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第二节 光对植物生长的影响 PowerPoint PPT Presentation


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第二节 光对植物生长的影响. 在影响植物生长发育的诸多环境因素中,以 “ 光 ” 的影响为最大。 光对植物的生长发育的影响表现在两个方面: a: 影响植物的光合作用 b: 调节植物的生长发育. Photomorphogenesis 光形态建成 “光”控制细胞的分化、结构和功能的改变,最终导致组织和器官的建成。 Skotomorphogenesis 暗形态建成 黄化现象即幼苗在黑暗条件下表现出茎细长、顶端呈钩壮弯曲,叶片小而呈黄白色。 暗形态建成的原因是因为在缺乏光的条件下,大部分基因得不到表达。.

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第二节 光对植物生长的影响

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4799904

a:

b:


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Photomorphogenesis

Skotomorphogenesis


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1)

2

3UV-BB

50


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1.

(red light, 650-680 nm, R)(far-red light, 710-740 nm, FR)()

p2079-1


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phytochrome


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2.


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3.

3.1

(Phytochrome)250 kD2(chromophore phytochromobilin )(apoprotein )(holoprotein )

Pr - ( red light-absorbing form )

Pfr-( far-red light-absorbing form )


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660 nm

730 nm


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Pr

Pfr


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3.2

5PHYA, PHYB, PHYC, PHYD, PHYE

I

PHYA PHYAmRNA

II PHYB, PHYC, PHYD, PHYE


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Pr

Pfr

X

PfrX

3.3

PrPfr

PrPfrPr20 min-4 h


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PfrPtotphotostationary equilibrium,

=[Pfr]/[Ptot]


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1.


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2.

(very low fluence response VLFR)

1100 nmol m-20.02


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(low fluence responseLFR)

11000 mol/m2,-


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high irradiance response HIR

100

/


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Pr

Pfr

X

PfrX

X

X ?


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blue-light response

/blue/UV-A receptor)cryptochromephototropin)


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(phototropism)


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(Inhibition of stem elongation)


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(stomata movement)


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(regulation of gene expression)


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Callus induction and anthocyanin accumulation in Celosia cristata phumosa


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WL RL BL Dark


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