.1

2(stress physiology)


11


3adaptability11.2

4stress escape

5stress resistance

6(stress avoidance)


8stress tolerance

9strain avoidance

10strain tolerancestrain reversibilitystrain repair


1-2


11adaptationC3CAM

12acclimationNaCl1%NaCl

13hardening


11.1.2

  • O2- OH 1O2 H2O2


11.1.3

  • ABA


1 (osmotic adjustment)

osmolyte / osmoticum /osmotic regulator/compatible solute

K+Na+

AA(1-2


1-2


2(stress proteins)

HSPs(Heat shock proteins)

CRP(Cold regulated proteins)

: osmotin: MW 26kD

(anaerobic peptides)

LEAs(late embryogenensis abundant proteins)


3

reactive oxygen species, ROSO2-OH, H2O2ROO-1O2

enzymatic and non-enzymatic

Antioxidants:

I

  • SODsuperocide dismutase)

  • CAT (Catalase)

  • POD (Ascorbic acid Peroxidase) or APX


1-3

(O2)(1O2)(O2-)(OH)(H2O)


ROS production under stress


  • II

    • Vit E

    • Vit C GSH

    • Mannitol et al.,


Antioxidant defense system pathways in plant cells


4 ABA

  • ABAABA(stress hormone)

  • ABA

    • ABA-dependent gene regulations


  • cross adaptation

  • ABA


Possible transduction route for ABA


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