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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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a:

b:


Photomorphogenesis

Skotomorphogenesis



1)

2

3UV-BB

50



1.

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

p2079-1


phytochrome


2.


3.

3.1

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

Pr - ( red light-absorbing form )

Pfr-( far-red light-absorbing form )


660 nm

730 nm


Pr

Pfr



3.2

5PHYA, PHYB, PHYC, PHYD, PHYE

I

PHYA PHYAmRNA

II PHYB, PHYC, PHYD, PHYE



Pr

Pfr

X

PfrX

3.3

PrPfr

PrPfrPr20 min-4 h


PfrPtotphotostationary equilibrium,

=[Pfr]/[Ptot]


1.


2.

(very low fluence response VLFR)

1100 nmol m-20.02


(low fluence responseLFR)

11000 mol/m2,-



high irradiance response HIR

100

/


Pr

Pfr

X

PfrX

X

X ?


blue-light response

/blue/UV-A receptor)cryptochromephototropin)


(phototropism)


(Inhibition of stem elongation)


(stomata movement)


(regulation of gene expression)


Callus induction and anthocyanin accumulation in Celosia cristata phumosa


WL RL BL Dark


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