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

Plant Stress Physiology


Plant stress physiology


Plant stress physiology

11.1

11.1.1

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

2(stress physiology)


Plant stress physiology

11


Plant stress physiology

3adaptability11.2

4stress escape

5stress resistance

6(stress avoidance)


Plant stress physiology

8stress tolerance

9strain avoidance

10strain tolerancestrain reversibilitystrain repair


Plant stress physiology

1-2


Plant stress physiology

11adaptationC3CAM

12acclimationNaCl1%NaCl

13hardening


11 1 2

11.1.2

  • O2- OH 1O2 H2O2


11 1 3

11.1.3

  • ABA


Plant stress physiology

1 (osmotic adjustment)

osmolyte / osmoticum /osmotic regulator/compatible solute

K+Na+

AA(1-2


Plant stress physiology

1-2


Plant stress physiology

2(stress proteins)

HSPs(Heat shock proteins)

CRP(Cold regulated proteins)

: osmotin: MW 26kD

(anaerobic peptides)

LEAs(late embryogenensis abundant proteins)


Plant stress physiology

3

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

enzymatic and non-enzymatic

Antioxidants:

I

  • SODsuperocide dismutase)

  • CAT (Catalase)

  • POD (Ascorbic acid Peroxidase) or APX


Plant stress physiology

1-3

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


Plant stress physiology

ROS production under stress


Plant stress physiology

  • II

    • Vit E

    • Vit C GSH

    • Mannitol et al.,


Plant stress physiology

Antioxidant defense system pathways in plant cells


Plant stress physiology

4 ABA

  • ABAABA(stress hormone)

  • ABA

    • ABA-dependent gene regulations


Plant stress physiology

  • cross adaptation

  • ABA


Plant stress physiology

Possible transduction route for ABA


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