Effects of CO2 concentration and irradiance on growth and photosynthesis of Juglans regia plantlets grown in vitro

Title:

Effects of CO2 concentration and irradiance on growth and photosynthesis of Juglans regia plantlets grown in vitro

Creator:

Sallanon, H., Dimon, B., Carrier, P., and Chagvardieff, P.

Identifier:

https://cdk.lib.cas.cz/client/handle/uuid:9e1c7585-3b1d-4a5c-82ab-b4ba83a4c50e
uuid:9e1c7585-3b1d-4a5c-82ab-b4ba83a4c50e
urnnbn:urn:nbn:cz:aba007-000fnr

Subject:

dark respiration, gross photosynthesis, leaf, mixotrophy, net photosynthesis, oxygen exchange, photorespiration, phosphoenolpyruvate carboxylase, ribulose-1,5-bisphosphate carboxylase, and shoot

Type:

model:internalpart and TEXT

Format:

print

Description:

Walnut (Juglans regia L.) plantlets were incubated during micropropagation in standard vessels (quasi confmed vessels) or in aerated vessels flushed with 360 or 20 000 cm^(C02) under irradiances of 70 (LI) and 250 (HI) pmol m"^ s'*. Plantlet morphology was strongly affected by the environment; leaf surface was increased, but shoot elongation and number of stems were reduced after increasing the irradiance of culture. Gross photosynthesis (Pq) capacity measured by using the •®02 isotope and mass-spectrometry techniques was increased by increasing photosynthetic photon flux (PPF) and CO2 concentration. Plantlets exhibited a potential for photorespiratory activity and Mehler-type reaction and a high rate of mitochondrial respiration in all vessel types and irradiances. When a long-term HI was applied, gas exchange rates (Pq and O2 uptake) were reduced in most of the vessel and PPF conditions, except in quasi confmed vessels. Under all the growth conditions, net photosynthetic rate (P^) was zero or slightly positive and the dry matter accumulation was very similar. Changes in O2 exchange, growth rate or enzyme activities linked to carbon fixation that were induced by changes in PFD and CO2 concentration showed that the photosynthetic characteristics of plantlets were typical for hetero-mixotrophic tissues.

Language:

Multiple languages

Rights:

http://creativecommons.org/licenses/by-nc-sa/4.0/
policy:public

Coverage:

241-249 and 83-91

Source:

Photosynthetica | 1995 Volume:31 | Number:2

Harvested from:

CDK

Metadata only:

false