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Gas exchange in leaves of the root hemiparasitemelampyrum arvense L. before and after attachment to the host plant

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Biologia Plantarum

Abstract

Gas exchange characteristics of a hemiparasiteMelampyrum arvense L. before and after attachment to the hostCapsella bursa pastoris (L.) Med. were compared. The net photosynthetic rates (PN) on a leaf area basis were extremely low and in comparison to the value obtained for the host were about 15 % and 23 % for the unattached and attached hemiparasite, respectively. Also the concentration of photosynthetic pigments was low (as compared with the host the content of chlorophylls was about 33 % and 49 % and of carotenoids about 38 % and 36 % in the unattached and attached hemiparasite, respectively). On the other hand the rates of respiration were high (about 1.8 and 2.6 times higher in the unattached and attached hemiparasite, respectively, than in the host). In darkness stomatal conductance (gS) of the host and the unattached hemiparasite was rapidly reduced to 10 % of the value obtained in light, gS of the attached hemiparasite was decreased only by about 30%. A total reduction of gS occurred at relative water content (RWC) of 85 %, 75% and 45 % for the unattached hemiparasite, the host, and the attached hemiparasite, respectively. The transpiration (E) rate in the preparasitic stage was very low, being 2.6 and 4.5 times smaller than in the host and the attached hemiparasite, respectively. In the attached hemiparasite WUE was 7.5 and 3 times poorer than in the host and in the preparasitic stage, respectively.

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Abbreviations

Chl:

chlorophyll

d.m.:

dry mass

E:

transpiration rate

f.m.:

fresh mass

gs :

stomatal conductance to water vapour

I:

irradiance

PN :

net photosynthetic rate

PS 2:

photosystem 2

R:

respiration

Rubisco:

ribulose-l,5-bisphosphate carboxylase-oxygenase

RWC:

relative water content

WUE:

water use efficiency

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Lechowski, Z. Gas exchange in leaves of the root hemiparasitemelampyrum arvense L. before and after attachment to the host plant. Biol Plant 38, 85–93 (1996). https://doi.org/10.1007/BF02879641

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